typexero

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?

0mtber

iTrader: (2)

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....

typexero

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.

street_ride14

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.

Silva Bullit DC4

Mine falls off like crazy, too. My numbers are in my sig, but I have that same mani and DP. Time for a ramhorn!

typexero

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