dgantt

Hey all,
I have a FAST system on my car and want to tinker with the fuel to air ratio. It is set to 12.5/1 at WOT now. I am running 6 degrees timing.
I have a great ignition system MSD 6AL, blaster coil and 8mm wires with new plugs. I always run 93 octane fuel. I think I'm good to change the AFR. I have read that N/A cars run best between 12.8 to 13.2 also should I advance my timing to around 8 or 10 degrees? How will the knock sensor react? Thanks for all comments

84Z51J

No way to know what's best, unless you test yourself! Only dyno runs can determine beyond the shadow of a doubt what A/F and timing make optimum HP/TQ on your particular engine. If the KS is doing its job, you shouldn't have to worry about serious engine damage as you tinker (within reason). Err on the rich side as excessively lean can destroy the bottom end very quickly--but at 13.2:1, you'd still be well outside the danger zone & safe to experiment.

dgantt

Just found out the FAST system eliminates the knock sensor, I guess I will be staying at 12.5

MrWillys

Keep it at 12.5 as a daily driver, but on track day change it to 13 :<)

383vett

12.5 works for me at the track.

Tom400CFI

You need to "feed it what it wants".

Aardwolf

12.5 to 12.8 was a 10 hp increase on my combo.