So I dynoed my Sc400 a couple months back, and now I have decided I want to make a bit more power. So I have been looking into an apexi SAFC. The AFR on my dyno sheet at 3500 is around 15, as I pass 4k RPMs it gets under 12 is this good? I am unclear on what the optimum AFR number is. Lastly I am going to be doing a single din head unit soon and was wondering can I put the SAFC under the headunit on the dash kit to fill up the space?

Thanks.

 

if you are all motor, you want 13's under WOT, 15's are ok if you are just crusin

 

At startup, my AFR is 15.5-16.5. Cruising (no boost) at 70 mph and 2500 rpm, it's around 14.7-15. Under WOT, it's around 11-12. Sometimes it's 10.5. But I enriched the fuel for my turbo so that's the only difference between NA and NA-T under WOT. For your car, I think that's normal. Your AFR at 3500 rpm at 15 is a little bit lean, and passing 4000 rmp at 12 is ok. The SAFC isn't really needed if you don't run a forced induction system. You may get knocking if you lean out too much.