A/F Numbers

[nelly1]

What numbers would I be looking at for the optimum performance using a A/F gauge?

Thanks, Alan

[socal pat]

What numbers would I be looking at for the optimum performance using a A/F gauge?

Thanks, Alan

Power-wise 12.5, but for safety 11:1 so I personally go for between 11 and 12.

[MiataMTF]

12.5-13.0 below 4K RPM dropping to 11.5-12.0 at redline AND a knock-sensor or timing card. I'd keep it below 12.0 without timing control.

[ThomS]

The perfect numbers for most driving will be 14.7 except under boost, then the other guys right right.

[nelly1]

OK, here's the deal. My car is a 95 with a 115 mm pulley. The best gas I can get in this location is 91 octane. I use a fuel additive for what it's worth. I have a A/F gauge, fuel pressure gage set to 60 pounds. I have not heard any ping although my hearing ain't what she use to be.

Under no load at idle she is at 14.7 14.6. Normal driving gage reads 14.2, under slight load it will drop to 13.8. Now depending on what gear I have it in
and

when it goes into boost it will drop down to as low as 10.5. I had it out yesterday and going about 100 mph in 5th, pedal to the metal and the A/F read 10.5. That being said, the PC pro is maxed out in all parameters .

Am I running this to rich?

[socal pat]

Ahhhhh YUP. Your off boost numbers look good. On boost it should not be around 10. Especially that long steady state boosting you'd see going 100mph. As said before just below 12:1 is a good safe place to be.

[Lee_The_CI]

Pat,
Just out of curiosity, what are your PC pro settings, main and ecard?
We have pretty much the same setup and I was just wondering what you are running.
I have a 2000, 115mm pully, rb header, goodwin midpipe and muffler.
Thanks
Lee

[socal pat]

Can't remember off the top of my head. I'll be driving the car tommorow I think so I'll check it out and let you know.

[Lee_The_CI]

Thanks.
I will check tomorrow.