Silvia Club of NSW

Hey i just fitted a highflowed T28 BB with a T3 turbine and now it wont boost over 5000rpm at 12psi. I already have the S15 VVT engine and running a microtech LT8 comp. any help will be greatly appreciated as my only other option is to take it back to croydon. with another chunk of my bank account missing..... thanks.....

wastegate actuator could be dodgy / leaking, or the pipe to it might be leaking somewhere.

Also, since the actuator is held shut partly by boost pressure , if there's a large enough drop through the intake piping / cooler, etc then it could be opening slightly.

_________________
The Engine Whisperer - fixer of things

hmm.. he won't be happy if it is the actuator... he just replaced it recently!...

[quote="DumHed"]wastegate actuator could be dodgy / leaking, or the pipe to it might be leaking somewhere.

Also, since the actuator is held shut partly by boost pressure , if there's a large enough drop through the intake piping / cooler, etc then it could be opening slightly.[/quote]
yeh i just replaced the actuator last week so i really dont think its that. The boost just drops to 0 when it hits 5000rpm

ahh.. could be fuel cut..
that'd be about the only way boost will totally drop at a certain rpm..

_________________
The Engine Whisperer - fixer of things

are you using the standard s15 boost valve thingy? if so take it out, i had the same problem. i had full boost instantly then it dropped past vacuum!

_________________
What you had? Reach for the lasers. Safe as f**k!

nah mate.. his using one of those turbo XS bleed valves... so dun think it's that...
I reckon it's gotta do the with the comp tunin..

thanks guys i took it to croydon and they found the problem it was my fuel pump maxing out and my standard airfilter pipe sucked closed when i rev above 5000rpm so i have to go the stainless one now....

that pipe should have a spring inside so that doesn't happen. anyway its good you fixed it

_________________
What you had? Reach for the lasers. Safe as f**k!