car slowing down

331mustang

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I've got a 94 gt vert with DSS 331 c4 with brake.first run out every weekend it runs a 12.02 with usaully a 1.566 60ft then it starts slowing down every run .went out today 1st run 12.02 with 1.558 60ft.becoming slower each round till finally 2nd elimination round it went 12.181 with a 1.603 60ft.any suggestions on what to do
 

Magic

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do you have enough cool down time between runs?
track tempurature changes throughout the day?
track prep at the line?
air tempurature changes?
winds?
change in launch technique?
equal burnout times?
tire pressure consistent between rounds?

compare your 60ft and 1/8th mile times.

If you car is slowing down a cpl tenths, then IMO its nothing all that serious. But try and look at the "obvious" and compare them between runs.
 

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