View Full Version : air/fuel ratio

09-01-2002, 11:24 PM
Any one know what the stock air/fuel ratio on a '98 Cobra is? I am currently at 10:1 to 11:1 through the rpm range. Looks very rich to me. Thanks.

09-03-2002, 05:49 PM
Not sure what stock is, but right around 13 is where you want to be. Had mine dyno tuned a few weeks back and they tuned her a/f to hover around 12.8....but I am N/A. Those numbers will change with different power adders.
Hope that helps.

09-03-2002, 06:32 PM
Thanks, that does help. I've heard and believe you want to be around 12.8:1 to 13.2:1 for max power with a N/A car.

Tim Lester
09-04-2002, 10:39 AM
You might want to search the corral.net,you want the A/F ratio to be in the 13.5.1 to 13.7.1 for best N/A power.

09-04-2002, 05:08 PM
"13.5.1 to 13.7.1 for best N/A power"
I thought it was to be a little higher than 13.0.1 too, but on the tune I gained power when he dropped the numbers from the 13's to the 12.8. I'm sure it has to do with the mods and air conditions at the time. Hey...Take the average of the numbers and try to stay in the low 13's :)
Anyway...if your mesurement is accurate you are WAY rich and need some adjustments.
Good Luck!