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Hello Warren:
Do you have the original O2 sensor in your car? The car was running smoothly and powerful before I put in the G-valve. After I put it in, the car ran more smoothly and powerful at all rpm, both very plesant and a bit scary because the boost needle would hit two O'clock (around 10 psi) in less than wink. There was some drivetrain rumble at 5,000-6,000 rpm, but the engine felt silky smooth. Then, I had the black smoke. Looking for a solution to the problem I temporarily disconnected the G-valve. I have a new O2 sensor and FPR in the mail (those on the car are original). When I put these on, I will put the G-valve back on. The car ran so smooth and powerful, I think it is worthwhile even to do an engine teardown and rebuild to run the G-valve at 12 psi or even 14 psi. That is, at least on a fairly new car with perfect paint and interior like a 940T. One could spend a reasonable amount of money on upgrades of suspension (IPD sway bars front and rear, Cherry Turbo upper and lower braces, urethane bushings, otherwise all new Volvo bushings, new struts and shocks), tires, brakes and headlights and have a very desirable road car for not much money. Best regards.
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