voltage ratio.

Sorry haven't been here in a while but just saw a link yesterday to this forum

In any case, I have a mustang MAF, 19lb Mustang injectors adjustable FPR and rising rate FPR when I did my turbo application. My dyno AFR was a rich 12:1 but that's because it was not fine tuned.

The only major issue with running larger injectors on a stock ECU is cold start and WOT. These are preprogrammed values that don't listen to MAF. In between (close loop), the MAF dictates the duty cycles. WOT is not a problem in fact it's the sole reason I chose 19 lbs because I can tune their delivery with fuel pressure. RPM and the fixed duty cycle takes care of the rest. That's how I ended up with 12:1

At close loop it doesn't matter because the 02 tells the ECU to reconfigure the STFT. And mine never went outside 12% so I never had a code.

In any case, I had put the A4 back to stock to get it smogged a long time ago. And I have since been tuning our TT while my wife daily drove the A4 for a while. Now that I am done with our TT (and it's track fast), and my wife has a C6 A6, I will go back and play with A4 to match our TT :)

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FAQ
Mk1 A4 - by BSK
Mk1 TT - by QuietsTTorm