Boost problem after fmic install? please help

[oldman]

Hey guys , I need some suggestions here. My car was running at 19psi with 16g.... I get full boost at between 3500 to 4000 rpm. I've just finished installing Buschur FMIC with 2.5" piping and now if I step on it at 3500 rpm, it hits 14psi and gradually reaches 16psi until 5200 rmp and suddenly jumps to 18psi and stays there. These are the things I have done with the install.

1. fmic with full 2.5" piping including TB elbow.
2. replace the vacumm hose from BOV to intake with 3/16 (smaller than stock, problem?) silicon hose. Tap the hose for boost controller since I no longer have the nipple on the turbo outlet pipe (j pipe).
3. Clean the TB (via VFAQprocedure) with new gasket and RTV.
4. slim fans
5. install none cruise throtle cable.

I know from reading that I'm suppose to lose some spooling time b/c of the fmic but 5200 rmp for a small 16g doesn't sound right at all, right? Besides this problem, car is running perfect, no idle problems at all. I've been on this project for about 3 weeks now (2hrs every nite) please help.

Thanks. Bruce

 

[oldman]

I just need some ideas....

I'v checked every connection for leaks and they seem to be nice and tight. The only other thing I can think of is the way my boost controller is set up. The old set up was actuator, turbo outlet and MBC running into a T. I now remove the line to turbo outlet and ran it to another T off the BOV line. Could this be my problem? Thanks.

 

[uh-oh]

what type of boost controller is it??

 

[oldman]

what type of boost controller is it??

It's of the old school type with the turning knob. It has two vales on both sides, one side runs to the T, the other side has an open cut hose. Some guy did the install of the MBC for me back in 1995. I was going to run the other valve to the new T on the BOV and just get rid of the old T, but not sure if I can do that with this MBC.

 

[uh-oh]

you should have one side of the MBC T'd into the intake to BOV hose and the other going str8 to the nipple on the wastegate with no tee...is that what u have??

 

[oldman]

Nope, but I'll try that.

 

[uh-oh]

it'll run hard...if you have a upgrade pump set boost to 18psi in 3rd gear...it'll spike to probably about 23psi initially which will give you a real kick then it'll settle...make sure your lower honeycomb is out or you will get boost cut

 

[oldman]

No, it didn't work. I don't think my MBC can be hooked up that way, it just shoot straight up to 24psi even with the MBC all the way down. I put it back the way it was and went for a drive. If the boost level is set lower than 15psi, I will reach full boost at 3500. If set above that, it will hit 15psi first than final setting at around 5200. I'm all out of ideas, how about some help from a wiseman...

BTW thanks uh-oh