I have a 98 TT 6sp Supra with a Profec B spec II and a off road downpipe is all installed. What the problem is is that the boost is not holding now, we converted it from kPa to PSI and it will go from vacuum hit a peak and then just fall back down when I am accelerating. We are not sure how the peak, gain and all the other stuff works either. I have a BCC for the car too but have not installed it but the car now feels like it isnt pulling as hard stock. The car only has 40000 miles on it so we know its not turbos or other problems but just tunning. Please help !

You have to install the BCC to make some serious power. Does it feel like it "cuts" and jerks a bit when you floor it and it goes up to about 15 psi? After installing the BCC, you should be able to hold boost more easily.

-Olivier

I seriously wouldn't mess with it until the BCC is in. Just turn it off and make sure it pulls the same. After you get the BCC in shoot me a PM.

how did you convert the profec b to PSI? I just got my boost controller and at the exact same position as you are now.

Is it just the Profec B or the Profec B Spec II...... I hate companies sometimes. For some reason, the spec II can only show psi in x10 (10 psi = 100 display).

I rode in a BPU car with the spec II and it showed psi normaly!? I don't understand. You should mess with the settings a bit more.

-Olivier