Hi guys,
Was just wondering what is a normal A/F ratio under boost. After my flash my boost is reading down to the 9's when I'm boosting in any gear. However under normal driving and cruising it is reading in the 14's. I am worried that I might be too lean under boost. So was just wondering what is a normal A/F under boost. Thanks

 

I assume you mean your a/fs are down in the 9s and not your boost as you state. You are definately not too lean under boost if you are in the 9s.

 

Yeah Im sorry. I should have clarified. Yea I meant my A/F ratio is down in the 9's. I was wondering because I know the turbo is sucking in all that air but I didnt think it would drop THAT much.

 

the lower the number (a/f), the richer you are running. 9 is extremely rich, even under high boost. At cruise, you should be at 14.7 ideally, but anything above 14.0 is fine, as you can run leaner ratios for better fuel mileage when you're not under heavy power.

Lower number - richer....... higher number - leaner.