http://www.overboost.com/story.asp?id=1190 browsing overboost noticed this article anyone have any kwoledge/experience on these plugs?

Yea I have denso Iridium sparkplugs in my Eclipse....they have a thinner electroid....and they produce a hotter and more constant spark.....they also last alot longer then normal plugs....most of the time you will see a increase in performance....more like you will accelarate faster....and of course you dont gap these plugs because the cylinoid is so thin...i love and I am sold on them....Denso plugs are around 25 to 30 dollars a plug....yes they are exspensive but they are worth it

http://www.cabeperformance.com/detail.asp?SKU=denso1

cabe toyota under the scion section! hmmm but has anyone tryed them? 25 doesnt seem too bad for performance plugs.

okay NOT under the scion section my bad. :oops:

There are so many different one. Does anyone know which one to use?

http://search.ebay.com/search/search.dll?query=DENSO+plugs&sosortorder=2&ht=1&sosortproperty=3&from=R10&BasicSearch=

sometimes you can find them as little as 15

Those plugs are the bomb!!!!! They cost a lot!! :? , but they work great! Once installed your idle is smoother and your motor revs up better, plus last longer! I used to stock them but they got too dam expensive.

i got denso iridium IK-16 on my accord...those plugs ROCK!!!!!
i got mine for $60 for 6...$10 each is not too bad...

I currently use NGK R's in my N20 fed Odyssey....but want to do iridium. I hear they are nice and work well. we'll see.

those plugs are not worth it if you are just looking for a little boost in power. they will be better for someone that is going for big power gains.

I think they are overpriced and overrated. I burned through mine pretty quick (on other cars). There's no worthy replacement for stock NGK's!!! Unless you've done some radical modifications, there is no need to use a different type of spark plug.

This is what a very reputable performance shop in OC told me...

Denso iridium plug are very nice, last long time, but also expensive. They retail from $25 to $30 each and you need 4 for the xB ($100~$120)
These plugs are not bullet proof and it will loose its performance through time (like all other plugs) since most people spend lots money on them and think they last forever, people tend to keep use them even it start to perform like crap
If you are a rich racer, yeah use them as long as you can afford it

But for most of us, its best to use some high performance plug like Bosh or NGK ($6 each), and change them constantly. The performance of the plugs will always at its peek and it will out perform the expensive Denso iridium through time.

if you are a HARD driver these plugs will last you a year then you need to replace them, the technical book shows that these plugs will last for 60,000 Miles under NORMAL driving conditions. If you drive hard then these plugs will cost you a prety penny every year, just use the regular denso and be happy. :D The regular denso's don't cost as much and are OEM on our rides.

toyota puts iridium tipped spark plugs in all the cars they make at the factory. the factory plugs are from Nippon-Denso, which Toyota owns. that's why all the cars on the lot can go 100K miles w/out new plugs.

100k miles w/o changing plugs??? that seems a bit over the top to me, but I've also never kept the same plugs on a car for more than about 20k miles (once a year change).. so are the low end Denso plugs tipped or no?

i'm not sure what the difference between the low end plugs, factory plugs, and upgraded plugs is. but as a former salesmen one of the things we were taught is that in conjunction w/ no distributor, spark plug wires, and the iridium plugs you could go 100K miles without changing them.

i wouldn't cause i'm use to changing them every couple of months, just like i can't wait 5K miles to change my oil no matter what the factory says.

The misinformation is flying in this thread!

Your ignition system is designed for a particular type of plug, which is the factory recommended plug. If you wish to use a different type of plug, you have to modify the ignition system to suit.

Changing the electrode configuration changes the way the plug responds to voltage, which in turn can upset the timing of the engine. If you take an engine that is designed for fat electrode conventional plugs and replace those plugs with thin electrod plugs you have effectively lowered the firing voltage and the energy delivered by the plug during firing. This is exactly what you _don't_ want to do!

If the ignition system is designed for thin electrode plugs, they can work great, but they aren't a magic bullet for all cars.

You will see testimonials saying "I installed these plugs and got 10HP/smoother idle/easier starting/better love life/etc. Usually, what has happened is that the person has removed worn out conventional plugs and replaced them with new whiz-bang plugs, taking the ignition from 50% function to 75% function. He would have done even better if he had replaced his tired conventional plugs with new conventional plugs! :)

George

Well said George!

