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lopez82g
Joined: 15 May 2008
Posts: 12
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 Posted: Fri Jun 06, 2008 2:26 am Post subject: help |
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| okay i have wierd stiuation on my 90 1g Gst recently when I am wot and boost is good but it goes passed 20lbs and i do have a mbc It popps and flames come out this recently happened becuase had stock exhaust and when i would wot my mbc would stay at 12lbs and it would not pop but now I have a stock down pipe test pipe and a 3inch side exhaust with no muffler is my mbc broken. I don't want my boost that high i want it around 13-14lbs I know it mught be popping and getting fuel cut becuase to much boost on stock injectors with 255lph fuel pump. Any ideas on if it is a bad mbc or is it becuase boost creep or what i am stumped. |
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hdoerr
Joined: 14 May 2008
Posts: 15
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| Posted: Fri Jun 06, 2008 3:10 am Post subject: |
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To begin you have to check to make sure that your MBC is working. To do this you must turn it all the way out basically causing your waste gate to run manifold pressure. Complete a couple of pulls and let us know the results. A logger is a very cheap but super effective solution for situations like this. Please try to use more punctuation and spell check, Thanks.
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lopez82g
Joined: 15 May 2008
Posts: 12
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| Posted: Fri Jun 06, 2008 1:30 pm Post subject: |
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| mbc does no work and sorry didn't know i missed spelled so many words to many beers last night lol i have a logger but it messed up i need a new one |
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hdoerr
Joined: 14 May 2008
Posts: 15
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| Posted: Fri Jun 06, 2008 3:45 pm Post subject: |
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What you need to do is bypass the MBC outright and run manifold pressure until you get another MBC. Not sure what gate you have but that is the only other way to control boost.
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DSM_BOY
Joined: 14 May 2008
Posts: 19
Location: Austin, TX
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| Posted: Fri Jun 06, 2008 4:51 pm Post subject: |
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Its either one of two things:
1) Broken/Stuck Wastegate; its not opening to let out boost,
2) Boost creep.
If your wastegate is not opening then a MBC wont do any good because its only going to turn up boost past the WG spring.
I suggest checking both, If you have a compressor, hook up a vaccum line to the wg nipple and check to see if the arm moves back and forth, if it doesnt move, then thats your problem,
You can also test your MBC by putting it inbetween the compressor and WG while opening and closeing the spring...
If you dont have a compressor you can also use an air pump at any Gas Station
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lopez82g
Joined: 15 May 2008
Posts: 12
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| Posted: Fri Jun 06, 2008 6:56 pm Post subject: |
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| cool i will try that thanks dsm_boy you going to that dsm meet june 21 i will be there to meet some new peeps |
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DSM_BOY
Joined: 14 May 2008
Posts: 19
Location: Austin, TX
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| Posted: Fri Jun 06, 2008 8:01 pm Post subject: |
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No im not going to be able to make this meet
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lopez82g
Joined: 15 May 2008
Posts: 12
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| Posted: Fri Jun 06, 2008 8:53 pm Post subject: |
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| hey i fixed the problem it was the freakin rubber hose from mbc to wastegate it was cut so thats why i couldn't control boost but thanks to all for the help |
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