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Re: Why will Procharger P1SC not take timing?
The clue is your comment about the problem occuring at high RPM. At a guess, I'd say you don't have enough fuel pressure. If you're using the LS1 stock fuel pump, it barely has the b*lls for 5 PSI, never mind 7, when you got WOT at red line. As boost increases, pressure drops and the system leans out because the pump can't push enough fuel. AFRs may look "good" superfiecially, because they're lean, but at high boost to keep from pinging you actually want to be rich.
If I'm right, you're going to have to do what I'm planning to do for my Vortech setup (which does have an aftermarket high volume pump but is still marginal at WOT and high RPM), which is to run a return line and put a boost-referenced regulator at the front of the car.
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