Trouble Over 300rwkw With Rb25det

[MR331307]

Hi guys,

I was just wondering if anyone has experienced trouble once getting over 300wrkw with an RB25DET. The engine has enough mods under the sun to support it but once you start to run a fair whack of boost(~1.5)the power just drops off after 4500-500rpm thought it was spark so we put in a CDI and didnt seem to help. it seem to be pointing to weak valve springs springs but it has tomei springs, only standard cams though, runs approx. 8.7:1 compression and a 107 or 109 RON fuel. Anyone got any ideas?

Has anyone every had trounble with there VVT/VCT or whatever its called?

Any thoughts would be helpful thanks fella's

Cheers

Luke

Ive found the Tommie springs to be shit house as well

same as there cams when ur reving the engine

anyways

sounds like the timing is dropping out

What Ecu

What turbo

What intercooler

What Injectors

What AFRS you running