Ok, I have a second Walbro 255lph pump that is controled by a Hobbs switch at 5psi. What happens is it kicks on and my fuel pressure jumps from 56ish to 61psi in a nanosecond -- the wideband goes to rich and clouds of black smoke ensue and thre truck begins to feel like an earthquake simulator
So I know that at my altitude, 5psi is 135kpa and I know I need to reduce the VE boost to account for the second pump.
The question is: How much? I guess I can autotune them but since the wbo2 is just reading rich (aka 9.0 AFR) It's not going to be a one shot deal. I'd rather calculate /estimate how much to pull from the table and at least get it to 10ish AFR and autotune that. The big deal of course is to do this without blowing the motor by setting the boost ve too low
Anyone have any ideas?