Hey guys,
I dynoed my box monday. I dont think this is a thread yet so here it goes.

I've got 18" wheels, so I'm sure that didnt help improve my dyno results. All I have installed under the hood is a CAI.

Here's the results:
http://i70.photobucket.com/albums/i86/D_M_A_N/Scion%20Stuff/DynoResults1.jpg

Got about 84-85 hp

I will be installing a MMW 4-2-1 header, and will do another dyno pull afterwards. We'll see what the header does! I'm doubting i'll get more than 5hp with it. Hopefully it will help with gas tho'.

Nice. Im running about the same. Good to know about what Im putting down. Im interested to see what the header does.

also, I have seen other header that have the collector further back than MMW. I know with v8, the further the collector is, the more power(within reason) - Hence long tubes always showing more power.

It would be very interesting to see someone dyno the difference between the brands.

Which header is that?

I beleive it was both the megan and the DC. Tried looking up pictures just now, could find any...

Does anyone that have either of these confirm the the collector meets at the flange?

Actually, I took another look at the MMW, looks like a really good design.

Its suppose to be pretty good

Here's a pic
http://i70.photobucket.com/albums/i86/D_M_A_N/Scion%20Stuff/MMWhdr2.jpg

http://i70.photobucket.com/albums/i86/D_M_A_N/Scion%20Stuff/MMWhdr1.jpg

Yeah, looks good. Tell us how the install goes.

All of the xB headers have the collector flange in the same position. They have to in order to connect to the downpipe flange.

Yeah, i was looking at a different pic. My bad.

Dman

is yours an Auto?

Yes, auto
why do you ask? does the manual have diff HP?

Less drivetrain loss, manual is normally around 10-15% auto is around 20%

Ahh, I see.
Still havn't had a chance to install the header. Hopefully tomorrow I'll get a chance.

Nice, looks like a pretty strait forward install. Header is very visable and accessable. Though I havent tried it myself.

yeah, usually the auto has less hp / for the reasons already mentioned.

If it was manual I would have expected maybe mid 90's hp

Thats why I asked, cause it would have seemed really low for a manual

W

Ok Fellas, I installed the header yesterday. Everything went great thanks to the tech write up for changing your header.
I plan on getting it on the dyno Monday or Tuesday.
I didnt really notice a big difference. I havn't got it on the highway yet though.
But the proof will be in the numbers. WE WILL SEE!

dont forget to get paid.

i wanna see the results i think this has been long over due just no one has had the cash to do so for the dyno runs.

Dyno Run TomorroW!!

YAY!

Alrighty Fellas, wanna know what the results are?!?!

Here's the dyno sheet. The blue line is before header installation, the red line is after:
http://i70.photobucket.com/albums/i86/D_M_A_N/Scion%20Stuff/DynoResults.jpg

Before header 84.24hp & 85.80 Torque
After Header 88.62hp & 87.41 Torque

So... I gained about 4.38 HP. :eyebrow:

What do you guys think?

Looks like a good solid gain. Anywhere near what the header manufacturer said? Just curious.

I believe they claimed you know what

"HEADER MAKES 10.8TQ AND 11.1HP OVER STOCK. "

Straight from there site.

Yeah, looks like it killed your bottom end. How does it feel? I dont know if that small of a gain up top is worth the very signifigant loss in torque. The power curve doesnt look like it tappers off at the top which is good.

wasn't there dyno on a manual trans though?

I guess there would be a loss at lower driving speeds, but the gains take place at 4300rpm, so during a launch and race situation you should be in the positive end of the curve through out.

It feels a little more "peppy". Not by a whole lot though. I feel better throttle response, and it seems like it breaths a little better.
I cant really feel a decrease in the bottom end, though it shows on the graph. I guess I couldnt feel it because it sux so hard anyways stock.
I do feel the increase in the upper RPM's.

MMW site says the header gives you 10 HP?! :no:
I'd like to see an independant Dyno run on a manual with JUST the header. I seriously doubt it would make almost 3 times the hp of an auto.

You MIGHT be able to get that with a IHE combo on a manual tranny.

But as far as the Header alone? Heck no...

I'll take any HP I can get. I wasnt expecting 10hp out of it to be honest. I was kind of hoping for about 5hp though.

I know you can't do too much with these little engines, unless you're going to boost it.
I am a little dissapointed, but whatever...:tap: I'll take 4hp

Yeah, i would too (4hp), though I would have predicted an
honest 7hp, but gains add up. A buddy of mine keeps asking
me to do a dyno run, but I just don't like seeing the
numbers on these things, it really doesn't reflect how they
actually feel. But I may after the header, and I have a 5
speed. The MMW header is what I want, strictly because of
the mountable heat shield. So, maybe I will spend the 40
after and compare with yours. If i dont go MMW i'll test
whatever it is and post it up....at least 2 months, I have
exceeded my monthly budget on the box by a month or two,
according to the old lady. We'll see, but you should be
happy it wasn't a total wash. Good luck with future mods!

honestly 4.5hp out of a header on a car that is putting out mid80's is a very nice gain, i mean you're looking at around a 5% gain in power. I don't think you'll see a 10hp gain from just a header on any 4cyn N/A built after 1990. Even with a full exhaust that retains a cat you'd be pushing it a bit. But that is possible

DMAN. Was the before and after done on the same day?
If you didn't, was it cooler on the first run a few days ago? That my be why it showing so low.

