Quote Originally Posted by 5.7ute View Post
No, what I am saying is an error in B3601 will bring errors into AutoVE if commanding away from stoich.
An easy example would be like this.
lets say cylinder airmass is 0.62 G/cyl. commanded afr is 1.14 EQ and the IFR is 5.0 G/sec. Offsets we will leave at 0 for simplicity
B3601 set to 14.63

IBPW = 0.62/(14.63/1.14)/5.0
IBPW = 0.0096623 sec

B3601 set to 14.04

IBPW = 0.62/(14.04/1.14)/5.0
IBPW = 0.0100683 sec
A difference of 0.000406 sec or near 1/2 m/sec in commanded pulsewidth.
I havent fully worked this out yet & could be chasing shadows or just plain overcomplicating things. Time to fire up excel & do a little math.
Yes, a drop in B3601 will increase injector pulse width because you're telling the PCM the stoich AFR of the fuel you're using is richer. So, it almost goes without saying that the injectors will need to stay open longer. That's why it's important to understand what you're putting in your tank.

For me, I thought I was doing a great thing going to Sunoco and getting 94 octane gas...until I noticed it has a higher octane rating partly because it's 10% ethanol.