That is why the shop I mentioned before recommended me to use factory plug and replce them more often than buy iridium plug and use them forever.

heck pull out your old plugs and they say denso right on them. I wouldn't doubt if there were already platnum or iridium. 8)

So George, are you saying that I shouldn't install the Denso Iridium Power, U groove tapered cut plugs that I just bought (#IK16's)? And that my Factory Denso plugs should perform better since my engine is tuned for them?

I have 7,500 miles on my box so far. Since they are both denso brand, maybe I can get a benefit out of them.

Anyone have any input?

I installed my plugs yesterday and now I have such a smooth idle. Dam denso plugs were allowing my exhaust to pop after every rev I made. That meant that not all of the gas was being burned, so I took the plunge and ordered them. Heres the pic of my old Denso Plug and my new NGK Iridium plug. The drivabilty is so much better and the gas milage went back up!

http://www.precisionmuffler.com/0bcc0500.jpg

im using ngk iridium ix in my civic si....very good plugs

I am going to vegas i an hour, so I will see if the gas milage is back to normal. :D

Various Toyotas come with various plugs. There are conventional, dual-electrode conventional, platinum, dual electrode platinum and irridium. The conventional plugs last for 30K with practically no change in performance. The platinum plugs go 60k, and the irridium go 110k. Each engine uses a particular plug for that application and you can bet your ___ that Toyota knew what they were doing when they installed plugs in your car. Lit is lit and thats all plugs do. Period. The cars ECM has a sophisticated Misfire Monitor system that will detect and record a single misfire through measuring crankshaft accelleration at each firing pulse to detect misfire. If your car was misfiring the MIL (check engine light) would light and if it was a dead miss the light would flash to warn of impending converter damage.It would set a code to tell which cylinder was misfiring or set a "random cylinder misfire" code if they were all misfiring. As far as not burning all the fuel or such, again the O2 sensors would register this and if fuel trim varied by 15% or so the MIL would light and record a code for "fuel trim rich" or "fuel trim lean". Irridium plugs are fine for the engines that were designed to use them and a waste of money for those that were not. The only performance gain they could possibly give over the stock plug is by increasing the power-to-weight ratio by lightening your wallet! ~~~~~~~~~~~~~scott

Dam denso plugs were allowing my exhaust to pop after every rev I made. That meant that not all of the gas was being burned

Is that really why???

FAWK, I have like 3-5 pops when I shift and even more when I race

Is that really why???
FAWK, I have like 3-5 pops when I shift and even more when I race

Unburned gas pops in the exhaust. So if the plugs are fouled up, say hello to popping exhaust. :D

There would have to be sufficient oxygen present in the exhaust to burn any unburned fuel. One of the most common ways to introduce the extra oxygen is by an ill-designed exhaust system that allows reversion when you chop the throttle. Either the pipe is too big or the muffler doesn't have enough backpressure. Most exhaust systems designed for street use dont pop.

2.25" piping, dc headers, no cat, no resonator, free flow muffler.............HMMMMMMMMMMM

There would have to be sufficient oxygen present in the exhaust to burn any unburned fuel. One of the most common ways to introduce the extra oxygen is by an ill-designed exhaust system that allows reversion when you chop the throttle. Either the pipe is too big or the muffler doesn't have enough backpressure. Most exhaust systems designed for street use dont pop.

Thats funny because I was able to make my stock system pop before my exhaust system was installed too!! :lol:

ill tell you what... all I know is that I spent $20 a while back on a set for my 91 mr2 turbo and it saves me a lot of headache on replacing my copper set every-other oil change :) other than that, I really didnt feel a power difference at all from copper -> iridium

ill tell you what... all I know is that I spent $20 a while back on a set for my 91 mr2 turbo and it saves me a lot of headache on replacing my copper set every-other oil change :) other than that, I really didnt feel a power difference at all from copper -> iridium
but you didn't put one in your scion, so you don't know if there is going to be the same rating.

The misinformation is flying in this thread!

Your ignition system is designed for a particular type of plug, which is the factory recommended plug. If you wish to use a different type of plug, you have to modify the ignition system to suit.

