MBC question

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Postby alanip » Mon May 14, 2007 12:01 pm

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Postby Gary » Mon May 14, 2007 12:24 pm

From the instruction manual, this looks like 2-stage boost controller.
The ball&spring piece (T-piece) set the initial boost and the in-cabin bleed valve increases boost level.
If this is so, the exhaust hose doesn't have to connect to anything.

Try tighten the bleeder piece and see if your boost still creeps up.
If it still creeps up, you are having a problem with the ball & spring piece.
The spring is either too stiff or the ball get stuck and doesn't let any air passes through.
Using air compressor, try applying air pressure to that input port.
It should start opening and lets air through at 7 psi or whatever initial setting of that boost controller.
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Postby Gary » Mon May 14, 2007 12:26 pm

Another solution, throw that POS away and get a basic $10 ball & spring MBC.
People have been using that for years without any problem (except few spikes now and then)
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Postby GT4RC » Mon May 14, 2007 4:19 pm

Gary wrote:Another solution, throw that POS away and get a basic $10 ball & spring MBC.
People have been using that for years without any problem (except few spikes now and then)

yeah, i built 2 of them and it cost me a total of 22 bucks. most of the places i got my parts from gave me what i needed for free.
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Postby alanip » Tue May 15, 2007 2:51 pm

thanks a lot
i found what happen tomorrow :D
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Postby alanip » Thu May 17, 2007 10:54 am

Gary wrote:Another solution, throw that POS away and get a basic $10 ball & spring MBC.
People have been using that for years without any problem (except few spikes now and then)


where can i get a $10 MBC ?
do you mean a DIY MBC ?
but i am in australia
cheers
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Postby Gary » Thu May 17, 2007 11:16 am

Every ball & spring MBC has the same basic construction, (a steel ball, spring and the housing)
Some of them are more fancy or have better quality material (ceramic ball, anodized housing, etc..)
You can get one from ebay very cheap.
If it doesn't work like you'd like, you can fine tune it by replacing ball or spring inside.
Or you can try making the whole thing by yourself. I did.
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Re: MBC question

Postby MrMcQuacker » Fri Jul 12, 2013 5:49 pm

I apologize in advance for bringing the dead back to life :). But I have the exact same boost controller. I have it on and I have messed with the hoses and I just keep on going, boosting to the moon. I have it closed all the way so it should not boost no more than 10psi. Once I jumped past that I left off. I looked at the manual someone posted and it doesn't lead me anywhere. Whoever has done it with this type of controller can you please explain or post a picture of it installed?

Thank you
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Re: MBC question

Postby jaydog82 » Sat Jul 13, 2013 2:02 am

What is the car info? I have a MBC on my st165 working great. I can help you install it correctly if you'd like.
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mine is the red one on the left

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Re: MBC question

Postby MrMcQuacker » Sat Jul 13, 2013 3:31 am

Perfect I got a st165 with a 205 :)
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Re: MBC question

Postby jaydog82 » Sat Jul 13, 2013 4:37 am

Post some pics of you setup and I'll look at mine in the morning
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mine is the red one on the left

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Re: MBC question

Postby MrMcQuacker » Sat Jul 13, 2013 5:26 am

Thank you again so much. So you are running the boost controller that is posted here with that "T" piece?
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Re: MBC question

Postby jaydog82 » Sat Jul 13, 2013 11:23 am

No I'm using one by boostvalve
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