While it's very changeable via tuning and physical modifications, I believe the stock WRX is 7-8 psi, and the stock STi is 14 psi. To get really into it, an Eaton M62 supercharger installed with stock pulleys is usually between 2-5 psi, and an Eaton M90 installed with stock pulleys will net 7-9 psi (just incase you're cool enough to try going the route of supercharging)
17psi
12 psi in both ranges
Boost is positive pressure in the manifold, so you only see boost when you give the gas pedal heavy load. The best way to check the boost pressure is to connect a vacuum hose to a boost gauge. This will tell you the exact boost pressure when you are in wide open throttle.
boost pressure, as you call it, will not show on gauge,if you have one, while engine is at idle the turbo pressure does not boost but runs all the time according to the revs of engine
Boost pressure is the amount of pressure above normal atmospheric pressure the turbo/supercharger is producing. Can be expressed in PSI (US used) or BAR (mainly outside the US). BAR = (boost pressure) * 14.7 (atmospheric pressure) / 14.7 (atmospheric pressure), an example 8psi of boost equals: 14.7+8/14.7 = 1.54bar
A boost gauge in an internal combustion engine has the role of a pressure gauge. The gauge indicates the manifold's air pressure or a turbocharger or supercharger's boost pressure.
boost is pressure. units of pressure is pounds per square inch(psi), atmospheres (bar), and kilo pascals (kpa)
If you intend to raise boost to about 1.2 bar (generally recognised as the maximum safe boost) you will need a fuel cut defender.
What is manfacture tire pressure for a1998 forrester
It is when the boost pressure is higher than what the wastegate is set at. Porsche's are know for this, they allow a pressure spike while shifting which a boost in torque output.
The map sensor and boost pressure sensor are the same thing.
Boost pressure at full throttle under load should be about 37lbs.