MBC question here.

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MBC question here.

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MBC question here. - 2/16/2008 6:19:03 PM

smarsenal

Posts: 15
Joined: 2/16/2008
Status: offline

I just installed the Buschur inline MBC.(connected between intake mainfold/BOV and Wastegate)(set it with 3rd gear pulls). I cranked it up, but initially boost plateaus at 14 PSI, then it slowly peaks to 21 psi and is held there. My question is: Is it normal for this first plateau at 14 psi to happen or do I have a leak or something (could it be hooked up wrong?) Thanks in advance!!

BTW, the supporting mods are : (BR350 plus some extra fun stuff)

BR 2.5" Mandrel Bent Stainless Steel Downpipe
BR 3" Mandrel Bent Stainless Steel Catback Exhaust
BR Air Filter Kit
Oil Pan Heat Shield
BR Polished Exhaust Manifold Heatshield
BR Spark Plug Cover
BR 2.5" Upper Intercooler Pipe w/ stock BOV
BR Mini Battery Kit
Ported Exhaust Manifold
Ported Turbine Housing
Ported 02 Housing
3" testpipe
autometer 30-0-30 boost guage

< Message edited by smarsenal -- 2/16/2008 6:27:19 PM >

Post #: 1

RE: MBC question here. - 2/16/2008 6:42:14 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

Boost creep it sounds like

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These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

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Post #: 2

RE: MBC question here. - 2/16/2008 6:46:57 PM

EMonz57

Posts: 11559
Joined: 5/13/2005
Status: offline

He shouldnt be creeping with those mods. at what RPM does it hit 14PSI. and where RPM wise is it at 21?

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1993 Supra 6spd(OOOO\ ..... /OOOO)

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Post #: 3

RE: MBC question here. - 2/16/2008 6:58:25 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

Okay, go to youtube, search for boost creep and see if that is what you are experiancing.

Maybe the wastegate isnt opening all the way

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These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to EMonz57)

Post #: 4

RE: MBC question here. - 2/17/2008 5:02:03 AM

TheEngineer

Posts: 10592
Joined: 1/25/2006
Status: offline

i agree with mike. There is no way you should have boost creep with just those mods. One of the first things i would try is to not tap off the BOV line but go off of the FPR line and see if that helps. Also make sure the MBC is not hooked up backwards.

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quote:

ORIGINAL: pilsenblue
Even tho My car looks great It will never be fast. Kinda like a hot girl that dosent give it up

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Post #: 5

RE: MBC question here. - 2/17/2008 5:30:33 AM

smarsenal

Posts: 15
Joined: 2/16/2008
Status: offline

At around 3500-4000 rpm I'm at 14 psi,then it will start to creep up and reach peak boost at redline.

(in reply to EMonz57)

Post #: 6

RE: MBC question here. - 2/17/2008 2:44:45 PM

TheEngineer

Posts: 10592
Joined: 1/25/2006
Status: offline

what doesnt make sense is that stock boost is set for more than 14psi. So im guessing you have either a vacuum leak or that MBC is not hooked up correctly or set correctly

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quote:

ORIGINAL: pilsenblue
Even tho My car looks great It will never be fast. Kinda like a hot girl that dosent give it up

(in reply to smarsenal)

Post #: 7

RE: MBC question here. - 2/17/2008 5:28:22 PM

smarsenal

Posts: 15
Joined: 2/16/2008
Status: offline

Well, I changed directions that the MBC was hooked up and got the same result. I'm going to do a thorough boost leak test now. Thanks for the input.

(in reply to TheEngineer)

Post #: 8

RE: MBC question here. - 2/18/2008 5:48:44 PM

smarsenal

Posts: 15
Joined: 2/16/2008
Status: offline

OK I was just being a panzy. Apparently, I didn't have it turned up enough. I just cranked it up and it works great. Another great product from Buschur!!! It holds right where I want it at 21 psi!!! Thanks for the help!!

(in reply to smarsenal)

Post #: 9

RE: MBC question here. - 2/19/2008 5:19:03 AM

TheEngineer

Posts: 10592
Joined: 1/25/2006
Status: offline

im surprised the stock BOV is actually holding that too. Because that thing will leak like a bastard. I think that would be the next thing to upgrade. Assuming this is the evo VIII with the plastic one

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