99 saab 9-3 mbc help - SaabCentral Forums
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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 October 2009
saab93t99 saab93t99 is offline
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Default 99 saab 9-3 mbc help

Ok so i put a turbo xs mbc on my 99 9-3 and i cannot get it to turn the boost up, i know how to use the controller and ran new vacuum lines and it just wont increase pressure, when i first bought the car it was running 10psi in 3rd-5th and once i hooked the mbc up i cant get it past 5psi? I have tried a diffrent mbc as well, is there maybe a wastegate problem?
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  #2  
Old 8th October 2009
Cm452 Cm452 is offline
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Disconnect the wastegate hose from the BPC, if it still doesnt hit fuel cut, then you know there is a problem with the wastegate. if this proves fine, then you know you didnt hook up the MBC properly. 5psi is base boost, which means the wategate is not being controlled by an outside source-only the spring within it.
-Cm
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  #3  
Old 8th October 2009
Cm452 Cm452 is offline
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Oh, also check for leaks in your intake manifold, that could also severely limit boost.
-Cm
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  #4  
Old 9th October 2009
saab93t99 saab93t99 is offline
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ok so just unhook the vacuum line from the wastegate to the mbc? i will check leaks tomorrow i am not a big saab guy i love the car but have never worked on one so im not sure where to check.. Thanks alot!
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  #5  
Old 11th October 2009
saab93t99 saab93t99 is offline
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anyone else have any suggestions?
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  #6  
Old 11th October 2009
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What happens when you take the mbc out and go back to stock, does it boost to stock values? If so then your mbc is hooked up wrong.
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  #7  
Old 12th October 2009
mr rx-7 tt mr rx-7 tt is offline
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Read the MBC directions, on some cars you have to shim the MBC. Is this a SPTL MBC?
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  #8  
Old 19th October 2009
saab93t99 saab93t99 is offline
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i took is back to stock and stil no change, i know the mbc is good and hook up corrctly i had it set to 10psi on my civic. The saab was boosting 8psi 1-3rd and then 11psi 4-5th gear when i first got it. I do not know what is going on with it. I ran new vaccum line to the wastegate and still nothing its only boosting 4-6psi depending on temp.
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  #9  
Old 19th October 2009
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Something is way wrong with car, if it was base boost then you would hit that value (6) and be able to sustain it all day for the most part. Do you have any cel's? Do you hear any escaping air, and how is the dump valve?
Did you follow cm452's advice?
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  #10  
Old 20th October 2009
saab93t99 saab93t99 is offline
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dont know where the dump valve is located and not any boost leaks that im aware of, i have no directions for the mbc.. i will check over all my pipings today
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