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Message: [QUOTE="Blowby, post: 329343, member: 711"] Correct! Example: Spring force on valve 17psi and you can only make 25psi of boost. - As the turbo starts to spool your drive pressure will be rising at or higher than boost pressure. So lets say that as you hit 20psi boost (regulator wide open) and your drive pressure might be 35psi (since you said yours might be high). You are getting close to, if not already cracking the seal because the drive pressures are pushing up on the face of the valve. Now as you keep your foot on the throttle drive pressure continues increasing at a faster rate than boost is increasing so by the time you hit 22, 23, 24 psi the drive pressure is bleeding off a large amount and the boost pressure stabilizes because of the "leak" in "drive" pressure. The waste gate is doing what it was designed to do by controlling the boost pressure by bleeding off drive pressure. To resolve this you need to add a higher force spring or more air pressure on top of the gate by a external high pressure supply. Or the turbo is not designed for your power, fuel needs. You could also have too large of a gate installed and as the valve starts to crack open it looses too much drive pressure too fast. [/QUOTE]

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