Im curious about this car. Did you recently buy it with the swap already done? The s15 t28 isnt efficient past about 18psi, so youre doing more harm than good running it to 20, if that really is the case. And since the profec's default settings are about 14.5 psi with average "gain" and "set gain" I have a sneaky suspicion youre going WOT in first gear and spiking like a motherfucker.
Change out the valve cover gaskets.
BTW, what else does it have on it if youre effectively maxing out the boost on a t28?
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