BOSCH PLATINUM +4 SPARK PLUGS???
Junior Member
Joined: Jul 2005
Posts: 17
From: Houston
Originally Posted by Scott17
Lets imagine that those silly plugs were twice as expensive as Denso Irridiums, yet yielded better MPG. Do you really think the Toyota engineers would pass on them for a dollar or so? Seems silly when you really think about it.......maybe you should really think about it before you post silliness. 
hmnn...
Junior Member
Joined: Jul 2005
Posts: 17
From: Houston
Originally Posted by engifineer
^^^
I dont need experience with those particular plugs to tell you that you WILL not realistically see a 1mpg difference in mileage in that short of a span. To do that you are telling me your car got EXACTLY the same mileage every time you drove it (which will never happen), because if your numbers are off even 1 mpg from run to run you have completely lost your calculation. That comes down to simple sampling and math.
As far as durability, you just said above that you could say they would perform after 50k, now you say 100k.
I have had experience with Bosch in general, and they lasted LESS time than any standard plug I ran, which is why I switched back. Many of my fathers customers as well have switched back to Delco even after running Bosch. I personally have never gotten my moneys worth out of them.
I dont want to get into a ____ing contest, but I know enough about math and cars to know the gas mileage part is not a reliable calculation. I have driven mine to OK from MN approximately 6 times so far, taking the EXACT route each time on the 620 mile (one way) trip. I see the mileage average for that trip alone change by up to 5 mpg one way or the other. The same with my other cars. And you are telling me your car was so stable that it ran the exact same numbers all the time and you could see a 1mpg increase, which wont happen. you may have calculated it, but you could just as easily blame it on any of the other variables that effect economy. To calculate such things you need controls. Meaning NOTHING else can possibly change other than your variable, the plugs. This means fuel, outside temp, humidity, road conditions, tires and on and on have to be exactly the same, especially to quote such a small change. did they increase mileage? That is possible, and I am not saying it isnt. But the difference you calculated cannot be pinned on the plugs with all of the other variables in place.
But, arguing is not what I want to do here. I do respect your opinion and your experiences in the matter. We simply dont agree in this situation, and we are getting some good info posted as well. But a good debate is always fun
I dont need experience with those particular plugs to tell you that you WILL not realistically see a 1mpg difference in mileage in that short of a span. To do that you are telling me your car got EXACTLY the same mileage every time you drove it (which will never happen), because if your numbers are off even 1 mpg from run to run you have completely lost your calculation. That comes down to simple sampling and math.
As far as durability, you just said above that you could say they would perform after 50k, now you say 100k.
I have had experience with Bosch in general, and they lasted LESS time than any standard plug I ran, which is why I switched back. Many of my fathers customers as well have switched back to Delco even after running Bosch. I personally have never gotten my moneys worth out of them.
I dont want to get into a ____ing contest, but I know enough about math and cars to know the gas mileage part is not a reliable calculation. I have driven mine to OK from MN approximately 6 times so far, taking the EXACT route each time on the 620 mile (one way) trip. I see the mileage average for that trip alone change by up to 5 mpg one way or the other. The same with my other cars. And you are telling me your car was so stable that it ran the exact same numbers all the time and you could see a 1mpg increase, which wont happen. you may have calculated it, but you could just as easily blame it on any of the other variables that effect economy. To calculate such things you need controls. Meaning NOTHING else can possibly change other than your variable, the plugs. This means fuel, outside temp, humidity, road conditions, tires and on and on have to be exactly the same, especially to quote such a small change. did they increase mileage? That is possible, and I am not saying it isnt. But the difference you calculated cannot be pinned on the plugs with all of the other variables in place.
But, arguing is not what I want to do here. I do respect your opinion and your experiences in the matter. We simply dont agree in this situation, and we are getting some good info posted as well. But a good debate is always fun
there is the law of averages. when the elevation, temperature, humidity, road conditions is the same, the avereges will tell a story. Now, i drive in the flat lands of TX, & I drive the same long trip every DAY, keeping the variables stable. I squeeze the gas lever 2 more times until auto shut off after the 1st auto shut off. If you don't do that, your gas mileage calculation will be incorrect. Not only that, I average the MPG.....by taking the total miles divided by the total gas load through sever tanks. when i'm getting 25-26 mpg with the bosch 4+, then suddenly drop to 23-24.5, I KNOW there's somethin wrong, and changed. I know math, and i know how to keep variables constant in an experiment.
Now, I've tried bosch 2+ and bosch platinum themselves...i do not recommend them.....but I certainly will recommend bosch 4+.
Senior Member
StyleWagons
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Scion Evolution
Joined: Mar 2004
Posts: 1,459
Man you ain't lived till you try the new Bosch 6+! They are way better than the 4s!!!! 
"well, lets see. why don't toyota use light weight aluminum wheels to yield more gas mileage? why don't toyota use k&n filters in the airbox to increase performance and fuel enconomy (i know you cannot argue with this fact, even engifineer might have to agree to this fact)? why don't toyota engineers use a free flowing exhaust to increase performance and fuel economy? why did the toyota ENGINEERS pass this up? hmnn...
" When you learn the answers to these questions someday you might make better decisions about gimmics like Bosch 4+ sparkplugs and other such drivvel.
"well, lets see. why don't toyota use light weight aluminum wheels to yield more gas mileage? why don't toyota use k&n filters in the airbox to increase performance and fuel enconomy (i know you cannot argue with this fact, even engifineer might have to agree to this fact)? why don't toyota engineers use a free flowing exhaust to increase performance and fuel economy? why did the toyota ENGINEERS pass this up? hmnn... " When you learn the answers to these questions someday you might make better decisions about gimmics like Bosch 4+ sparkplugs and other such drivvel.
