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8psi
about 60psi
The f22b1 is a great engine for boost it has a compression of 8.8:1 and can handle 12.1:1 so you boost about 11-12lbs. On the stock internals no problem.
i hear with a propper tune with a stock turbo on a 2.5 sti the highest safe boost is 23 psi
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.
8lbs max, anymore and you better cross your fingers.
35 psi with stock turbo or 49 psi with stock head gasket.
EJ251
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.
Only about 7 or 8psi safely on a stock motor anymore than that your asking for another motor. Experienced this with 12psi was fun lol and I was impressed with how much it held up to.
The stock Twin cam 2.4 can handle this kind of boost, GM actually made a supercharger (i have it in a sunfire 2.4), when installed by a GM dealer, the car kept his warranty on the engine and it boost 5 psi, can be modified to run like 7-8psi maybe 9psi but you have to cool the supercharger with alcool injection kit and I'm not sure if the internal part of your stock engine will handle it
7 psi is safe to boost on a stock d-series motor