Okay so i just recently put crower 2 cams in my car and wideband of course. What is the best AFR my car should be running at?

 

For lowest emissions, 14.7:1, as most cars come from the factory. For best performance, I believe 12.8:1 (most power) to 13.2:1 (most torque) is the range you want. Cruising: you could potentially go up to 15.0:1 to 16.0:1 under the right conditions. Also, you need to take into consideration the temperature as that will affect A/F ratio as well. If your area is normally hot, and you tune for max power on a much colder day, you could very well have trouble when it's hot again.

 

Thanks! that was really helpful