Stock vs Aftermarket Exhaust/Header Dyno question

Joined
25 October 2001
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Location
Northern California
Reviewing the Comptech Dyno results for headers and exhaust(on their website where they used a 2000), I noticed that with the stock exhaust one gets more rwhp below 5400 RPMs than Comptech's - thus more torque too right?

Headers and exhaust together improve rwhp across the entire RPM range. Intake seems to have little impact until you get to about 6400 RPMs with both headers and exhaust.

Note, I am not fixated on the exact rwhp numbers but more on the pattern. We know that for the 3.0L, the header and exhaust will be an improvement when done separately.

My question for 3.2L:

1. Do all after market exhausts for 3.2L exhibit the same drawback of less rwhp below a certain RPM when compared to the stock 3.2L SS exhaust? Teitec (GT Parallelor JGTC parallel); RM, Finstar, Dali SS, Tubi, GruppeM, Borla ......?

2. Do all exhausts for 3.2L exhibit more rwhp after a certain RPM presumably VTEC range ....?

3. Since the exhausts and headers seem to give higher rwhp across the entire range - for a 3.2L [a marketing pitch for Comptech here], does anyone else provide such a combination of headers and exhaust with Dyno result showing improvement across the entire range for a 3.2L? I am not looking for a Mugen price answer in here .......

Please no guesses, I am looking at factual info, preferably substantiated with Dyno numbers ....
 
Hey Hrant,

I got to drive a 97-T last Friday around Thunderhill. I got to say, what chassis flex? The car has un-tuned Tein RA, and bunch of oversteer. By the end of the day we were able to dial most of it out. But it will have to go back to alignment machine, and different ride height, and possibly different sway bars as well.

The 6 speed is awesome. Definitely a mod worth of doing for 3.0L cars. I was able to turn in 2:17 which is about 3 sec slower than my car (with street tires). Considering the un-tuned suspension, and the fact that I have to shift at 6500rpm (overheating problem, the temp. get hot within 1 lap), I am pretty impressed with the 97s. If it propery tuned, targa top or not, I can comfortably say it should be faster than the 3.0L around thunderhill by a good .5 sec per lap.
 
Yo Andie,

If you wanted to drive a 3.2L, all you had to do was ask .......... all this time you have been bragging with a 3.0L only .......
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2.17 is pretty good number with stock tires. I am sure the Tein will make a big difference.

I am still trying to dial mine now with Bilsteins (lower perch) and Comptech sway bars; stcok springs and tires/wheels. The ride is a good 30% stiffer than oem T and I think I would not want to push it more on a T if street driving comfort is also important which it is for me ...... springs might be an option for some. From what i understand, TEINs are stiffer than Zanardi and no one is recommending dialing them at the soft setting ......
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The Bilsteins made a big difference; the nose does not dive as much now upon braking .... but have not been able to capitalize on it yet; my rears still seem to be a little loose with neutral setting on the sway bar. Will either soften the rear sway bar or tighten the front a little, not sure which way to go.

I too had some heating in June where the ambient temp was mid 90F; the water gauge got to 2/3 after 3 laps - that is comparable to one lap with your driving ....
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but I have the Dali radiator shield with the original smaller holes ..... glad I had the shield though ..... too many insects/bugs and loose rubber ......

Now back to the original question ..... exhaust/header dyno results ......
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