Junior Member
Joined: Jul 2005
Posts: 17
From: Houston
Originally Posted by Scott17
Man you ain't lived till you try the new Bosch 6+! They are way better than the 4s!!!! "well, lets see. why don't toyota use light weight aluminum wheels to yield more gas mileage? why don't toyota use k&n filters in the airbox to increase performance and fuel enconomy (i know you cannot argue with this fact, even engifineer might have to agree to this fact)? why don't toyota engineers use a free flowing exhaust to increase performance and fuel economy? why did the toyota ENGINEERS pass this up? hmnn...
" When you learn the answers to these questions someday you might make better decisions about gimmics like Bosch 4+ sparkplugs and other such drivvel.
"well, lets see. why don't toyota use light weight aluminum wheels to yield more gas mileage? why don't toyota use k&n filters in the airbox to increase performance and fuel enconomy (i know you cannot argue with this fact, even engifineer might have to agree to this fact)? why don't toyota engineers use a free flowing exhaust to increase performance and fuel economy? why did the toyota ENGINEERS pass this up? hmnn... " When you learn the answers to these questions someday you might make better decisions about gimmics like Bosch 4+ sparkplugs and other such drivvel.
Originally Posted by Scott17
Scott17 wrote:
Lets imagine that those silly plugs were twice as expensive as Denso Irridiums, yet yielded better MPG. Do you really think the Toyota engineers would pass on them for a dollar or so? Seems silly when you really think about it.......maybe you should really think about it before you post silliness
Lets imagine that those silly plugs were twice as expensive as Denso Irridiums, yet yielded better MPG. Do you really think the Toyota engineers would pass on them for a dollar or so? Seems silly when you really think about it.......maybe you should really think about it before you post silliness
Senior Member
StyleWagons
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Scion Evolution
Joined: Mar 2004
Posts: 1,459
Dude, can you really see grandma out in the garage oiling up a K&N getting her apron all greasy? The air filters that come in all Toyotas filter better than a K&N regardless of how many Hot Rod magazines you have read. They also don't degrade the performance of airflow meters like a juicy K&N will. If you change the stock air filter every 15000 miles, you will never have a problem in that department. The stock air filter and the charcoal mat in the airbox hold onto unburned hydrocarbons that are present every time the engine is stopped and an intake valve is open. But hey, them silly engineers don't know jack, they should hire youngsters with no real overall knowledge of modern engines that couldn't be gleaned from the latest issue of Import Tuner mag. While your at it, do you think a K&N filter really outflows a clean stock filter enough to matter one iota? Measure it and see. Don't know how to measure it? I rest my case.....
The air filters that come in all Toyotas filter better than a K&N regardless of how many Hot Rod magazines you have read. They also don't degrade the performance of airflow meters like a juicy K&N will. If you change the stock air filter every 15000 miles, you will never have a problem in that department. The stock air filter and the charcoal mat in the airbox hold onto unburned hydrocarbons that are present every time the engine is stopped and an intake valve is open. But hey, them silly engineers don't know jack, they should hire youngsters with no real overall knowledge of modern engines that couldn't be gleaned from the latest issue of Import Tuner mag. While your at it, do you think a K&N filter really outflows a clean stock filter enough to matter one iota? Measure it and see. Don't know how to measure it? I rest my case.....
Senior Member
SL Member
Joined: Dec 2004
Posts: 1,458
From: Everywhere
Iriduims are better than the platnuim, Just because a plug has 4 places to fire from doesn't mean it will and they dont! The only good thing about these plugs are for cars that are burning oil because if one becomes clogged with oil or oil fouled then it still has four more to shoot to. +4's are a waste of money.
Senior Member
SL Member
Joined: Nov 2005
Posts: 866
From: NJ
when i used to be on an accord v6 site, someone actually did a dyno of aftermarket plugs. The denso iridium's yeilded between4-5 hp throughout the rpm range, which is insane for a spark plug. True this is a different car, but you cant knock good engineering.
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Scinergy
Joined: May 2005
Posts: 1,409
From: Englewood, CO
Instead replacing your your spark plugs, you should line up the spark so it will face the combustion chamber. I heard it will improve your hp and gas mileage. Just use a marker so youll know where you need to face it.
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Strictly Scionized
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Joined: Oct 2004
Posts: 1,284
From: White Marsh, Balti Co., MD
Originally Posted by Lonely_Raven
Originally Posted by Scott17
The stock plugs CANNOT be improved upon no matter who tells you whatever. Theywere the best available plug for that engine and that's why they were chosen to be put in the engine. Do youself a big favor and don't molest your perfectly good car!!!!
True Japanese Denso Iridium plugs, you can't really do better.
Don't believe the hype of all these magic plugs getting you +4 HP or whatever.
Denso or NGK FTW!
I had a 300zx before this tC, that car didnt run on anything else besides $10 platium plugs from NGK. I always loved reading everyones post on yeah I changed my spark plugs to _________ brand and now my car sputters, misfires, etc......
Just stick with what the manufacture recomends.
*squeeze*
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SL Member
Joined: Dec 2004
Posts: 1,458
From: Everywhere
Originally Posted by schwettynuts
Instead replacing your your spark plugs, you should line up the spark so it will face the combustion chamber. I heard it will improve your hp and gas mileage. Just use a marker so youll know where you need to face it.
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Joined: Aug 2007
Posts: 937
From: Corona, CA
Ey i know this thread is hella old and right now im almost to 30k miles on my 06 tc. And i want to change my plugs and im thinking bout changing my plugs to NGK Iridium IX since all of u guys sed iridium is better than platinum or should i use a different type of NGK such as G-power or V-power??
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