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Here's a calculator that will let you compare times by heat, humidity, altitude and air pressure. Look around, you can also compare times at different tracks and different days.

http://www.dragtimes.com/da-density-altitude-calculator.php

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hey thanks for the cool link. here is what it came up after i put my info in.

http://www.dragtimes.com/da-density-alti...rect+ET+and+MPH

thanks Mopar65

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Idon't have much seat time in this car but hot weather usually takes 2-3 tenths from a car. You can be more consistant if you run a cool can, but I think it will still slow down some.

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I dont even think those cool cans from years back are
legal anymore... different fuels will make it less
susceptible to heat changes.... my car only changes
a couple hundredths max on E-85

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As a rule of thumb, a well prepped drag car on gas will change about .01 per 200 ft DA change. My Dart on Alcohol changes much less, about .01 per 400 ft DA change.
All this depends on tuneup and traction of course. On a really hot day I expect to lose some 60 ft.

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well my car is far from being well prepped. i am getting ready to put a pair of 650DP on my car and would love to convert them to e85. But dont know anything about the stuff or have the money to convert them right now. I am runing 93 pump gas because i am right at or a little under 11.1.1 compresion. Mopar65

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Well, mine went 6.58 in the cooler morning and then 6.47 in the heat last week! MPH got better too! I will let you guys figure that one out.

Temp was reading 99* in the sun, 88* in the shade. Launch rpm, shift rpm, everything pretty much the same.

The 6.58, the motor was still not fully heat soaked, and the 60ft was off thanks to the burn out. Typically its a 6.52, which is what the 2nd pass was, but we did not expect to dip all the way down to 6.47 on a hot day. The next couple of passes, the car just got faster on every pass with no changes on my end, just getting a better burn out than the 1st pass and trying to be consistent with motor launch temps. Motor is still a little tight, and the chassis might be as well. So in the heat of the day it was right around 6.49, then it cooled down a little to about 83* and we got the 6.47.. The car's record was 6.44 on a nice cool night so, not bad in the heat. We run pump gas, and i think it changes more than it really should, but we are still learning with 90 actual full passes on the car now.

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Well, mine went 6.58 in the cooler morning and then 6.47 in the heat last week! MPH got better too! I will let you guys figure that one out.

Temp was reading 99* in the sun, 88* in the shade. Launch rpm, shift rpm, everything pretty much the same.

The 6.58, the motor was still not fully heat soaked, and the 60ft was off thanks to the burn out. Typically its a 6.52, which is what the 2nd pass was, but we did not expect to dip all the way down to 6.47 on a hot day. The next couple of passes, the car just got faster on every pass with no changes on my end, just getting a better burn out than the 1st pass and trying to be consistent with motor launch temps. Motor is still a little tight, and the chassis might be as well. So in the heat of the day it was right around 6.49, then it cooled down a little to about 83* and we got the 6.47.. The car's record was 6.44 on a nice cool night so, not bad in the heat. We run pump gas, and i think it changes more than it really should, but we are still learning with 90 actual full passes on the car now.

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The first pass was slower ey ? Was the eng warm enough or did it spin. Alot of times if a car gets faster in hotter air it may be a little lean. Ron

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Might be lean.... but also the first pass of the day
for me is usually a bit slow...due to all the parts
and fluids not warmed up all the way... even warming
it up in the pits(I tend to drive around to warm it up)

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Don't have DA #'s but in cool, crisp mineshaft air (Atco) I would run 2-3 tenths quicker, and 2-3 mph faster than I have been in the heat and humidity lately.

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Atco or Cecil when the air is good yields great times. Went our best of 9.94 at 135 at Cecil in less than ideal conditions (hot, but dry) and 10.11 at MIR in high heat/humidity.

Jeff - I bet you still have an old cool can...

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Don't have DA #'s but in cool, crisp mineshaft air (Atco) I would run 2-3 tenths quicker, and 2-3 mph faster than I have been in the heat and humidity lately.

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Atco or Cecil when the air is good yields great times. Went our best of 9.94 at 135 at Cecil in less than ideal conditions (hot, but dry) and 10.11 at MIR in high heat/humidity.

Jeff - I bet you still have an old cool can...

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