over boosting but MBC is turned all the way counterclockwise

[chronicvex]

Any ideas what this could be? Possible MBC is just in backwards? I have it installed correctly, assuming taping into jpipe is the correct way. Any help is appreciated, thanks.

 

[2GFWDbeast]

Could have a bad spring in the mbc or a leak somewhere

 

[GRAVEDIGGER]

Usually out is as low as it will go. As you go in it usually increases boost pressure. Do you have a picture of how you have it hooked up?

 

[chronicvex]

no but i will take one in a little bit and post. I posted this thread to see which valve was in and which was out. If its hooked up backwards could this be the result? http://www.dsmtuners.com/forums/newbie-forum/383940-newb-mbc-question.html

I'm hopeing I dont need a new mbc. Although I could just follow the vfaq on how to build one for cheap .

 

[1GRedRocket]

i had a similar problem, what MBC did you buy?

 

[chronicvex]

I dont know what kind it is. Was on the car when I bought it. Thats why I had to post the thread to see which valve was which

 

[doubleclutch99]

Take the mbc out of the equation and run the j pipe nipple to the wastegate. just to make sure that the wastegate is functioning properly . then add the boost controller back in and work from there.

 

[GsXdSmKingGsX]

Exactly how much boost is it showing?

 

[razrman8]

Like GRAVEDIGGER said, I would try and get a picture of how you have it hooked up. How long have you been running the MBC? Did it just start doing it?
If I read correctly, you just hooked it up. So it probably does indeed have to do with a)a faultly MBC or b) improper installation.

 

[chronicvex]

Well, I get off it once I see it going past 17 PSI

First time in a while I'v driven it, because the throttle pedal is also sticking . Yea I'll go take a picture as soon as gf frees me from phone.

I'll try that doubleclutch99, thanks. How much is it supposed to boost without mbc?

 

[GRAVEDIGGER]

no but i will take one in a little bit and post. I posted this thread to see which valve was in and which was out. If its hooked up backwards could this be the result? http://www.dsmtuners.com/forums/newbie-forum/383940-newb-mbc-question.html

I'm hopeing I dont need a new mbc. Although I could just follow the vfaq on how to build one for cheap .

That's a strange looking boost controller to me. I wouldn't know which way to hook that up either. Has it ever worked correctly? I mean your other thread was started in November.... Has it ever worked correctly? If it has never worked right I would switch it around and see what happens.

 

[razrman8]

Switch it around, try different adjustments. Thats about all you can do untill you figure it out. I have never seen on like that either Careful on the throttle thought while testing all this

 

[chronicvex]

haha, yea ill try switching it around first. Ok, i'm free... ill be back in abit with results

 

[idkiliketurbos]

I had this same problem and ended up having a boost leak at the j pipe flange and it fixed the problem.

 

[GRAVEDIGGER]

Take the mbc out of the equation and run the j pipe nipple to the wastegate. just to make sure that the wastegate is functioning properly . then add the boost controller back in and work from there.

This would be a good idea.

 

[okcpopeman]

Are you sure its not boost creep? What turbo are you running and how big is your downpipe? For example with my car, I am currently running a 14b and a 3 1/2" downpipe from my old build ( I know its too big ) i have my MBC set to ~10psi but it will creep to 20psi+ cause the WG cannot flow enough to keep up with the big exhaust.

 

[1GRedRocket]

for me, i bought a turbonetics MBC (Turbonetics Variable Boost Kit - Modern Automotive Performance). this was before i knew much about dsm's or was a part of this forum. it did the exact same thing, even all the way counterclockwise it wouldn't limit boost, luckily i didn't blow my motor . after trying every possible configuration i gave up and got a hallman pro and no problems since!

 

[chronicvex]

16g with 3" downpipe i hope its not boost creep

 

[TunaTalon]

17 PSI is the waste gate pressure on my E3 16G. That's as low as it will go.

 

[RBehne2]

Most mbc's hookup with side to wastegate, bottom to pressure source (turbo, intake mani, etc.) If you still need help, I live 1 min from Annapolis mall, you can pm me your info after the Green Bay game

 

[crusada]

I agree that is a strange looking controller i had a friend of mine that had this same issue and it ended up being a leak at the jpipe as well

 

[chronicvex]

The problem to this was actually the 1g BOV that was crushed too much. When I put on greddy type s it worked perfectly. Better late then never? Now I'm having a similar issue with my new DSM. I just installed a freshly rebuilt e316g, evo 8 injectors, and fuel pump. It wasnt happening with my T-25 at all. I suspect boost creep because even without MBC its trying to go over 20PSI. Having turbine housing ported and we'll see what happens.