Changing the electrode configuration changes the way the plug responds to voltage, which in turn can upset the timing of the engine. If you take an engine that is designed for fat electrode conventional plugs and replace those plugs with thin electrod plugs you have effectively lowered the firing voltage and the energy delivered by the plug during firing. This is exactly what you _don't_ want to do!

If the ignition system is designed for thin electrode plugs, they can work great, but they aren't a magic bullet for all cars.

You will see testimonials saying "I installed these plugs and got 10HP/smoother idle/easier starting/better love life/etc. Usually, what has happened is that the person has removed worn out conventional plugs and replaced them with new whiz-bang plugs, taking the ignition from 50% function to 75% function. He would have done even better if he had replaced his tired conventional plugs with new conventional plugs! :)

George


Finally a voice of reason cries out in the wilderness 8)

Save your money kids. New fancy plugs and bright yellow spark plug wires won't make the hamster run any faster in that wheel. You would think after years and millions of dollars of suckers money spent "souping" up Civics with faux mods like thie people would know.

"Hey man... I jus' got a new super ultra turbo battery from Costco, it makes the ignition stronger and gives you like 15 more horsepowers, man"


:roll: :lol:

Finally a voice of reason cries out in the wilderness 8)

Save your money kids. New fancy plugs and bright yellow spark plug wires won't make the hamster run any faster in that wheel. You would think after years and millions of dollars of suckers money spent "souping" up Civics with faux mods like thie people would know.

"Hey man... I jus' got a new super ultra turbo battery from Costco, it makes the ignition stronger and gives you like 15 more horsepowers, man"


:roll: :lol:

If you haven't done it yourself to a scion, than you really can't say to much. And comparing this car to a civic is not the right way to go. The toyota motor is a different design than the honda. :roll:

ok quick question. Are the Stock plugs in the xB Resistor or Platinum? I'm about ready to replace my plugs real soon.

i am pretty sure they are twin electrode platinum plugs. if you make the switch to a different kind of plug, you will notice a whopping 0.001% difference.

New fancy plugs and bright yellow spark plug wires won't make the hamster run any faster in that wheel.

Yellow Sparkplug wires? Damn, where can I get some? better yet, where would I put them on my xB? :)

Finally a voice of reason cries out in the wilderness 8)

Save your money kids. New fancy plugs and bright yellow spark plug wires won't make the hamster run any faster in that wheel. You would think after years and millions of dollars of suckers money spent "souping" up Civics with faux mods like thie people would know.

"Hey man... I jus' got a new super ultra turbo battery from Costco, it makes the ignition stronger and gives you like 15 more horsepowers, man"


:roll: :lol:

If you haven't done it yourself to a scion, than you really can't say to much. And comparing this car to a civic is not the right way to go. The toyota motor is a different design than the honda. :roll:


Sorry if I offended anyone, I didn't mean to be a d1ck.

But, I don't have to put special sparkplugs in a Scion to know that it will do nothing. It makes no difference if it's a Civic engine or not. Two small inline 4 cylinder engines that burn gasoline.

In facgt, You can compare it to any non-high performance car you want. V6 Camry? sure. Ford F150...whatever. Quad tip irridium turbo super-deluxe spark plugs aren't going to give you any meaningful increase in horsepower unless you are replacing fouled plugs with them. Neither is a more powerful battery or new spark plug wires.

I don't know everything, but I do know cars. Take my word on it.

See if you can find reputable dyno results showing a power increase from spark plugs on a Scion, or any other car remotely similar to it. Unless the laws of physics have changed since I last checked, it ain't gonna happen bro.

I bought my Irridiums at Autozone for like $12 a piece. I drive the ____ out of my xB and I'd have to say that it's a noticeable difference. I'm also running the Injen short ram intake and have a ground wire kit I made myself. I've put 12,000 miles on my car in the last 4 months and when I changed my plugs they looked pretty good but had a little carbon buildup. They are a well designed plug, but there are better.

I'm not sure why everyone on here thinks that Toyota makes a system that is so exact that by putting in different plugs you're going to ruin the way the ignition works. It would be like saying that you're suspension won't work better with better rims and tires. Because you know, Toyota designed it to work together. Sorry, when I put my light weight Konig Heliums on with Yokohama Parada SpecII tires the cornering capability went way up. Yes there is alot more road noise, but thats not a big deal to me. You put a better more capable plug in your motor and it will spark under harsher conditions. And it will be more likely to create a cleaner burn under normal conditions.

