Happy new year! Searched this high and low to no avail. Stock 850 turbo makes 9.6psi. R's make about 10.6psi or so I think. Does anyone know how much the stock ECU and the R's ECU will allow before fuel shutoff if I tinker with boost pressure? Thanks

 

15psi if im not mistaken

 

R can control 14.5psi with no issues! I run mine at 14. Occational flare to 15 then settles to 14! Remember too the wastegates are different on both models. Need to set waste gate properly to prevent over boosting! No sure what a stock one can handle would assume maybe 12-13 no issues?

 

I still wouldnt run 14 psi on a stock ecu without a AF gauge,
you need to watch how lean you are running