drftem

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?

Braineack

iTrader: (62)

let me draw a diagram...sit tight.

Braineack

iTrader: (62)

its a bleed type MBC....the small sqaure is just a tee...and the large valve is just a needle valve...

drftem

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.

350drft

Whats the grey portion of the diagram represent?

neogenesis2004

iTrader: (12)

the port on the intake manifold, throttle body to be more precise.

cjernigan

iTrader: (13)

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.

neogenesis2004

iTrader: (12)

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.

lazzer408

iTrader: (1)

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.

lazzer408

iTrader: (1)

Brain loves ms paint ?

neogenesis2004

iTrader: (12)

too much anti aliasing for it to be paint.

cjernigan

iTrader: (13)

Yeah thats a little weird compared to what I'm used to.
Long as it works though.

Braineack

iTrader: (62)

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.

Slidin'Miata916

iTrader: (-1)

the other end of the contorller its self (orange) can be left open like that with no vacum on it?

Braineack

iTrader: (62)

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.

Slidin'Miata916

iTrader: (-1)

Um....Sorry If im dumb. But, so your saying with the one way check valve you can leave the other end open?

Braineack

iTrader: (62)

boost can leave, vacuum won't get pulled in.

Slidin'Miata916

iTrader: (-1)

Braineack, So is that a yes? You can leave it open? I dont understand the "boost can leave" part. Sorry for being difficult.
Thanks

Braineack

iTrader: (62)

yeah, there's nothing wrong with it...it's how the BEGi FMU works as well.

Slidin'Miata916

iTrader: (-1)

Ok cool thanks. Thanks for not being harsh : / lol