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How To: Manual Boost Controller


bond1318

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  • 3 weeks later...

just installed the MBC...i also am cleaning my air filter, so while thats drying, can you confirm that this is correct before I start the car up...

MBC...

http://s40concepts.net/forum/index.php?t=getfile&id=15169

Loop on stock solenoid...

http://s40concepts.net/forum/index.php?t=getfile&id=15170

EDIT: I hope its right because I just did some test runs with it. Somehow I set it perfectly where I wanted it straight from the beginning. Boosting 15-17psi.

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  • 2 months later...

Lol every single one of you has different setup... than me I have the Y Connector and one port of my MBC is actually not even being used .. yet I still get the boost here I'll show some pictures

http://img357.imageshack.us/img357/194/goodws6.jpg

Y connector

http://img361.imageshack.us/img361/2092/dscf0010kt1.jpg

MBC one port is not used

http://img403.imageshack.us/img403/71/dscf0007xm4.jpg

One of the Y connectors going to.. what I think is the turbo, I'm not gonna act like I know what it is since I still don't know engines much

http://img403.imageshack.us/img403/865/dscf0008cr0.jpg

Another Y Connector going here

And the last connection is going to my Boost Gauge

I believe I have it right... don't quote me, cause when I put the pedal to the ground I get ~15 PSI... and that was AFTER i took the BCS out, although when I drive I can feel my car some-waht stuttering like it's almost trying to keep up, gonna turn it down a lil since I don't really have any engine mods Sad

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The first Y connector you have shown runs from the manifold to the compressor bypass valve and should be tapped with a T or Y fitting for a boost gauge. The reason you are able to boost 15psi is because the wastegate is pretensioned to 7.5psi, the max boost setting on a stock car, once this pressure is overcome the wastegate will fully open and give roughly twice the amount of boost as the pretension, which happens to be about 15psi.

Basically, your boost controller is inactive at this point and you're running no boost control, straight wastegate setting.

I suggest following the boost controller bypass post to get things right.

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Well... stupid me I found the yellow or red tube (Forgot which one) and put that on the MBC so now I have both yellow and red tubes connected so now the MBC is being used. I'm getting around 11 PSI with both of them connected.. and that's with my MBC almost all the way in..

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IncreasedX wrote on Sun, 11 May 2008 23:15

Well... stupid me I found the yellow or red tube (Forgot which one) and put that on the MBC so now I have both yellow and red tubes connected so now the MBC is being used. I'm getting around 11 PSI with both of them connected.. and that's with my MBC almost all the way in..

Doesn't sound right. Red should be the input into the MBC, directly across from the adjustment knob/screw, and yellow should be the output going directly to the wastegate actuator. Make sure you don't have them crossed. The t-fitting is not connected to the mbc in any way correct?

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  • 2 months later...
  • 5 months later...
  • 2 weeks later...

BrianT wrote on Sun, 02 March 2008 21:41

just installed the MBC...i also am cleaning my air filter, so while thats drying, can you confirm that this is correct before I start the car up...

MBC...

http://s40concepts.net/forum/index.php?t=getfile&id=15169

Loop on stock solenoid...

http://s40concepts.net/forum/index.php?t=getfile&id=15170

EDIT: I hope its right because I just did some test runs with it. Somehow I set it perfectly where I wanted it straight from the beginning. Boosting 15-17psi.

My question.......

So whats the difference between setting it up like BrianT, and doing the setup like how it was shown in the very first post in this thread? Which one is more efficient and gives more power, if it does.

I am really clueless, I just found a old MBC I bought 3 years ago and want to install it already.

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Not more power, quicker spool time, and the ability to hold boost steadier. Set it up like Brian and I, bypass the solenoid and run the red line from the compressor to the MBC inlet, and the MBC outlet to the wastegate (yellow line). Everything else can be capped or looped.

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