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| Forced Induction Discuss Superchargers, Turbos and other FI Setups. |
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5th July 2008, 04:21 PM
| #1 (permalink) |
| Senior Member 3,000rpm (Grandma Drag)  Join Date: Dec 2004
Posts: 284
Location: Christchurch  | Boost not going higher than 2 psi.. Probly a noob question but had a quick search and couldn't find anything. My mate just got a new car, its a Bluebird with a CA18det and the boost is stuck and 2psi...it has a boost controller and adjusting it does nothing, he even tryed free boosting which done nothing, just stayed at 2psi. Any help would be cool, Cheers. He just wants to know what its most likely to be causing the problem, he just wants to run it at factory 8psi...
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5th July 2008, 04:28 PM
| #2 (permalink) |
| Senior Member 4,000rpm (Taxi Drag) Join Date: Jan 2006
Posts: 730
Location: Auckland | Re: Boost not going higher than 2 psi.. Wastegate stuck open..
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5th July 2008, 05:11 PM
| #3 (permalink) | |
| Senior Member 8,000rpm (B Series Redline!)  Join Date: Dec 2005
Posts: 5,617
Location: Carterton | Re: Boost not going higher than 2 psi.. boost actuator arm moving? id say the wasteyougate is stuck partially open
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5th July 2008, 06:02 PM
| #5 (permalink) |
| Senior Member 9,000rpm (S2000 Redline!)  Join Date: Nov 2004
Posts: 6,739
Location: Levin | Re: Boost not going higher than 2 psi.. stuffed turbo?? leak in the pipes somewhere?? vacuum lines not hooked up??
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5th July 2008, 07:21 PM
| #6 (permalink) |
| Senior Member 3,000rpm (Grandma Drag)  Join Date: Nov 2005
Posts: 246
Location: Palmerston North | Re: Boost not going higher than 2 psi.. Boost leak or wasteugate is leaking hard!
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14th July 2008, 04:31 PM
| #7 (permalink) |
| Senior Member 6,000rpm (Max Torque)  Join Date: Apr 2005
Posts: 2,252
Location: Hamilton | Re: Boost not going higher than 2 psi.. Its easy to problem to solve... the boost is either not being made or it is venting somewhere. Start simple - check all the intercooler pipes - make sure none are disconnected. Check blow off valve and see that its not broken or a vaccum line is not disconected and venting boost straight out. Check everything all the way to the manifold for leaks. If that does not solve the problem the next likely cause is the exhaust gas is bypassing the turbo - usually from the wastegate or actuator - either being stuck open - remove and/or check that the actuator is closing and opening or possibly if running an external it is missing the steal O ring - remove and check. Failing this the turbine wheels may be damaged -
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