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Old 01-04-2009, 07:49 AM   #1
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Default Test pipe or high flow cat (Turbo b18b)

I took my car to the dyno for tuning and with 9 psi I got a maximum of 200 whp and 177 tq. However, the torque is 177 lb-ft at 5000 rpm and goes all the way down to 120 lb-ft at 8100 rpm. My question is: is my high flow cat the cause of the dramatic loss of torque? Do you guys think it's worth putting a test pipe in instead?
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Old 01-04-2009, 09:47 AM   #2
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Default Re: Test pipe or high flow cat (Turbo b18b)

Give us every detail of your setup.
I.e. turbo manifold, turbo size, intercooler piping size, intercooler size, downpipe size, exhaust size.

Post a dyno sheet too....
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Old 01-04-2009, 10:35 AM   #3
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Default Re: Test pipe or high flow cat (Turbo b18b)

Quote:
Originally Posted by mtber View Post
Give us every detail of your setup.
I.e. turbo manifold, turbo size, intercooler piping size, intercooler size, downpipe size, exhaust size.

Post a dyno sheet too....
The turbo manifold is a log manifold from Spoolin performance. The turbo is a GT2871R with 0.63 AR. The intercooler piping is 2.5". The downpipe is 2.5" and the exhaust is 2.5". I don't have the dyno sheet. I'll post it if I can find it.
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Old 01-04-2009, 10:46 AM   #4
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Default Re: Test pipe or high flow cat (Turbo b18b)

You bring a great example of how log manifolds hurt performance in all rpm ranges exp in higher rpm'. Post a dyno sheet if available. I blame your log manifold for the tremendous drop in torque at the end of your powerband.
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Old 01-04-2009, 11:00 AM   #5
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Default Re: Test pipe or high flow cat (Turbo b18b)

Mine falls off like crazy, too. My numbers are in my sig, but I have that same mani and DP. Time for a ramhorn!
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Old 01-04-2009, 11:26 AM   #6
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Default Re: Test pipe or high flow cat (Turbo b18b)

Thanks for all of your input. My tuner also said the log manifold may be the culprit. Just wanted to make sure.
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