WOT then power loss

[jdmturtleracin]

ok guys... new to DSM's here... i have a 1997 GST spider... this is what's happening.... when half throttling it the car moves fine... but once you hit WOT the car just falls on its face like it lost all power what-so-ever... car's modded with a Greddy SP exhaust, and IC piping with HKS downpipe and SSQ BOV... i want this car to run right again finally... please help me out fella

frankie

 

[ECLIPSE4x4]

Have you done a boost leak check?

 

[jdmturtleracin]

boost leak checked and done.... i mean half throttle i'm able to reach almost full boost in higher gears...but once WOT comes along....the car would rush up in speed til about 4-5k RPM and then just fall on it's face...it feels like the motor just turned completely off, RPM drop and high hessitation and it gets really rough in the higher RPM's...

 

[TurboGeoff]

most likely its a before-turbo exhaust leak.

 

[ECLIPSE4x4]

You haven't UP'd the boost have you?

 

[SpoolnTsi]

Sounds like you may be hitting knock