The factory ignition system may have a really great sensor network that can read all kinds of information and do wonderful things with it. But each combustion is completely unique, and the better the burn you get, the more power you will make. Don't act like combustion engines are any more technological than they are, you ignite distilled petroleum, it expands, you turn heat energy into motion.

The performance gain for the money you spend is your choice. I went with it, and I'm impressed so far.

I don't know everything, but I do know cars. Take my word on it.

See if you can find reputable dyno results showing a power increase from spark plugs on a Scion, or any other car remotely similar to it. Unless the laws of physics have changed since I last checked, it ain't gonna happen bro.

Looks like I have to prove another person wrong like I did on the tC dual exhaust topic, why don't people listen to te exhaust guy that has scion knowledge. And I never said you had to change the laws of physics, just try out the plugs catch up to me! :shock:

I have a little Toyota and Scion experience myself and I'll be the first to wave the BS flag on a lot of this discussion. OBD II monitors misfire EVERY SINGLE FIRING CYCLE. It records it as misfire data. The A/F and O2 sensors record oxygen content of the exhaust gasses. If incomplete combustion occurred the long term fuel trim numbers would reflect this. The stock plugs for the most part work perfectly and I also can't comprehend some folks claims that so-and-so's plugs increase horsepower. I call bull____ and would be very interested in your sources for these incredulous claims. Anyone remember Splitfire spark plugs? Didn't they also make all these wonderful claims? Why not toss some Splitfires in your car?

Anyone remember Splitfire spark plugs? Didn't they also make all these wonderful claims? Why not toss some Splitfires in your car?

Because the splitfire plugs were for the V8s in domestic cars, I thought you had some knowledge on scions? :roll: Look all I am saying is if you didn't try them out for your self than you can't say anything. This isn't that dam thing on ebay for 29.99 that promises 20HP, sh*t even I didn't say it was a 20hp add on. All I am saying is that there is a difference in power and responce. Never said how much, just that the car feels better. explain that one to me and why the car still feels better to this day. :shock: :roll:

I'm not taking sides, but some of the "it feels better to me" comments can be a psudo thing. You know you've changed them and it had to make some difference. I would like to see some dyno results or some other kind of testing. Yes, there are better plugs. The factory plugs are a comprimise, as are many things in the automotive world. Any thing can be improved.

When I was in school a teacher once gave me a quick explanation of your normal ign system. Take one lighter and quickly wave it under a piece of paper. Did it catch on fire? No. Now, take two lighters and hold them together. Quickly wave them under the same paper. Did it catch on fire now? No. It takes time to light the fire. Changing one element slightly is not very likely to make any difference.

Stylis, the exhaust fumes must be getting to you. :lol: Splitfire plugs were made for most all cars, trucks and motorcycles. They are snake oil and didn't do ____. And Hongs66, what is exactly compromised in the factory plug? Name me one plug that would be "better". Folks the bull____ flag is flying high in all its glory. And Stylis, I have all the Scion knowledge allowed by law in 48 states, :roll: and you are "exhausting" me.

Stylis, the exhaust fumes must be getting to you. :lol: Splitfire plugs were made for most all cars, trucks and motorcycles. They are snake oil and didn't do ____. And Hongs66, what is exactly compromised in the factory plug? Name me one plug that would be "better". Folks the bull____ flag is flying high in all its glory. And Stylis, I have all the Scion knowledge allowed by law in 48 states, :roll: and you are "exhausting" me.

always nice to see the people who talk ____ have no profile. :roll: And also nice to see that you don't wanna pull your head out of your ___ with your flag to try out the plugs yourself. I am not here to sell people bum products either, I am here to help share the knowledge of what they can do. I am not pushin anyone to buy them. You want to buy it go for it, you don't fine. I am just saying that they do work and if you don't want to believe me fine.

Please take this to PM, or email. I'm sure others don't want to see what has been posted and what will be posted.

If someone has a dynosheet to prove, then fine. If someone is giving their first hand experience, then fine. But if you're trying to prove something, let's see the dyno sheet.

