installed mbc, still only 5psi

[ilikebigbutts]

i just installed my voodoo mbc and i'm still getting only 5 psi.What could cause this?

i turned it all the way counter clock wise (like ALL the way) and i was barely getting 5. now 15 full turns later and i'm still getting only 5 psi, although i did see 7 psi for a split second in 3rd gear.I've only been able to wind 2nd gear up to redline and i just wont get above 5.

The only thing i can think of:

Boost leak
weak wastegate?i have an extar one i should switch them
shitty boost gauge...

To be honest the car does feel a lil more powerfull but not that much it could just be in my head to.Any thoughts?the thing is like threaded half way in i figured i'd have more boost by now...

 

[Supraboy89]

do you have the lines in the right ports on the mbc

 

[ilikebigbutts]

yes i have them just like the voodoo diagram shows

 

[89turbotoy]

maybe a big boost leak can you really hear the turbo? i mean it would be REALLY loud. if it is check the rubber pipe off the turbo outlet they are known to get brittle over time and break.

 

[ilikebigbutts]

i just double checked the lines and they are hooked up right and no i can not hear any boost leaks at all...

 

[Supraboy89]

check to see if there is a difference when you take the lines off of the turbo and blow through them. if you can blow through it there is something wrong with it. the mbc that is

 

[2543arvin]

i just installed my voodoo mbc and i'm still getting only 5 psi.What could cause this?

i turned it all the way counter clock wise (like ALL the way) and i was barely getting 5. now 15 full turns later and i'm still getting only 5 psi, although i did see 7 psi for a split second in 3rd gear.I've only been able to wind 2nd gear up to redline and i just wont get above 5.

The only thing i can think of:

Boost leak
weak wastegate?i have an extar one i should switch them
shitty boost gauge...

To be honest the car does feel a lil more powerfull but not that much it could just be in my head to.Any thoughts?the thing is like threaded half way in i figured i'd have more boost by now...

If you were to turn up the boost, then you would feel a big difference.

I just turned mine up from 7 to 14psi and you would DEFINITELY feel a difference, trust me.

 

[89turbotoy]

do you have any other mods?

 

[ilikebigbutts]

i will check that tommorow thanks for the advise guys

 

[ilikebigbutts]

the only mods i have are intake kit and 3" elbow back with a huge exhaust leak after the cat lol

 

[89turbotoy]

any smoke under boost?

 

[ilikebigbutts]

no smoke at all

 

[89turbotoy]

ok check out your boost controller like supraboy said and post what you find

 

[ilikebigbutts]

thank you guys i will get to it tomorow mornig the car is way to hot now lol.

i forgot to mention, the manual said turn it all the way counter clock wise, well i did and i wasnt paying attention and the whole stud came out.i could see the lil ball in there moving up and down as i fliped the mbc repeatedly.just tjhrowing it out incase i fucked anything up?

 

[americanjebus]

what are you using for a bypass valve??

Stock bypass or actual blow off valve.

If its still got the stocker on it listen for a fluttering sound when you let off.

 

[GrimJack]

This could be several things. Are you using the stock boost gauge, or do you have an aftermarket one? The stock one isn't reliable enough to use.

As was mentioned, check for boost leaks. You are better off building the $5 boost leak tester and using that. FYI, I've seen quite a few boost leaks that were so big they didn't hiss.

The average joe (non smoker) should be able to blow about 7psi, so check if you can blow through the MBC. If you can, and it doesn't get harder to blow when you turn it, it's FUBAR.

Finally, you could have a tired wastegate spring from 15+ years of service in the hot area of the engine bay. That's pretty easy to check too, try adding a couple shims to the wastegate and try it again, if your boost goes up with the shims, you've pinpointed the problem.

 

[ilikebigbutts]

o yeah forgot to mention the car came with a cheap aftermarket boost gauge, i dont know how acurate it is though.also i do have a blowoff valve not the stocker.my guess is shitty mbc and i'll try to make a leak tester on friday if i have time

 

[GC89]

Interested to hear what you find I have the same problem. I checked for boost leaks with a homemade tester. I cant blow through my stock bpv. No smoke and turbo spins freely with minimal shaft play. Home made MBC will put me up to five with pressure to the actuator completly closed off. I do hear flutter when I shift though?? Good luck hopefully someone will have something that can help us both

 

[ilikebigbutts]

i'm going to check the mbc tommorow, then swap out wg's.

 

[supranasty]

Check the in and out hoses and try reversing them they may be backwards.:1zhelp: