I'm looking into sourcing headers and was wondering if anybody knows of any dyno tests that may have been done from what is out there. Dc sports claims 18-20 hp just with headers (not sure if that's to the wheel or fly wheel hp), Rm claims 18.8 hp to the wheels coupled with their muffler, comptech doesn't mention anything at all. I guess overall peak hp is important but I'd like to see the entire picture with hp gains throughout. Does anybody have any good info or advise on these different headers or any other headers available?
headers
- Thread starter jon69
- Start date
Most of the well made headers are going to give you about the same improvement in hp at the wheels. I have the Comptech ones and they are beautiful pieces and really well made. Comptech also machines the flanges on the DC headers.
I do not know for sure, but I would guess that if you get the CT, RM or Dali headers you will see gains close enough that a dyno run would not show any real difference. Do not forget to consider materials when you chose your headers. SS vs ceramic coated, etc. Decide which properties are most important to you and pick the material that delivers that aspect best.
I do not know for sure, but I would guess that if you get the CT, RM or Dali headers you will see gains close enough that a dyno run would not show any real difference. Do not forget to consider materials when you chose your headers. SS vs ceramic coated, etc. Decide which properties are most important to you and pick the material that delivers that aspect best.
I really hope someone answers that last post. I have a muffler kit on my car(however I doubt it is a performance upgrade) I wanted to get an intake installed and even considered headers. But, once I saw the price for headers I decided it wasnt really worth it in terms of HP gains. I would rather use that money for other things. Maybe a brake upgrade. But just what difference in performance would there be for those with stock headers. Didn't Honda change the headers in '97???
Blade
Blade
see below.
[This message has been edited by justin hall (edited 08 February 2001).]
[This message has been edited by justin hall (edited 08 February 2001).]
Hopefully this works. Pulled this off the comptech page. Shows results with engine mods up to SC.
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Justin
'98 NSX-T Blk/Blk
o Comptech headers / exhaust / airbox
o Koni adjustable suspension w/Comptech springs and sway bars
o Volk TE-37 17/18” wheels
So how much hp does the Comptech header provide? The graph isn't clear enough to tell.
I agree with David that most well made headers, RM, CT, DC sport, and most Japanese ones gives the same amount of HP increase. Just pick the one that you have the most confidence in. I picked the Fujitsubo one for it's extra features and over the top quality.
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Please visit my NSX tuning page! Mods, Japanese NSX related stuff, pics!
http://www.geocities.com/Tokyo/Dojo/6073/index.html
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Please visit my NSX tuning page! Mods, Japanese NSX related stuff, pics!
http://www.geocities.com/Tokyo/Dojo/6073/index.html
I know it is an eyechart, but I posted it the only way I know how. I suggest checking the Comptech page if you cant read it.
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Justin
'98 NSX-T Blk/Blk
o Comptech headers / exhaust / airbox
o Koni adjustable suspension w/Comptech springs and sway bars
o Volk TE-37 17/18” wheels
I had a dyno on my Candy Cane car done with the OEM 1998 headers (before) and new set of CT headers (after) and with a stock exhaust and no cats the difference was +2-3HP. Clearly not worth the $ unless you are looking for every last HP. (we were) I'm sure they would have helped a little more if they had a decent exhaust to blow into. I'm also very sure that they would have produced a 10-12HP gain on a 3.0L that ships with the crap OEM cast iron slug.
YHPMV
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need more info? private me @
[email protected]
Mark Johnson, CEO of Custodial Services @ Dali Racing, a Not For Profit Company.
The headers seem to add horsepower and sound, but what a pain to install! I like the aftermarket parts I can handle myself.
Oh yeah, Mark just sold me some Eibach's so I guess I'll learn how to install springs!
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For more NSX content in your life, please visit www.nsxsc.com and the new NSXSC forums at www.nsxsc.com/bios
Oh yeah, Mark just sold me some Eibach's so I guess I'll learn how to install springs!
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For more NSX content in your life, please visit www.nsxsc.com and the new NSXSC forums at www.nsxsc.com/bios
Here is a comparison at the track. In October of 1999 I ran completely stock including Yoko A022’s. The following October I ran with CT Intake, Headers, Exhaust, and no cats (stock tires). The weather on both days was comparable. Through the 1/8th mile there was virtually no difference. By the ¼ mile, the modifications began to take affect, albeit only slightly. By the end of the ¼ mile I had picked up .1 seconds and 4 mph. This tells me that I traded low end torque for high end horsepower. This may indicate that 4.55 gears will have a significant affect. However, what I don’t know is what each modification individually contributed or took away. My gut feel is that the intake provided a ram air affect at sppeds above 85 mph and may have, by itself, provided the better top end performance. Keep in mind that static dyno tests do not show this ram air affect. Also, I wonder if the Intake alone would have provided greater performance all around (i.e. retain low end torque and increase high end power).
Distance-----Stock-----------I/H/E
60’----------1.91-------------1.96
330’---------5.39-------------5.45
1/8----------8.26 @ 84.38-----8.30 @ 85.73
1000’-------10.75------------10.75
¼-----------12.87 @104.55----12.84 @108.86
[This message has been edited by dswartz (edited 11 February 2001).]
Distance-----Stock-----------I/H/E
60’----------1.91-------------1.96
330’---------5.39-------------5.45
1/8----------8.26 @ 84.38-----8.30 @ 85.73
1000’-------10.75------------10.75
¼-----------12.87 @104.55----12.84 @108.86
[This message has been edited by dswartz (edited 11 February 2001).]
I think Mark is on target here.
1) The headers really don't reach full potential unless you free up the entire exhaust.
2) I think I got about 15-18hp on my 3.0L with my header and exhaust combo, but it was years ago and I don't have the dyno data any more.
Dswartz,
What tires were you running? Those are some killer 60ft times. Thanks.
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Jason
What tires were you running? Those are some killer 60ft times. Thanks.
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Jason
Jason, I use Stock Yoko A022's. I do 2nd gear burn outs until I see lots of smoke. Then, and only then, they stick like glue.
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