Originally Posted by AJAYJAY

Car went into evo r for turbo, headers, up pipe and tune, car came out making 257hp with just under 400nm of torque(cnt member nm correctly). Havent had a chance to open it up yet as traffic busy as aswell.

Yes some people might say 20g housing is big for a 2ltr but the car is purely set up for the drag strip (RAC track days not my thing) as ill be going down a lot now to race and also apart of Vince Belladonna 6sec torana pit crew.

But boost starts to build up around 4000rpm and dies just before 7500rpm according to the dyno sheet

but once again big thank you to mao and warrick for the tuning and labour, and Wayne (JDM style) for the headers and up-pipe!

Originally Posted by mao

To put it simply, almost zero vacuum registered on the dyno which means valve timing is off. A simple listen to the engine even at idle is a dead give away, you can hear the mis-timing.

Even mentioned if there were cams on the car, did not get any info.

Another thing that can cause this is bent valves.