Boost problem

[samlloyd]

My rb30det isnt boosting as much as it was a few days ago. Under WOT it wont go over 1Bar, when it would normally see 1.2

All intercooler hoses seem ok, and it idles sweet (once warm)

Any ideas?

[79rolla]

wast gate actuator?? turbo dieing?? a hoes poped off somewhere??

[MR2SIK]

is the vacuum showing the same as usual on the gauge? if not it could just be the hose for the gauge springing a leak, happened to me once. spent ages trying to find a non exsistant problem

[samlloyd]

Vacuum doesnt appear to be out of the ordinary.

I dont think a hose has popped off as this would cause an irratic idle.

Turbo dieing could be a possibility, but the shaft still feels ok.

Wastegate actuator feels fine, and can only open once there is enough pressure there.


I feel there is a leak only when under boost. It sounds kind of like an external, but with air more then exhaust. I will check all the exhaust flanges aswell. But for it only to be doing it when under high boost.

(you can only hear it leak at about .9 Bar)

[Twolitre]

Common problem with Rb's apparently is broken exhaust manifold studs causing an exhaust leak. Look for traces of carbon around your exhuast manifold and exhaust housing flanges.

[samlloyd]

You would think that the exhaust leak would be all the time, not just when its under full boost. But i wll check, thanks

[samlloyd]

Looks like ive found it, the screw in the top of the blitz BOV has gone walkabouts. Now, where to find a replacement