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Old 06-01-2007, 10:04 PM   #1
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Default manual boost controller question????

ok i bought this manual boost controller from ebay
http://cgi.ebay.com/ebaymotors/ws/eB...m=280119453721
i cant figure out how to install it. so i installed the t into the line from turbo to actuator. the off the third nipple i have a line running to the controller unit. as i open it it raises the boost but there is an open nipple. it just doesnt seem correct. please help me out. also as i take the control unit and try to blow threw one end i can easily blow threw it with it set at max boost when the boost is set at lowest boost i cant blow threw it at all.
my boost is turned up to 8-9 but only peaks there then drops to like 7 would that be normal ore is it maybe the boost controller?
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Old 06-01-2007, 10:16 PM   #2
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let me draw a diagram...sit tight.
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Old 06-01-2007, 10:25 PM   #3
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its a bleed type MBC....the small sqaure is just a tee...and the large valve is just a needle valve...
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Old 06-02-2007, 12:51 AM   #4
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ummm well thats what i was thinking but she is running 9 lbs of boost and noot so jumpy now that i put it inline. i dont know. its only gotta last for a bit im gunna get an electronic 2 stage boost controller soon.
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Old 06-02-2007, 01:54 AM   #5
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Whats the grey portion of the diagram represent?
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Old 06-02-2007, 02:06 AM   #6
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the port on the intake manifold, throttle body to be more precise.
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Old 06-02-2007, 02:24 AM   #7
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Actually the grey part is the MBC bleeding off pressure, so Grey=Air Flow.
The boost source is coming from the compressor itself instead of the intake or throttlebody.
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Old 06-02-2007, 02:39 AM   #8
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wtf, that setup is too complicated.... If it were me I would just stick the mbc between the boost source and the actuator.

I stand corrected.
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Old 06-02-2007, 02:40 AM   #9
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Quote:
Originally Posted by Braineack View Post
its a bleed type MBC....the small sqaure is just a tee...and the large valve is just a needle valve...
I think the T has the restrictor pill in it as well. The feed from the turbo outlet can supply more cfm then you can vent which is why a restrictor is used. For example. 1/16" pill with 1/16" bleed drops pressure to the wastegate 50% (about) and it takes 20lbs of boost at the pill to make 10 at the wastegate if your bleading off 50%. I hope I made that make sence. If you know electronics it works like a resistor divider.
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Old 06-02-2007, 02:42 AM   #10
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Brain loves ms paint ?
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Old 06-02-2007, 02:49 AM   #11
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too much anti aliasing for it to be paint.
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Old 06-02-2007, 02:50 AM   #12
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Yeah thats a little weird compared to what I'm used to.
Long as it works though.
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Old 06-02-2007, 12:37 PM   #13
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that was adobe illustrator....(using laptop with no mouse :( )

its a basic bleed type MBC....the tee restricts the airflow and probably is a one was check valve on the blue port (that way it doesn't cause vacuum leak at idle) then when boost enters the wastegate so of the air gets bleed out of the line before it reaches the wastegate so the boost goes higher.

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Old 06-04-2007, 08:43 PM   #14
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the other end of the contorller its self (orange) can be left open like that with no vacum on it?
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Old 06-04-2007, 09:37 PM   #15
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hence the check valve. losing the slightest bit of vacuum in that location under boost will do nothing to your A/F mixture. The check valve prevents it from leaking at idle.
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Old 06-04-2007, 09:53 PM   #16
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Um....Sorry If im dumb. But, so your saying with the one way check valve you can leave the other end open?
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Old 06-04-2007, 10:05 PM   #17
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boost can leave, vacuum won't get pulled in.
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Old 06-04-2007, 10:53 PM   #18
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Braineack, So is that a yes? You can leave it open? I dont understand the "boost can leave" part. Sorry for being difficult.
Thanks
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Old 06-04-2007, 11:28 PM   #19
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yeah, there's nothing wrong with it...it's how the BEGi FMU works as well.
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Old 06-04-2007, 11:30 PM   #20
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Ok cool thanks. Thanks for not being harsh : / lol
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