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ive got a gt15 turbo and i fitted a mbc a thru weeks back it shud be boosting 21psi but it gets too 16psi and then drops off and no matter how much i turn the mbc the boost just dont seem too get any higher and anyone help me a dont know if its a boost leak or the wastegate spring knackard
thanks
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Spray a thin washing up liquid solution over all your joints and give it some revs, any leaks should bubble.
If nothing shows then try replacing the spring.
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Sounds like a boost leak to me... pressure gets to a certain amount, some pipe / seal somewhere can't take it and opens up and lets all that lovely boost out!
JP
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As far as i'm aware you're supposed to wind the boost up manually and then fit the boost controller to REDUCE the boost.
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That's not right Kris... Keep it low on the gate, and then use the controller to up it.
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Yea if there's no smoke on boost then you need to up your max fuel this is why your only hitting 16psi.
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What turbo are you running mate? TD04?
Edit: Just seen GT15
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Oh fair do's, im going on how marks is fitted. What a mission we had getting that to boost over 7psi.
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bloody hell its gunner be nearly screwed all way in haha
STAGE2 XUD DEAD ATM ENGINE REBUILD
GARRET T2-BOSCH PUMP-GROUNDED LDA PIN-GOV MOD-FMIC-STRAIT THRU STAINLESS EXHAUST SYSTEM
COMING SOON TD04