| There are two different "max" boost situations that you're referring to One is where the turbo is no longer efficient, and raising the boost only raises the temp of the intake charge, resulting in no extra power (and power loss). the other is where the wastegate flaps open, dumping boost into the exhaust. Where this happens is a function of both the size of the wastegate, and the force applied to the other side (pressure = force x area). A larger wastegate needs a larger force to keep it held closed. A larger wastegate with the same force holding it closed is opened by a smaller pressure. End result: larger wastegate needs a larger force to keep it closed to hold the same pressure. The stock wastegate actuators just aren't strong enough.
Joe
Engine Rebuild in Progress: Sport 530bb's + Inconel :-)
AIM: hoyatiger81
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