Fuel trims - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

moE_09 · 07-02-2015, 07:36 PM

Just a question about fuel trims and a/f ratios. On my stock tune my a/f ratio would never leave 1.0(command equalance ratio) and my short term fuel trim would vary between lean and rich like normal And my
Long term fuel trim was very steady. After my tune, ratio drops to about .81 on heavy acceleration ( which I've read places that it's normal), and on my tune my STFT switches back and forth. And so does my LTFT. At idle not to much. But more under acceleration. Are these things normal or should I have a talk with my Tuner ?

07-02-2015, 07:36 PM	#1
moE_09 Drives: 2014 v6 Join Date: Nov 2013 Location: NY_LI Posts: 395	Fuel trims Just a question about fuel trims and a/f ratios. On my stock tune my a/f ratio would never leave 1.0(command equalance ratio) and my short term fuel trim would vary between lean and rich like normal And my Long term fuel trim was very steady. After my tune, ratio drops to about .81 on heavy acceleration ( which I've read places that it's normal), and on my tune my STFT switches back and forth. And so does my LTFT. At idle not to much. But more under acceleration. Are these things normal or should I have a talk with my Tuner ?