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Correction: TXS had the problem on an APS ST car past 10 psi, so I am assuming a fuel pressure problem. The gauge is goin on as I type. Update to follow.
That was actually my car they had a problem with when testing the initial UTEC units.What we found is that at 13psi and about 480whp the APS fuel system could not keep up.We upgraded to 650cc injectors at that point and are going up to 750cc now.
