Reviewing some logs a customer sent me before I start changing anything after being at another shop.
I noticed his barometric pressure sensor reading rising with RPM during a WOT.
It reads correctly for our near sea level elevation at idle, 100kpa, but over a pull at the drag strip, it peaks at 108kpa. I thought at first maybe the air intake set up he has that was pulling air from the front grille was actually pressurizing the airbox but the baro peaks line up with RPM peak and not vehicle speed so that rules that out.
P2227 is disabled in the current calibration, possibly because it was throwing this code on the dyno while being tuned.
Basically p ratio drops as RPMs increase, which in a car with a steady baro reading and a intake set up that normally drops MAP as RPMs rise due to restriction, P ratio drops just for a different reason.
Don't think it is causing an issue at this point but the car is currently in MAF only mode but I am going to calibrate the VVE so just making sure I don't have any issues there.
Set up is an LT1 with TSP CNC heads, TSP VVT-3 cam with a phaser lockout kit, TSP long tubes, LT2 intake and LT5 TB, Rotofab intake. Customer did all the work himself.
Thanks in advance!
drag 2.hpl7.9.23 MAF Adjust WOT3.hpt