As much as the waste gate is set at, size of the turbo, size and a/r of the turbine housing.
"How much you can run" depends on...
the strength of the engine(forged internals?)
compression ratio
if iron or alum. head
head gasket material/ head bolts or studs
Intercooled/alcohol injected
the octance fuel you are running
If it is a normally aspirated 3.8L, 7-8psi is the general safe boost level for stock engine.
If it hasn't got a turbo there's no place for it to get boost from.
The stock boost of a 1987 Toyota Supra Turbo is 6.8 psi/0.46884349504 bar.
you might be running too much boost off of your turbo especially if youre running a stock turbo
Stock turbo can run close to 14 PSI...but you can increase as much as your turbo can. The engine will not last as long with higher boost. Upgrading internals such as pistons, rods, crankshaft, camshaft, and valves can allow much higher boost.
Depends on the turbo itself and how many pounds of boost its set at.
You can get quite a bit of boost with the BD-Power twin turbo kit, but it depends on your engine and how you mate the kit.
Anywhere from 1-10k depending on the hp boost
Pushing to much boost maybe?
This means the the turbo is generating too much boost and is tripping out the engine management.
7 psi is safe to boost on a stock d-series motor
My turbo does not boost
Turbo for your phone