Car isn’t consistent

I’ve been having consistency issues with my car I’m running e85 and a lito tune, car is NA and pretty basic. Last year I could run high 12’s pretty consistently with a worse 60foot in the heat but now it’s all over the place. Last weekend it went 12.83 at 100 and I was off the gas at the end…then it proceeds to run 12.90’s to 13.00’s at around 106(same day) one pass was 107. Sometimes it’ll go from 82 in the 1/8 to 83,84, or 85. I’ve got a shift light so I know I’m shifting consistently. Lito is using a bullit tune file for my tune which uses knock sensors. Could the 2 step be making those go off? Any suggestions would be appreciated. Thanks. Time slip picture was posted from today.

It could be knock or false knock. Have you datalogged your runs and compared them?


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07gts197 said:

It could be knock or false knock. Have you datalogged your runs and compared them?


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No I have not. I’m not too familiar with looking at a datalog file and comparing the two. I was thinking about putting it on a dyno and having it dyno tuned over the winter.

Jake Schmale said:

No I have not. I’m not too familiar with looking at a datalog file and comparing the two. I was thinking about putting it on a dyno and having it dyno tuned over the winter.

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You could log a few and we can read them before spending money on a dyno tune.


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Post multiple timeslips. Trap speed and ET will change with your 60 foot.

jewc75 said:

Post multiple timeslips. Trap speed and ET will change with your 60 foot.

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Here are some more time slips of the car including it’s best ever et(12.70) with a 1.69 60 foot

There are too many variables. Temperature, Humidity, What tire are you running, What is the air pressure? More info might get you some better answers.

The passes you made on the same day look to be getting slower with every pass. Temp is going up. You're hot lapping the car. Tiny imperfections in your driving. Even with a shift light you're not going to be dead on every shift. Some of your 1000ft times are very close considering the variance in 60ft. But the final mph is falling off later in the day. Once again pointing to heat soak and/or high humidity. You're time slips are very much what I would expect.