Help! Boost Problem....

santa · 09-02-2004

well heres the deal my friend has a 92 6 bolt he has a rewired pump 3inch apex-i exhaust and a 02 dump and the new cast slow-boy exhaust manifold the turbo has some slight shaft play. and a turbo xs 1 stage boost controller...has new plugs wires coil pack ....well it will not boost over 10psi no matter what.... mike (raptor) at qpr thought it might have been a broken spring in the acuator so I put my acuator on and nothing changed mine is fine... there are absolutly no boost leaks and idk it started ever since he put the 02 dump on.... but the thing is if you boost above 4000rpm. it will creep slowly up to 14psi but thats it...the exhaust housing has no cracks the flapper is intackt and working right. all I can think of is possibly that the 02 dump pipe itself is not large enough but even that doesnt really add up eather... so any bright Ideas would be great so the kids car can feel quick again. ohh its a 14b also btw.

Thanks :jammin:
Kevin :bowdown:

TheBlizzard · 09-03-2004

Kevin, have you tried to just unhook your boost controller? And run unlimited boost...? If you haven't try that, you might have a shitty boost controller. Then atleast you can narrow it down to being the turbo or something else, maybe your turbo is fucked and can't boost above that, who knows?

CRAIG

santa · 09-03-2004

yeah I pulled my controller and put it on his car and there was no change. its weird as hell... Im stumped so are all the master tech's at work here too...anyone have anything else i should try? sorry i didnt put that.

john · 09-04-2004

Measure the size of the dump. I have seen several dump tubes that are smaller than stock. I had one and I believe Nash had one. That may have been why I had so many creeping issues on my 16g.

Nash · 09-04-2004

Is the wastegate flapper stuck open?

1Fst14B · 09-04-2004

WG acuator rod fall off?

santa · 09-05-2004

nope its all on

MATCHBX · 09-05-2004

This may sound stupid, but, is the boost controller hooked up properly (proper port going to proper hose)? Sounds like the BOV is acting as the boost controller. Isn't the stock BOV spring basically set to 10psi? Or do I have that backwards????

santa · 09-07-2004

it hooked up right also checked that too... man this is hopeless lol