Just my .02 cents

No they were done about a week apart.
It was actually a little cooler for the second run.

No they were done about a week apart.
It was actually a little cooler for the second run.

Thats Weird...Did you resent the ECU? (I keep wanting it to make more power than it is showing, lol)

Alrighty Fellas, wanna know what the results are?!?!

Here's the dyno sheet. The blue line is before header installation, the red line is after:
http://i70.photobucket.com/albums/i86/D_M_A_N/Scion%20Stuff/DynoResults.jpg

Before header 84.24hp & 85.80 Torque
After Header 88.62hp & 87.41 Torque

So... I gained about 4.38 HP. :eyebrow:

What do you guys think?

Yeah that top end looks nice and healthy.
pretty jagged looking line though. What's up with that?

nah, I didnt reset the ecu.
Immediatly after the install, I didnt notice the gain. After a couple of days, it felt like it kicked in, then I did the dyno.

I dont know why it's all jagged.
Could it maybe be that way because the graph is of hp in the 80's. If it were a 200+ hp reading it would look smoother because the graph resolution would increase. But I dunno :?
Would that matter?

I'm thinking about losing my cat

you know that would mean even less torque, right..?

i would acctually really like to see a dyno for 18 vs light weight 16/15 inch rims, maybe thats just me. :)

less torque? really? I thought it would free things up for exhaust flow?
I too wouldlove to see the diff between 18 & 15" wheels. I'm betting that it would look better on the dyno, and feel a HECK of a lot better too. I wish I didnt get rid of my stock wheels now :(

Yeah, free exhaust=less back pressure=less bottom end torque/more top end hp. Your peek torque might go up a bit, but that torque curve down low will be even worse. Hp will go up, I'm guessing 2-3hp

I just ordered some 16" konig feathers, 15.x lbs per rim. Should be in on friday or so, Im exited... Goodby heavy 18s!!

DMan, get that PM exhaust already and see what that adds! I agree on the stockies. I am hesitant on getting rims because I don't like the idea of slowing the already slow box down any more.

DMan, get that PM exhaust already and see what that adds! I agree on the stockies. I am hesitant on getting rims because I don't like the idea of slowing the already slow box down any more.
After about a year of having mine, I have to say thats a smart choice. less hp,mpg and breaking ability. Thought 18s look amazing on our boxes!!

dude i have some 17x7in rims weighing in @ a scant 14.5lbs.....so light even with tires they weight less than a buddy of mines 15x7 rims alone

I dont think it's so much the weight as it is the size on the 18's. I have superlight 18's but they still suck for performance, though they look better than smaller ones IMO.

Bigger wheels change the shift timing in autos, and it takes longer to get going. Less gas mileage too. I know there's some kind of equation you can use to get actual mileage out of oversized wheels, but I went from getting 32mpg with stock wheels to getting 22-25mpg with 18's. I dont think the equation will make up for 10mpg.

(I can't tell if your saying that the overall diameter of your wheel/tire package is bigger then stock?)

Anyway...It's 2 things: the bigger the rim the more weight farther out from the hub = bad for performance. And a heavier rim is worse than a lighter rim period.

Each pound you can lose off your wheel/tire package is like losing 10 pounds off the chassis.
On a M.T. Box each horsepower @ the wheels is pushing around about 26 pounds.

If you got some 11 pound rims you might be saving 10 lbs per rim!(x4) this would be equivalent to adding 15 hp @ the wheels.

It would show up on a dyno too.

I am suprised you are getting that kinda of milage, I have heavy 18s, I would say around 22-24 lbs. and I get around 28-30mpg.
Can wait to see what happens with 15lbs 16s!!

http://www.importtuner.com/powerpages/0406it_2003_scion_xb/

Im guessing no one else has been to the dyno...im lookin to take mine sometimes soon.
I got:
Strup header
Blitz axle back
Fujita short ram intake
Nology hotwires
Grounding kit (not sure if this does anything)

To the original poster: Is the header the only exhaust modification that you had? In other words, was it a header hooked up to a stock exhaust?

How does it sound? Any sound clips?

I am suprised you are getting that kinda of milage, I have heavy 18s, I would say around 22-24 lbs. and I get around 28-30mpg.
Can wait to see what happens with 15lbs 16s!!

Well, I am getting a consistant 2mpg more withthe 16s

To the original poster: Is the header the only exhaust modification that you had? In other words, was it a header hooked up to a stock exhaust?

How does it sound? Any sound clips?

I have a Volant CAI, and stock exhaust.
The sound didnt change after I put the header on, at least that I could tell. Maybe just a tad deeper. The majority of my sound comes from the CAI. With the box around the air filter it sounds pretty mean, but as we all know, is not :)

I am still waiting on my ram air scoop that goes from the fog light housing straight to the CAI box. That should help a little more on power hopefully.

I do believe my MPG sux more with this header. Or my foot might have gotten heavier.
Probably the latter.

That's exactly what I wanted to know, man. Thanks!

I absolutely loathe the way these cars sound with aftermarket exhaust systems. It's just not my taste. I was thinking about getting a header, but I didn't want it to change the sound.

i wonder what i can my numbers are on a dyno.......how much does it cost to dyno your car? im onlee wondering cuzz i can keep up with friends 95 Acura Integra LS that has I/H/E/ and a stage 2 clutch....i can pull on him from first to third gear then after third he starts to walk me and then when we start to near 100mph he just leaves me........its that same thing every week.......yea i race him every week