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#1
12-13-2005, 06:55 PM
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MBC leaking
alright i searched and couldnt find an answer for this
i have a turboxs standard mbc i did a compression test today and i had a tiny leak where the intercooler pipe connects to the intake manifold but, i had a very big leak on my mbc. it has 2 rubber round gaskets that go on the outside ridges of it, and under one of them it has 2 machined holes in it, and thats where all the air is coming out my question is= are mbc's supposed to leak, and if not, should i buy a new one or what?
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The Real Deal Apexi N1 Exhaust, Apexi GT Downpipe, GREDDY Type-S BOV, Dejon Intercooler Pipes, TurboXS MBC, Injen Intake, JL Audio 
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#2
12-13-2005, 07:10 PM
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Re: MBC leaking
Quote:
I have the same one, now I am curious as to if mine is leaking. But to answer your question no they are not supposed to leak. Try http://www.joepmbc.com/ Good MBC's for a good price I think I might pick one up as well. I have a feeling this MBC might be the cause of my boost problems. In fact as I wrote this I bought one. If anyone would like my old turbo xs one send me a pm and You can have it.
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1991 GSX 2.3 Stroker
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#3
12-13-2005, 07:32 PM
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Re: MBC leaking
My Turboxs boost controller leaks too and I thought about buying a JoeMBC. Maybe they are supposed to let air off to control the boost? Although mine wouldn't change the boost at all so its pretty pointless.
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-Brian
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#4
12-13-2005, 08:20 PM
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Re: MBC leaking
Hmmmmmm.... leaky Turbo XS BOV's and MBC's? Red flag there, thanks guys. I would have to second the JoeP MBC, Mike got one. Hes a nice guy and great product. Thats whats going on my DSM when I get one.
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 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#5
12-13-2005, 09:31 PM
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Re: MBC leaking
I believe the Turbo XS MBC's are bleeder valves, so they bleed off boost to raist boost levels. You want a ball and spring type of boost controller, such as the JoeP.
I have a JoeP and I don't creep at all, even with an unported evoiii. Very good and cheap BOV
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now - 2000 civic soon - 2002 is300 
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#6
12-27-2005, 01:30 AM
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Re: MBC leaking
All modern MBCs are ball and spring, including the turboxs. They will also ALL have a hole between the valve and the wastegate actuator. It's there so the WG can close
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Kevin Jewer RWD Talon - 7.92 at 180 Mightymax - 10.7 at 125
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#7
12-27-2005, 01:35 AM
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Re: Re: MBC leaking
Quote:
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-Brian
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#8
12-27-2005, 01:40 AM
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Re: MBC leaking
Yes, ball and spring units are better than bleeders, mainly because the ball/spring valve stays closed until the set boost pressure is hit. This make them tend to spike more, but a prper spring rate and other variables can limit it. Turbo XSs are known for spiking more than Halmans or Joe Ps. I like the Joe P personally.
The hole is supposd to be there, and it will leak during an intake pressure test. I usually block off the MBC when testing so it doesn't make it hard to find the real leaks.
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Kevin Jewer RWD Talon - 7.92 at 180 Mightymax - 10.7 at 125
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