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Originally Posted by
Terry@BMS
Yes, with the JB4 in place fuel pressure is reported back as slightly lower than actual so you trip the injection fault earlier. But doing max torque runs @ < 1000psi fuel pressure is not a good idea IMHO even if we could just turn off the code all together. On the JB4 end though I can raise the scalar for you on the flash side, so you can lower open loop, and run that low pressure, if you don't mind taking the risks, but you are only removing the last bit of safety we've placed in there, maybe its 20hp more worth of fuel? Stuttering is much worse than the cutoff IMHO. Who knows what's going on in combustion when it leans out like that. I prefer the total cutoff.
I agree, I don't like the engine stuttering like that, but up until the original DME failed, HPFP fuelpressure never dropped under ~1500 psi, and there was no stuttering, so I think the HPFP is on it's way out. Regardless, it was interesting to me how different tunes come up with different codes for what is basically the same issue. Hopefully I should have the VTT modified HPFP in a few days, so I can start testing again, and then I'll send you some logs. Don't really want to stress the car as it is running atm. "
