Problem with MBC

[dj JINX]

I have a joep mbc and was booting about 14psi daily for a month, I took of the mbc to clean up the install and turn the boost down to compensate for the cooler weather coming, But now I cant get it to boost past 8psi, No matter how far i screw the knob out:wtf:

 

[MazdaspeedZOOM]

I have a joep mbc and was booting about 14psi daily for a month, I took of the mbc to clean up the install and turn the boost down to compensate for the cooler weather coming, But now I cant get it to boost past 8psi, No matter how far i screw the knob out:wtf:

I would check the connections again, you may either have a leak somwhere or a crimp in one of the hoses that you used. I know when I first installed mine it wouldn't go any higher or lower than 16psi and no matter how much i let it out or turned it in. Turns out I had a crimp in some of the hoses. I would say check the install again and just make sure all is correct.

 

[unwrittenLaw]

I have this same problem..mine won't go past stock boost levels (6-7psi at load). I thought maybe the dealer had done something to the wastegate last time I took it in for a CEL, but all the vacum lines look ok and the boost holds steady so I don't think there's a leak...I dunno. I'm gonna take out the mbc and check it...but I don't really know how to tell if the mbc is defective...

 

[Fakhelek]

I have a joep mbc and was booting about 14psi daily for a month, I took of the mbc to clean up the install and turn the boost down to compensate for the cooler weather coming, But now I cant get it to boost past 8psi, No matter how far i screw the knob out:wtf:

Don't you screw the knob in to raise boost?

 

[jonnydoe48]

he wants to lower the boost..

anyway, soundbombing has this same problem. he wont go lower than 8 psi either.

 

[EvilMSP]

Wait....the Garrett Turbo is capable of producing 14 psi?!?!

 

[girth]

Wait....the Garrett Turbo is capable of producing 14 psi?!?!

Sure. It's probably not that efficient at that level though. JoeP boosted to at least 18PSI - maybe more.

 

[soundbombing]

yes it sucks! i've changed all the vacuum hoses and it still does the same thing for. i took out my cai and i still hit the cut since it peaks past 10 psi and holds from there but it sucks. i drive @ night a lot and the cut makes me so mad but the boost is nice. i guess i have some pretty dense ass air since some ppl don't even hit cut @ 14 psi. they can go to HELL!!! j/p

i'm either
a. joe p fcd
b. perfworks (if he is still involved) upgraded maf
c. full engine management and screw all the bull s*** and burn the maf in the garbage.

those also go in order of cost effectiveness and power gains

it's late so i'm outtie.

peace.

 

[unwrittenLaw]

Did you check the wastegate, make sure everything was ok down there?

 

[14LBS]

the garret t-25 is capable of 22 lbs accordin to turbonetics

 

[Stormtrooper77]

From what I've been reading, isn't it not recommended to boost beyond 9-10?