most engines without any mods will hold up to 5 lbs of boost...anymore and you need to adjust the fuel
7 psi is safe to boost on a stock d-series motor
about 60psi
8psi
Stock is around 9psi.
A Chevy 305 produces:130 HP - 250 HP A stock 86 305ci Regal will be the 165 HP or 190 HP version.
3.8 inch pulley at 7-8psi
6-8
The stock boost of a 1987 Toyota Supra Turbo is 6.8 psi/0.46884349504 bar.
You can put a supercharger on a stock engine it depends on how much boost you run wether your engine can handle it or not.
6-8 on stock 3.8 pulley. max is about 15-17.
With the stock turbo it can only do 15psi of boost. Any more and its just shooting heat into your engine. Aftermarket I would't go anywhere above 40lbs/min.
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.