this is my data log from a 1/4 mile run, the A/F goes from .99 to .68 which is 14.7:1 to 9.97:1 command air/fuel ratio. Now I can reset my "learned" fuel trim settings, but what else would help correct that with out tuning? I am looking at getting LS2edit since I am an 08 and HPtuners isn't out for us. I know I am making good power from my dyno sheet (171whp) but i know more power is there. the odd thing is though my dyno says i was running lean but the dashhawk says the PCM is calling for a pig rich a/f ratio?!?!?! please help!

 

So your PCM was commanding very rich and your dyno didn't get rich till the end of the pull.

Interesting. Where was the dyno AFR reading taken from. Downpipe, header, or tailpipe.

 

the dyno was tailpipe snuffer, and the dashhawk i think is just a grouping of sensors and it is telling me what the PCM is telling the car to aim for.

 

From what I understand the tailpipe sniffer should be like a full point off on AFR. Not sure how true that is.

 

well it is still differing like 4+ points, also these weren't on the same day either. but it shouldn't be that far off.

 

Honestly I have no real clue. I mean there are so many factors. Need a tune, exhaust leak, inproper callibration. Could be many things.

I wouldn't rule anything out unless you get a wideband guage installed.

 

right I was just wondering the car runs great but I just noticed it.

 

bump anyone have input?