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NG900 & OG9-3 Performance, Mods & Tuning Covers Tuning & Performance modifications for the NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible

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  #1  
Old 8th June 2012
losacker losacker is online now
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Default less than 7psi?

ok so im having an issue. i have a MBC+A and i have been running it on 15 psi for a long while now and all of a sudden it wont boost more than 7 psi. i have tried turning the MBC up and nothing happens. i have the stock base intercooler and piping. i was thinking that since its the original piping i might have a boost leak from the rubber pipe since it is old and has some cracking. my thought was also on the waste gate. is there a way to rule out certain things to know for sure? any help is greatly appreciated. thanks!
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  #2  
Old 9th June 2012
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check your diverter valve ("blow off" valve)
it's probly the culprit
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  #3  
Old 9th June 2012
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Originally Posted by grkguy89 View Post
check your diverter valve ("blow off" valve)
it's probly the culprit
i hate to ask but how do i go about checking that lol. pull the vacuum hose off and plug said hose up and see if it boost fine? or should i take it off and is there a way to clean it? this could be a long lasting problem and it finally fully gave out. i wasnt seeing full boost(15psi) till about 3k. i have a cat delete and my MBC running 93 of course. stock tune and everything else is stock. THanks for the help! this is why i love this forum, you get a straight answer and people arent trying to troll (too much at least lol)
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Old 9th June 2012
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can you hear a whistling or a honking then it is the diverter. if so and you have the original Bosch then you need a new one
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Old 9th June 2012
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right on the money sir. i have recently heard a loud honking when i wouldnt fully let out of the throttle and i thought it was just the perfect pressure and opening to make that sound. i believe it is the original bosch diverter valve so that would be the issue i believe. thanks for your input. it is all greatly appreciated. once i put a new one on i will make sure that is the case and get back to you guys. thanks again
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  #6  
Old 9th June 2012
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happy to be of help
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Old 26th June 2012
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so i installed a new diverter valve and i am still getting the same problem and this valve, it is brand new, is also honking, what are the chances of having two bad valves in a row?
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  #8  
Old 26th June 2012
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it is def possible that it is bad if it's honking
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Old 26th June 2012
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damn. im really starting to get frustrated, i have a greddy type rs bov but the piece i recived with it is about 2" instead of 1", is there a reducer or could i find a 1" with that flange at the auto parts store?
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Old 26th June 2012
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you might be able to get a rubber hose with the reduction you need
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Old 26th June 2012
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would that be at an autoparts store or a hardware store?
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  #12  
Old 26th June 2012
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either or... probly a better chance at an auto parts store
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Old 26th June 2012
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Quote:
Originally Posted by losacker View Post
damn. im really starting to get frustrated, i have a greddy type rs bov but the piece i recived with it is about 2" instead of 1", is there a reducer or could i find a 1" with that flange at the auto parts store?
You could always have a shop weld a 2" ring onto the pipe to accept the new BOV.
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