I had my car dynoed today and the air fuel ratio was real high like 17 to 1 when we did a cruise run but when we did full power runs it leveled off both times to 13.2 should I be concerned or not. It put down 335 rwhp 348 rwtq. He showed a little detonation but I think it was from the car sitting and not being driven much in the last two months.


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2002 Sunset Orange Trans Am ws6, m6, magnaflow catback, eibach pro-kit springs, tinted windows and silver decals.
Next Mod- Headers, Heads and Cam, and computer tuning.

 

It appears from the data that you show with the graphs, that the a/f for Run 004 wasn't 17.1. It averaged 13.6 according to the print out. Looks like to me she is still a tad lean at WOT... You put her on the street and she will be even leaner.

 

yah but how was teh a/f reading taken...was it just a tailpipe sniffer through his cats? i tend to not trust a tailpipe sniffer 10 feet downwind of your engine/cats.

 

yeah it was in the tailpipe would it be possible that doing the free ram air mods, air lid, air filter, and exhaust would increase the air flow to where it now runs lean.

 

your mods may lean it out a little bit but your stft/ltft should adjust accordingly, detonation possibly due to lean with bad gas.