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> and the newer ecu causes my car to boost higher... it will be worthless because the bypass valve will open and leak some of my boost out correct?
At a certain point, yes. It's not a binary 'yes/no' issue, but more of a gradual problem.
> well, do you happen to have any idea at what psi that bypass valve opens at? like 15? 20?
Once you start to push over 15psi then it slowly becomes an issue and may become worthwhile to change the factory setup to a blow off. Instead of welding the valve shut you could also disconnect the actuator and use some bolts and shims to keep the valve closed by force.
Still would be best to find a blow-off valve which has an exit that can be connected to a hose, so the air that's released can be fed back into the turbo inlet (behind the MAF sensor).
You may get away with a 'free to air' blowoff. Some cars don't seem to be affected too much by the air loss, but others have problems with the car stalling out after releasing the throttle.
But... By that time you probably need to have the compressor trim on the turbo changed to provide the correct boost level, because the original one will start to run outside it's operating parameters and the air temperature starts to skyrocket.
> also what psi does a stock 850 turbo run at? i heard like 8 or 10psi.
Around that figure yes. It depends a bit on the age of the car and the type. The 'R' types run a little more boost.
Bye, Arno.
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