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How do you know if you have a boost leak? What are some symptums?

 
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no boost

 
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but say you use to reach a 7psi and now ou only get to like 4
check your pipes

 
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well, it will hit 5psi, then it will drop down to like 4 or 3. It doesnt stay at 5 thru the whole rpm range....

 
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what's your fuel management?

 
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mf2....

 
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check all your piping connections. if youre running a manual boost controller that could be it. whats the wastegate set at? fueling wouldnt affect how much boost the turbo was making, if the engine is turning more rpms there is more exhaust gas.

 
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have a mbc,.... im running 5lbs

 
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Not really. Think about it. Your motor's exhaust powers the turbo. When you're filling the engine with more air, you have to add more fuel to burn the mixture properly. If you don't have enough fuel, the mixture won't burn, therefore there won't be anything to push the rpm's higher and you're car will stall and sputter.

If you can still push the engine to higher rpms, all the way to redline, it shouldn't be a fuel delivery issue, somehow the air isn't getting from the turbo to the intake, either by a piping leak, wastegate leak, leak from the bov or maybe the turbo is gone. It could very well be the boost controller as well. I would try to bypass the boost controller and run at the wastegate spring setting and see if it holds the boost all of the way through the powerband.

 
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im think MBC now but you should still check your pipes.
Your stock wastegate Actuator should be around 5 psi
the only thing that could raise it would be your boost controller unless you have an adjustable wastegate arm( which im assuming you dont)
Is is a Homemade MBC and did you ever get around to checking your pipes?

 
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When i was tesing it out the other day one of the pipes came off. When that happend of corse i was making no boost at all. Its a tail ext wastegate, it default is 4psi, but ive cranked it up to 5. It usual stays at 5psi untill like 5.5rmp and then 6 rpm it drops to 4psi. Its getting enought fuel.... Mabey too much, ill just take it back to the shop and have them look at it.

 
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how do you like the mf2?

 
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At first i didnt like it. But i read up on it and ive been tuning it myself. I like it! I would rather have something like a sf fuel set up tho, cause evertime you up the boost it has to be retuned, unless you have a wide band.

 
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Check the BFV.. I dunno how it works, but my friend's bov was ghetto rigged and he suffered from almost 5 lbs of boost leak.. he would hit about 15 and then it would slowly fade down to about 10-11 lbs.. He said the bfv was too lose and it caused it to leak out at high boost apps.

 
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Thanks for that info, ill see if i cant borrow someone elses bov to test.

 
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No problem.. What bov do you have?

 
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could be pressure drop from the intercooler. Im betting though its the MBC leaking.

 
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i had a really bad boost leak... i found out it was my boost controller... make just the ball and spring and screw are finely threaded and do leak out of the sides of the screw... make sure the bleeder hole on the boost controller isn't too big... try swaping your boost controller with someone elses for the day...

 
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Use silicone couplers on your piping connections and switch to a Hallman Pro Series MBC

 
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I i think i was having this problem before i got the boost controller though......... The bov is some generic brand from maxrev.

 
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Yea, it could definately be that then. If it's poor construction..well let's put it this way.. You get what you pay for Not knocking maxrev.. I like their kit.

 
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run a air compression test on it and u will find your leak