I have a 97 GSR with Greddy Turbo. With the boost at 8 pounds everything is fine. But at 10 pounds the boost drops gradually from 10psi at 4000 rpm to 8psi at 8000 rpm.

Two things might explain that problem.

1- tiny 2" downpipe with 2.25" exhaust. (cat removed)

OR

2- Too much overlap... -i'm still using the stock cam gears

Wich one of these 2 choices can cause my problem? maybe both? or something else?


[Modified by meanteg, 6:00 AM 11/1/2001]

 

your engine effeciency may be the cause of your problem
valve overlap is out of the question
have you tried re-installing the cat?
that "greedy" kit was designed for cat use
you may be lossing too much back pressure
good luck

 

by the way contact "GREEDY"
that turbo is internally/integrally regulated
the waste gate may be set for less than 10 psi