Test or Cat Pipe increase in HP
09-13-2002, 04:41 PM
#1
Racer
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Test or Cat Pipe increase in HP
I know this topic has been beat to death but I searched rennlist and can't find the answer to my (probably simple) question.
How much HP increase can I look for if I have a cat pipe installed? I understand it depends on how old and "clogged" my current cat pipe is. My car has 39,000 miles on it.
Also, can someone tell me the difference between a Cat pipe and a Test pipe or are they one and the same?
My mechanic says he'll charge me about $350 total to put the pipe in.
10hp? 5? What do you think?
How much HP increase can I look for if I have a cat pipe installed? I understand it depends on how old and "clogged" my current cat pipe is. My car has 39,000 miles on it.
Also, can someone tell me the difference between a Cat pipe and a Test pipe or are they one and the same?
My mechanic says he'll charge me about $350 total to put the pipe in.
10hp? 5? What do you think?
09-13-2002, 06:54 PM
#3
Racer
Join Date: Apr 2002
Location: Lenexa, Kansas
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Call <a href="http://www.huntleyracing.com" target="_blank">Huntley Racing</a>. They can answer all your questions. But remember...bigger is better!! Spend the extra few dollars and get a three inch pipe!!
09-13-2002, 08:24 PM
#4
Race Director
"Also, can someone tell me the difference between a Cat pipe and a Test pipe or are they one and the same? "
One and the same. I guess "test pipe" was a politically correct term to use when you talked about it since you'll be using it to "test".
When I replaced my entire exhuast from the downpipe back with a 3" system, I gained about 1.5psi of boost. Turning that back down to 15psi still gave me less turbo-lag and the boost stayed up in the higher-RPMs.
As for a comparison, check out Steve's Coopers dyno-chart from last weekend's dyno session: <a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=010896" target="_blank">NorCal Dyno Day...can ANYTHING be more fun than this?!</a>
He got 256rwhp/278lb-ft torque using our Stage-2 MAP kit and catalytic in place. Our car is configured identically but with a cat-bypass and got 261whp/303lb-ft torque. So the difference is about 5rwhp and 25lb-ft torque. Less HP increase than torque because the stock turbo starts running out of steam in the higher-RPMs.
One and the same. I guess "test pipe" was a politically correct term to use when you talked about it since you'll be using it to "test".
When I replaced my entire exhuast from the downpipe back with a 3" system, I gained about 1.5psi of boost. Turning that back down to 15psi still gave me less turbo-lag and the boost stayed up in the higher-RPMs.
As for a comparison, check out Steve's Coopers dyno-chart from last weekend's dyno session: <a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=010896" target="_blank">NorCal Dyno Day...can ANYTHING be more fun than this?!</a>
He got 256rwhp/278lb-ft torque using our Stage-2 MAP kit and catalytic in place. Our car is configured identically but with a cat-bypass and got 261whp/303lb-ft torque. So the difference is about 5rwhp and 25lb-ft torque. Less HP increase than torque because the stock turbo starts running out of steam in the higher-RPMs.
09-13-2002, 09:11 PM
#5
Unaffiliated
I won't promise any HP increase, but I KNOW I did two good things when I went to a test pipe. I shed about 20 LBS and opened up the flow of FLAMES out my tailpipe when I shift near redline, especially noticable between 2 and 3, at night...
You got to love a car with AFTERBURNERS...
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
You got to love a car with AFTERBURNERS...
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
