I was wondering what the stock boost guage will show on a stock 95 850t5? How far into the white bar should it get? Also I think that my car is not boosting as high as it should, as in at full throttle from a start it will go to the straight up position and then slowly work it's way up to only about 1/4 the way into the white bar. Even when it spikes at the shift it will get to just under 1/2 in the white and fall back down to the 1/4 mark until the next shift. What could I do to fix that? Is it bad vacuum lines, or is it clogged somewhere? (I just put a new air filter in it and that helped marginally.) It seemed to have just happened although maybe it was always boosting low and since it was only 20 to 30 degrees I didn't notice it until it warmed up to 60 - 70 in about a 3 day period (Minnesota weather, snow one day, two days later 70 degrees)

Any help would be greatly appreciated.
Anthony Randall
1995 stock 850t5

if i remembered correctly...the stock boost gauges never really told me anything. it was kinda like either on, neutral, or vacuum. get a real "numbered" boost gauge if u're absolutely concerned and want some numbers. it should be 9.6 psi for u.s. version.

Further to my reply, I found there was probably nothing wrong with my turbocharger - my problem was caused by a blocked catalytic convertor.

Keith

My problem seemed to have been from a Bad quality generic gas station. They have 93.5 octane cheap, but then I started going to Amoco and reset my computer and it started sustaining half to two thirds it even spiked to the end on a cold day. However substantially better as on warm days it still only sustains one third to half, but I might just check the Cat on mine and see. I have had a clogged cat on two of my previous cars ('91 taurus and a '96 GrandAm). If it is clogged it might be an oppourtunity to by a whole new exauhst, including a race cat :) Thanks for the update.

Anthony Randall
1995 854t5

Anthony, Guys

I have a similar but even worser problem, in fact most of the 850's here in Thailand have it, and garages seem unable to fix the problem no matter how much you complain. (Mine has had the car for weeks already for a warranty repair on this and the A/C)

I believe the likely cause is a hose leak on the manifold side of the turbocharger. Another possible cause might be the wastegate adjustment on the turbocharger.

I would also like someone to reply re the boost guage - The halfway point (12 o'clock) position refers to no boost or vacuum - 0 bar/psi. and that full scale is 1 bar or 14.7 psi

From scanning threads on this and other boards, I believe stock boost is supposed to be 0.67 bar or approx 10 psi. This would imply the highest boost to be about 2/3 into the white area.

Can anyone confirm these figures?