I will say this, when I used to road race motorcycles when I was in AFM, I changed out my plugs to splitfires, and the response was better. But then again, that was 10+ years ago, and maybe my skills just happen to improve everytime I was on the track.

Scott... All things in the automotive world are a compromise. In the suspension world they give up some performance for a softer ride. Most of us change the springs to get the better handling and give up a little softness. I'm sure that the spark plug is no different. It's designed to light the fuel and disapate heat. Changing the material or design will make diferences. Like I said show me a dino sheet and I will believe. Until then I will stick with factory plugs.

always nice to see the people who talk ____ have no profile. And also nice to see that you don't wanna pull your head out of your ___ with your flag to try out the plugs yourself I'm sorry I didn't have time to write a profile, but I wasn't trying to date, just talk about cars. :lol: Anyway, I'm tall with brown hair, a leo, like long walks in the park, nd work as a Master Diagnostic Technician for Toyota. I'm married so we can't really date, but thanks anyway. As for the plugs, I am still waiting for some conclusive proof of these HP and response claims other than the seat of YOUR pants. I have worked on cars, motorcycles, and airplanes for many years and personally have never seen these 'hyped" HP claims amount to ____. Magnets on the fuel line, Slick 50, Splitfires...........I'll save my money for worthwhile things. By the way, exactly which spark plugs are the ones I should pull my head out of my ___ and try?Posted: Fri Jan 30, 2004 10:18 am Post subject:

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heck pull out your old plugs and they say denso right on them. I wouldn't doubt if there were already platnum or iridium.
I think if your head was out you would have realized that the stock plugs are neither platinum or irridium, but conventional plugs. Or didn't you notice that when you put the super duper plugs in?

always nice to see the people who talk ____ have no profile. And also nice to see that you don't wanna pull your head out of your ___ with your flag to try out the plugs yourself I'm sorry I didn't have time to write a profile, but I wasn't trying to date, just talk about cars. :lol: Anyway, I'm tall with brown hair, a leo, like long walks in the park, nd work as a Master Diagnostic Technician for Toyota. I'm married so we can't really date, but thanks anyway. As for the plugs, I am still waiting for some conclusive proof of these HP and response claims other than the seat of YOUR pants. I have worked on cars, motorcycles, and airplanes for many years and personally have never seen these 'hyped" HP claims amount to ____. Magnets on the fuel line, Slick 50, Splitfires...........I'll save my money for worthwhile things. By the way, exactly which spark plugs are the ones I should pull my head out of my ___ and try?Posted: Fri Jan 30, 2004 10:18 am Post subject:

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heck pull out your old plugs and they say denso right on them. I wouldn't doubt if there were already platnum or iridium.
I think if your head was out you would have realized that the stock plugs are neither platinum or irridium, but conventional plugs. Or didn't you notice that when you put the super duper plugs in?



haha...you can lead a horse to water, but you can't make em change their snake oil plugs...these guys should go to the track and watch fast cars...then see what they're using.

I'm sorry, but after reading all of this. I have to say a few things. For a "Master Diagnostic Technician for Toyota" you should know that, large multiple miss fires will be logged by the ECM along with a "lean" or "Excessive" fuel code, but a small pop from air being sucked in the exhaust while either revving or between shifts would go un noticed by any ECM.

Now, to the fun part. Lets take our OBD II system. This system takes constant readings of fuel/air/spark/timing/ and all of that other neat stuff and adjust as needed on the fly. This only gets better and faster in a OBD III system (Which I believe out cars is!!)! Now, I'm not going to say that replacing the plugs with the highend plugs is going to give you great gas milage or some un-godly amount of HP gain. The fact is, that is impossible! BUT, they can help to give small improvements to the ingintion system with a plug that fires faster, and has a more constant spark. That is why they had the "Splitfire"' plugs. They improved spark, which in theory should improve performance. Same goes with the plugs here. They flow the voltage/amperage better then the stock "Conventional" plugs. Thus giving some improvements. I myself notice better throttle response, smoother idle and a little better gas milage.

And all of this from and old school Mechanic that builds "Hot Rods" for fun. I'm all about horse power and performance. The topic here is basic auto mechanics, something taught in HIGHSCHOOL Autoshop!

Thanks for you time
Tim

AKA EvilScion

P.S.

I'm not an english major. I'm a wrench. So, please excuse the spelling.

