Hi guys,
I have a C7 LT1 M7 with a D1X running a 3.5" pulley, Tial Q BOV with -2 spring, LT4 fuel system, MTI Secondary Low-Side Fuel Pump, Alky Control Meth, long tubes (no cats), forged pistons...etc
When I rev the car at a standstill, not in gear, above about 5000RPM, the engine runs away and hits the rev limiter. It will continue to bounce off the rev limiter until I switch the engine off.
Similarly, when I'm driving the car relatively hard and change gear around 5000-5550rpm, if I do not perform the gear change instantly, the revs run away up to 6500 and start bouncing off the limiter again. As soon as the gear change is completed, the revs drop back down again.
I've had a brief look at the HPT logs and it shows the desired throttle position as being a realistic number (not 100%) so i dont think its a problem with the pedal position sensor
In fact I'm not entirely convinced that this is a tuning issue as I've had my car tuned (from oem stock tune) by two different tuners and both have encountered the same issue.
I did wonder if my BOV wasn't capable of discharging all the boost that the D1X is making, and thus forcing open the throttle blade? But, the specs on the TiAL BOV (and yes it is a genuine one) say it is rated to 1800whp which I'm nowhere near making. Unless of course this is a S/C specific issue and the HP rating is for turbo apps?
Has anyone else encountered this problem? I'm reluctant to drop $250 on a secondary BOV to test my theory unless its the most likely cause.