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Old 09-02-2007, 05:52 AM   #1
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Default Anyone make up a DIY dual stage MBC?

?
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Old 09-02-2007, 11:33 AM   #2
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maybe if you put more words before the "?" we could know what you were asking. double stage for what purpose? hi-lo?
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Old 09-02-2007, 01:56 PM   #3
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What possible use would you have for a dual-stage MBC?
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Old 09-02-2007, 04:59 PM   #4
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I am in the market for a MBC. With a four month old in the house, price is definitely an issue. So building my own or buying an ebay one (which from what I understand is pretty much the same thing) is going to be the way to go.

In my research on this board I came across this post:

from member Weitau:
Quote:
If you really want to splurge, go for a 2 stage MBC. 1 stage MBC just bleed air that should have helped the turbo spool up and avoids turbo boost spikes. On a 2 stage MBC, the first stage is controlled by a stiff ball/spring. This will get you into your target boost ball park. Then the 2nd stage lets you fine tune the boost by 1/2 psi.

I've been using one for two years, and never had a boost spike that could have killed my motor. Bought it from a guy on eBay, who still answers my support email today. ebay listing #300127883674
https://www.miataturbo.net/forums/sh...ad.php?t=10282

the part he is referring to:
http://cgi.ebay.com/ebaymotors/ws/eB...m=300127883674
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Old 09-02-2007, 07:50 PM   #5
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Should move this thread, it looks like a regular MBC with the addition of an adjustable bleed instead of the usual fixed bleed, not a bad idea.
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Old 09-02-2007, 11:56 PM   #6
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there are write-ups all over the place....basically a solenoid with an on/off switch, to route boost straight to the wastegate or through a ball/spring.
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Old 09-03-2007, 12:37 AM   #7
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Quote:
there are write-ups all over the place....basically a solenoid with an on/off switch, to route boost straight to the wastegate or through a ball/spring.
What solenoid?
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Old 09-03-2007, 12:39 AM   #8
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