How much do these splitfires cost?

How much do these splitfires cost?

You don't want the Splitfires. They did have some problems like over heating. But they were average of about $20 a plug.

I'm sorry, but after reading all of this. I have to say a few things. For a "Master Diagnostic Technician for Toyota" you should know that, large multiple miss fires will be logged by the ECM along with a "lean" or "Excessive" fuel code, but a small pop from air being sucked in the exhaust while either revving or between shifts would go un noticed by any ECM.

Now, to the fun part. Lets take our OBD II system. This system takes constant readings of fuel/air/spark/timing/ and all of that other neat stuff and adjust as needed on the fly. This only gets better and faster in a OBD III system (Which I believe out cars is!!)! Now, I'm not going to say that replacing the plugs with the highend plugs is going to give you great gas milage or some un-godly amount of HP gain. The fact is, that is impossible! BUT, they can help to give small improvements to the ingintion system with a plug that fires faster, and has a more constant spark. That is why they had the "Splitfire"' plugs. They improved spark, which in theory should improve performance. Same goes with the plugs here. They flow the voltage/amperage better then the stock "Conventional" plugs. Thus giving some improvements. I myself notice better throttle response, smoother idle and a little better gas milage.

And all of this from and old school Mechanic that builds "Hot Rods" for fun. I'm all about horse power and performance. The topic here is basic auto mechanics, something taught in HIGHSCHOOL Autoshop!

Thanks for you time
Tim

AKA EvilScion

P.S.

I'm not an english major. I'm a wrench. So, please excuse the spelling.DAM Scott17 GOT OWNED!!! :lol:

Posted: Tue Aug 31, 2004 11:25 pm Post subject:

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I'm sorry, but after reading all of this. I have to say a few things. For a "Master Diagnostic Technician for Toyota" you should know that, large multiple miss fires will be logged by the ECM along with a "lean" or "Excessive" fuel code, but a small pop from air being sucked in the exhaust while either revving or between shifts would go un noticed by any ECM.


If you had a point it escapes me. I do know that a random misfire(P0300) code rarely would ever set a lean or rich code because misfire is within the normal envolope of fuel trim capabilities. I also know that an exhaust leak upstream of #2 O2 sensor can set a P0171 lean code by introducing more oxygen into the exhaust. I also know that with a real time data list you can monitor each cylinder individually for ANY occurance of misfire ( as in a SINGLE missfire). What I was talking about was aftermarket plugs and people who are convinced they are some how "better" than the stock plug. I call bull____. Some will definately last longer at a correspondingly higher price, but none will perform better. Show me the proof or stifle yourself.Posted: Wed Sep 01, 2004 9:27 am Post subject:

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chucksu wrote:
How much do these splitfires cost?


You don't want the Splitfires. They did have some problems like over heating. But they were average of about $20 a plug.
I don't know where you come from but Splitfire plugs averaged about $6 each. As for a plug firing "faster" give me a break, go back to high school and study some physics. A plug with more resistance will actually fire hotter from longer coil saturation at the expense of more heat build up and therefore shorter service life of the coil. But hell, what do I know, Toyota engineers could always use the help of "the muffler man" and Joe" hot-rodder" when they design ignition systems. You guys should really pursue that! :roll:

So if these splitfire plugs cost $6ea & you need 4 thats $24. So you might be lucky & gain 1%hp if you have the gap set just right. So $24 for maybe 1hp. Seems ok but Im a cheap person so I would just stick with stock. I could just drop 20Lbs from the car & gain the Equivalence of 1hp plus get the addition of a little better handling. Just my IMO though.

If you had a point it escapes me. I do know that a random misfire(P0300) code rarely would ever set a lean or rich code because misfire is within the normal envolope of fuel trim capabilities. I also know that an exhaust leak upstream of #2 O2 sensor can set a P0171 lean code by introducing more oxygen into the exhaust. I also know that with a real time data list you can monitor each cylinder individually for ANY occurance of misfire ( as in a SINGLE missfire). What I was talking about was aftermarket plugs and people who are convinced they are some how "better" than the stock plug. I call bull____. Some will definately last longer at a correspondingly higher price, but none will perform better. Show me the proof or stifle yourself.

