I have not got the data file yet from Rosen so I can't get the specific numbers at each rpm. Corey's car has only the AEM intake and header. Not sure the last time it was tuned up though. We will be doing a mod to the intake after this race. I'll post a new picture when I get the data file so it will be easier to read. Corey just took a picture of the dyno sheet. Peak HP was 177.4 and Torque was 139.7. For some reason the runs were only made to 7200. From how it looks the HP would be higher at 7600. Are all these ECUs the same?



The following added for clarity






Modified by SMSP at 1:09 AM 3/14/2004

 

On the last run, i took it all the way to fuel cutoff, an indicated 7900 on the tach, but 7,500 was recorded by the dyno.. Shows how off the tach is..

Car has had a lot of track time since tuned, needs valve adjestment, and the dyno was done at a stock +15 timming, and a couple nice dents in the small diameter AEM intake (thanks to the strut bar)

 

wow, that's still very impressive for a car with only an intake and header.

is the car running a stock exhaust? or open?

not bad considering this is the first prototype.

any in-depth thoughts as to where the design of the header could improve the numbers even more?

 

[QUOTE]is the car running a stock exhaust? or open?QUOTE]

It has a 2-1/2" exhaust with a 18" resonator, I wouldn't expect much of a difference when running a full 2-1/2" exhaust with another muffler at the rear. Some tuning of the length of this exhaust may help for the track.

Next header will be a 4-2-1, I haven't finalized the drawings yet on the layout and tube sizes.

 

you should try it with open 2.5"OD piping and 2.375" piping to see if the 2.5" is tooo big for the flow of the H22a

Mugen determined that 60.5mm i think was the best piping isze of the S2k engine wich flows just a tad more in the higher rpm than our 2.2
but that's jsut mugen

good numbers neway..i would've liked to see what difference the header made exactly though

like with and without the header
cause we can't see how it incresed from the base run

will you have bigger pictures of the dyno sheet ?
cause cna't see much at that size
eheh

cool stuff neway..good work

 

jinmtvt, actually if you look on alaniztechnologies.com the s2000 head flows way more then our 2.2 at the top end. they have a bench flow chart on the site.

 

VERY impressive #'s for so few modifications and a prototype header. Do you have any idea what baseline was? Most G5 base models tend to show ~158-165 in stock configuration...

Paul

 

No baseline done. Corey will need to go back with the DC header.

 

I really have no clue about the baseline of this motor.. It would be nice to test headers back to back, but would have to remove the subframe to do so... =~(

 

interesting stuff

but that's head flow..not combustion flow

 

can't you let the subframe there and just install the stock header or wich ever you have ..

maybe u have to remove the subframe to let the header pass ?
what is your feeling about the header

 

Header, well, looks great, shows good on the dyno, but havnt tested it because, well, its not a street legal car... Might take the car down a local backroad, if I can find my earplugs...

 

I am finding the H22A*s just do not dyno as high as those silly super-high-reving B18C5s. Close to 180 is very impressive for an otherwise stock H22, and we make decent torque down low!

 

impressive for a prototype. most people dont hit those numbers with i/h/e/manyothermods/etc. do you think a 4-2-1 will be a big loss in power?

err its that loud? thats cause of the non existent cat right? not cause of the header/exhaust i hope

 

No predictions on the next header which will be a 4-2-1.

The exhaust is loud since it only has a resonator and it dumps right under the driver. Hey it's a race car.

 

that might leed toa big differences in the "street" cars compared to this specific car..
we all know that the cat is a bottleneck and the stock muffler is ****

Corey: that means that if you would raise your CR to let's say 11.0:1 with S pistons or sich..you would be at near 190WHP
that's a pretty good mark i think

 

yeap, and I couldnt resist anymore, I took the car down the local backroad...

OMG! It is seriously a different car
Punch the throttle while rolling and get ready for some wheelspin, grab second, wheel spin.. Was it the cold tires? who knows, all I know is it didn't do that before.. Also, power does not fall off, before I found myself shifting at a indicated 7400 because the car would seem to loose power after that, now it pulls hard all the way to rev limiter, an indicated 7900... 120 never came so fast...

Corey, who wants to take the car to the local 1/8 track tomorrow....

 

lets see how the 4-2-1 turns out ,maybe less top end but better low and more TQ

 

baseline please but nice power

 

sweet

 

Good to see it developed... but I am suprised to see the torque that low... hmmm... perhaps some tuning? Although I don't know what the modification limitations are for you though.

 

pretty impressive.

 

yay, dyno!

 

Believe it or not, the F22 seems to always dyno with higher torque than the H22 (greater stroke or something). The H22 never gets HP numbers like the crazy RPM B18C5s. These numbers are very impressive for a totally stock H22... the perfect balance of the F and C... low down torque with a crazy top end!

Edit I meant the F22 has the greater stroke, lots more stroke:
bore x stroke
H22A4 87.0 mm 90.7 mm
F22A6 85.0 mm 95.0 mm



[Modified by 4doorH22, 8:50 PM 4/17/2002]

 

yeah now that i think of it the torque is kinda low. maybe too much flow? lets see how the next version does