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Russell,
The wastegate on my 89 (S5) RX-7's turbo cracks right around 5.5 PSI. The higher (than S4, being 86-88) boost is attained with an ECU controlled solenoid which bleeds pressure from the signal line between the compressor and the wastegate actuator. Porting the wastegate is -usually- a workable way for the RX-7's to prevent boost from creeping beyond the desired level, but I have heard of some cars with free-flowing exhaust still creeping beyond the set point during periods of extended load (ie accelerating in higher gears).
HTH
Matt
Russell Duffy wrote:
I'm also trying to pick up an 87-88 turbo actuator, which was only 5.5 psi I think.
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