I don't know where you come from but Splitfire plugs averaged about $6 each. As for a plug firing "faster" give me a break, go back to high school and study some physics. A plug with more resistance will actually fire hotter from longer coil saturation at the expense of more heat build up and therefore shorter service life of the coil. But hell, what do I know, Toyota engineers could always use the help of "the muffler man" and Joe" hot-rodder" when they design ignition systems. You guys should really pursue that! :roll:

Wow, that is one big chip on your sholders! I think you need to chill some and look at reality for a little bit. No one here has said that there is going to be some massive improvement. All that has been stated is a possiblity of a few things. But, since your obviously soooo much better then the rest of us that build real cars, and I might had, not just hot rods, but pro-drag funny cars and such. Not, to mention the fact of a proven race career since the age of 18. I might be just a simple wrench, but I do know better then to look and try something before I put it down. Because if it wasn't for that I wouldn't have become the good mechanic that I am today!

So, take the chip off and give it a chance. Then comment. Nothing is better then proving something yourself!

No chip here whatsoever. I am just very curious as to exactly which plug you tried in your Scion that resulted in an improvement. I have never gotten an answer to that question. I would love to try it for myself. I only question your knowledge when you make statements such as:Now, I'm not going to say that replacing the plugs with the highend plugs is going to give you great gas milage or some un-godly amount of HP gain. The fact is, that is impossible! BUT, they can help to give small improvements to the ingintion system with a plug that fires faster, and has a more constant spark. That is why they had the "Splitfire"' plugs. They improved spark, which in theory should improve performance. Same goes with the plugs here. They flow the voltage/amperage better then the stock "Conventional" plugs. Thus giving some improvements. I myself notice better throttle response, smoother idle and a little better gas milage.

Do you have any factual proof whatsoever that Splitfire plugs "improved spark", "flow the voltage/amperage better than stock.. thus giving some improvements"? I would love to see any info you can give me on this matter so I can get up to speed in the spark plug world. I'll let you get back to building those "real" cars and I'll get back to working on all these fake Toyotas. Keep me posted.~~~~~~~~~~~~scott

No chip here whatsoever. I am just very curious as to exactly which plug you tried in your Scion that resulted in an improvement. I have never gotten an answer to that question. I would love to try it for myself.

I'll let you get back to building those "real" cars and I'll get back to working on all these fake Toyotas. Keep me posted.~~~~~~~~~~~~scott


I guess the tech forgot to read the topic. We are talking about the NGK iridium plugs helping us out, but you want factual proof which at this point still won't shut you up. So as far as I know you could just be some guy trying to enrage us and look like a fool on scionlife. If you don't want to take the word of the scionlife peeps that this spark plug works than, say your peace and stop posting or else don't say anything at all.
Everyone on the boards now see you as d*ck because your just insulting people and not putting an end to it. :roll: I already stated that if people want to try it they can, if they don't than that is their loss.

I guess the tech forgot to read the topic. We are talking about the NGK iridium plugs helping us out, but you want factual proof which at this point still won't shut you up. So as far as I know you could just be some guy trying to enrage us and look like a fool on scionlife. If you don't want to take the word of the scionlife peeps that this spark plug works than, say your peace and stop posting or else don't say anything at all.
Everyone on the boards now see you as d*ck because your just insulting people and not putting an end to it. :roll: I already stated that if people want to try it they can, if they don't than that is their loss.

At this point I have to agree with Stylis. I don't think that there will be anything that can be said to shut you up or keep you on topic, unless someone installed a set of NGK iridium plugs in your Scion to prove it to you. And since your obviously not willing to experiment and try them yourself, because Toyota make the perfect car. There isn't any point in this conversation to go on with you.

