Quote:
Originally Posted by army240
And factory boost is 7psi... I don't know where you read it was 11!
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Incorrect sir... The factory actuator has a spring rate to hold 7psi and the standard Silvia has a boost solenoid (as do most all factory turbo applications) to maintain 10-11psi. This is done so the ECU can limit boost supply if there is an issue (high coolant temperatures, etc.)
Saying an S13 SR20DET's factory boost is 7psi is like saying an Evolution's factory boost is 10psi. They use a boost solenoid to achieve the factory 19psi. An S13SR is a dog at 7psi