2g boost problem, wont go higher!!!!! Options

[treydawgs4g63T]

I have been trying for a couple of days now to try and turn my boost up to around 13psi. I have two MBC's and neither of them seem to let it go any higher than 10 psi. I was running 8 psi with the stock boost contoller and ever since i installed the MBC's it only goes to 10. I dont know if there is something Im not doing right or what. The vac lines are as follows:

wastegate
> teed into one and to one side of the BC
lower intercooler pipe

BOV
> teed into one to the other side of the BC
Intake manifold

this is how it was when it was hooked to the stock BC, so either Im retarded and didnt do it right or their is a different problem.

THe boost controllers are SBRacing and Agency Powers. Not anything homemade.

Please help I wanna turn my boost up a little more.

thanks in advance
travis

[JBone]

A few things come to mind:
1.) Did you try to install them in reverse of what you were doing? Just to make sure you hadn't scewed up the way you install the mbc's
2.) You might already have a boost leak somewhere. Stock BCS should be around 10. You should perform a leak test to make sure.
3.) To verify your boosting with no problems from them, hook a straight line from the compressor outlet to the wg and see what's up. If you are still around 10, you definately have a leak, or your wg is crap. the spring resistance in the wastegate is 14psi

Try also to check out vfaq.com
Click on Turbo and then on custom mbc install. the second pic shows routing of the mbc.

The way you wrote your setup confused me a little, so check that out.

[akamiami]

Using the SBR boost controller, the vacuum line directly on the polar opposite end of the controller should be connected to a boost source, preferably the same line that goes to the BOV. The other one, that comes from the controller at a 90 degree angle should be connected to the wastegate actuator.

[90GSX]

akamiami's diagram is the correct way to install it. Of course the end thats cut off on there goes to the intake manifold.

wastegate
> teed into one and to one side of the BC
lower intercooler pipe

Not sure on a 2g, but on the 1g's the lower intercooler pipe nipple should be capped off.

Im assuming you have an aftermarket boost gauge? Are you sure its good? Just something else to check.

[treydawgs4g63T]

I havent capped off the lower intercooler pipe so maybe thats what doing it. I do have an autometer boost gauge and Im sure it works.

[treydawgs4g63T]

I will also do a boost leak test pretty soon also.

[The Iron Goat]

Also, do you have the 1g CBV or that crap 2g unit. If you have the 2g, I'd say that's your problem.

[treydawgs4g63T]

I have a correctly cruched 1g bov

[ncgalant]

Another thing to try. Unhook the boost control completely. Even at part throttle you should have no problem making 15psi. If you can't even with the boost source unhooked then your WG may not be closing all of the way or your actuator may be bad.

[treydawgs4g63T]

will do this afternoon

[99Spyder]

If you just pulled the stock boost controller and hooked the manual controller in its place I'm pretty sure that won't work. The stock electronic controller sits on one side of the T and releases the vacuum pressure from the line, like a BOV does for the intake system.

When you setup the manual controller the vacuum "signal" needs to pass through the MBC on its way to the WG actuator.

[treydawgs4g63T]

figured it out. Just had to plug the lower intercooler pipe off and go straight from the waste gate. They were t'd off. Stupid and easy fix.

[natedogg]

Not sure on a 2g, but on the 1g's the lower intercooler pipe nipple should be capped off.

Just had to plug the lower intercooler pipe off and go straight from the waste gate.

You figured it out!? Hmmm.

[mitsu90]