NA 4.6 with cams stage 1 ...best AFR?

[east_sidaz40]

Hi,

Where should i keep my AF ratio at?
99 GT stage 1 ported heads + cams.
12.0 -12.5 ?
I want a safe Ratio for NA

 

[oxfordgt]

12.5-13.0 for best power. Stock is already 12.0. The tune will be safe at 13 as long as you keep the timing in check so you don't detonate.

13.0:1 is always the best a/f ratio for power. Even on my car that makes 700rwhp at 23lbs of boost is tuned to run 13.0 at WOT but I spray meth on top of that the keep it safe.

 

[bhuff30]

Yup, right on. I would probably shoot for 12.9:1-13:1 on an NA engine.

The stock tune on my 97 starts around 13.4:1 in the mid range and drops to about 12.2:1 at high rpms. Just terrible.