Hey guys. My '93 is stock except for a downpipe which I just put on. At the same time I replaced all the vaccuum line with silicon lines (what a fun job!). I was very careful and I'm 95% sure no lines are kinked, pinched, or routed to the wrong place.

I also installed a boost gauge so I don't know if these problems existed before I put on the gauge or not. (Just bought the car a month ago)

Here is my erratic boost pattern:

If I slam on the car in 2nd starting from around 2500rpms the boost will jump to almost 15psi (too high right?) and then settle back down to around 11psi very quickly and stay about there.

If I slowly depress the accelerator to the floor from a dead stop the boost will initially go to about 10psi and then drop to 7psi for the rest of the rpm range.

Once in a while I get was appears to be a somewhat normal 13-11-13 boost pattern. But it's not predictable when this happens.

If I give the car 1/4 gas from a stop the turbo spools up almost instantly to about 5psi and then drops suddenly to zero psi.

What worries me most are the momentary ~15psi boost spikes that occure when I slam the accelerator in the mid to low rpm range. I'm never really supposed to run over 12psi right?

What boost pattern should be normal? 12-10-12 right? If mine is screwed up what do you think might be causing it? Bad Solenoids? Bad vaccuum line? Downpipe?

I did break the nipples on three of my solenoids so I replaced them with three used ones. All the solenoids are the same part right? They're interchangable?

Any help is VERY MUCH appreciated.

I just want to not have to worry about blowing up my car... is that too much to ask? Maybe I should stick to my Miata's...

Thanks guys!

-John Magnuson