Ok guys. Some of us want real numbers. I found some dyno charts for iridium denso website. If you disagree, you should argue this issue with the company and enlighten us in the forum also.

http://www.densoiridium.com/tunerstales.php

Yeah, those HP figures measured at the brochure are quite impressive indeed! Do you remember all the "factual" evidence that Splitfire provided us that "proved" that Splitfire plugs were the best thing since sliced bread? Why aren't you running those? I didn't notice any of the parameters of that dyno info listed. Was it a back to back run with the only difference being a change from new stock plugs to new irridium plugs? What is the standard deviation of the dyno used? I really don't feel the need to argue the point with Densos advertizing department because I truly believe they would not care. Here's what i do know though: In 1998 Toyota introduced irridium plugs in the newly-redesigned Land Cruiser with the 2UZ motor. Toyota informed us that the only benifit was longer service life. If more power was an added benifit, don't you think automakers would be sure to stress that point in their advertising? Why did no automakers supply their cars with Splitfire plugs as stock equipment? I think with all that available horsepower there for free they would have jumped on it! The latest and greatest plug is just that. In a Scion engine, normally aspirated, no plug is going to show any performance gain over the stock plug. I suggest a test for all the nay-sayers: go somewhere and drive your car, then don't look as your buddy changes your plugs out (or does he?) and drive it again. Feel the difference? :roll:

Ok guys. Some of us want real numbers. I found some dyno charts for iridium denso website. If you disagree, you should argue this issue with the company and enlighten us in the forum also.

http://www.densoiridium.com/tunerstales.php

Thank you for the link. Thats a big help for everyone, now people can decide for themselves what is right for them.

all i can say is if u get some iridiums you will gte like a 3hp increar. not enough to "feel" but hell anything and everything helps. every lil bit helps. oh and from my experience with using iridiums in other cars denso plugs are better than ngk's allthough to me ngk wires are next best to hotwires. either way no wires in da scion.

IMO, Toyota make cheaps cars with good reliable, acceptable performance and good MPG. They want to maximize the profit, but not the engine performance. Lexas is their high-end cars that tuned toward performance and comfort. It is unlikely that they use the best performance parts in scion unless the parts cost less or add substantial benefit to the car.

You guys decide....

^ Um, no.

yeah theres not too much performance at lexus nowadays. the lil coupes r decent and the gs's are cool but not hi perf at all.

ok, my bad :lol:

What I mean by performance is just a bigger engine. :)

so like.... should i got those sparkplugs or what?

these plugs can only do good for your ride. No harm is done to the motor.

r those better than 4-prong platinum?

Electricity takes the path of least resistance.
So even if the sparkplug had 100 prongs electricity will only travel down 1 prong.
The only things I can think that will affect spark will be quality of conductor and how well that conductor will withstand heat and corrosion.

Show me the dyno sheets.

Show me the dyno sheets.

I found some dyno charts for iridium denso website.

http://www.densoiridium.com/tunerstales.php

:wink:

Show me the dyno sheets.

I found some dyno charts for iridium denso website.

http://www.densoiridium.com/tunerstales.php

:wink:

Okaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay. I saw that link and checked it.

But how about the other plugs that are mentioned?

Or the test parameters? If someone could show me some conclusive data that proves that merely switching from new stock plugs to irridium plugs will increase horsepower I'll eat my shorts. I have all the technical training that Toyota has to offer and I have never known this to be true. Where are you guys getting your info?

From the Faerie dust.
Why would a Company out to make money exagerate to get sales?

Beats me.

Hello greeting from singapore, didn't know that iridiums costs that much in america. In singapore there are plenty of iridiums to choose from namely:

Denso iridium at S$62 (Set of 4)
OWS double iridium S$53 (Set of 4)
Volker Iridium S$47( Set of 4)

Found that fuel comsumption lower after fitting these and lighter foot. Anyway have a dyno comparing the volker and denso showing that volker is slightly better few horses.

Links :

http://www.volker-iridium.com/

http://www.ows.com.au/index.html

http://www.densoiridium.com/

Dyno for a vios auto comparing Denso iridium with volker iridium

http://img.photobucket.com/albums/v409/blacvios/volker_dyno_auto.gif

What size spark plug socket do our cars use?

I have Denso iridium plugs in my car. Without using anti-seize applied around the screw contact, the plugs don't perform well. I only feel very small improvement and more vibration. My gas mileage is also the same or a little worse. Yesterday, I took them out, I noticed carbon deposits everywhere but the tips are still ok. After I apply some anti-seize and put them back, I feel that the car is lighter, has better acceleraion and less vibration. A better feel than using the stock plug for sure.

Anyway, for anyone who want to try, I think the iridium plugs works for our car if you install them properly. Otherwise, the stock one runs better.

So you removed your plugs and applied anti-seize to the threads and now you feel a power increase? What do you attribute this to, better contact? Very curious.