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Uncontrollable boost.

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suicidal2af

15+ Year Contributor
866
20
Jul 31, 2004
Bel Air, Maryland
Problem is just as the title says. I recently installed uicp, bov, and mbc. The mbc is home-made, but tested as working on a friend's 1g tsi awd. The problem is, I'm pegging my boost gauge if I go wot. Swapped out last night with another friend's TurboXS mbc, same issue. It's pulling hard once it makes over 10, but below that it feels like it doesn't have any punch anymore.

Only relevant information I can think of is that I have a boost leak. I can hear something leaking at partial throttle boost, quite loudly at that. Still reading over 15, despite the leak. Also, I do have semi-long vac lines. Line going from the T to the bov is the full hose GReddy includes, probably about 2 feet long. Line from the tee to the mbc is 2 feet long. Line from the mbc to the wga is only about 8 inches.

Anyone have any ideas? :/

Edit: prior to all this, it ran/boosted perfect when hooked up to the stock BCS.
 
Update: MBC disconnected, tee ran straight to WGA via vac line that was going to side port on mbc. Boosts to ~10, runs as expected.

Any ideas?
 
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