V8cobra99 Posted February 1, 2005 Posted February 1, 2005 I had my Mustang Cobra dynoed for inspection this year. I noticed that the air fuel ratio got down to 12.1 to 12.5. How much of a risk is this, if at all ?? Thanks, andy Quote
Hal Posted February 1, 2005 Posted February 1, 2005 The low side numerically is the 'safe side.' Meaning slightly rich is better than lean especially as it pertains to cylinder number 7 and 8 in a 32V Cobra motor. If you get too rich you will wash down the rings and dilute the oil with fuel (not good!). But that's not the case with the numbers you shared. If you see your Cobra going to high 13 or 14s in a controlled environment like a dyno you run the risk of encouraging detonation. Quote
turbolx Posted February 3, 2005 Posted February 3, 2005 Mid-low 12's is just about ideal under WOT for a naturally aspirated road race car without catalysts. Remeber, fuel is cooling the valves in addition to controlling combustion against detonation. Best power is slightly leaner (13.2-13.4), but durability is the primary focus here. Keep in mind that while certifying on a Dynojet, you have slightly less load on the engine than on track, which can skew things. I would leave the tune alone. Quote
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