Can heat cause this much?
05-23-2004, 05:41 PM
#1
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Can heat cause this much? Long story short I went to the track about a year ago and ran:
60' - 2.154
1/8 - 8.623
MPH - 85.668
1/4 - 13.181
MPH - 107.464
This was on street tires. Since then I have added:
Hypertech 180* thermostat, BMR Lower Control Arms, BMR Panhard Rod, BMR Strut Tower Brace, ASP Underdrive Crank Pulley, and BFG Drag Radials.
Today I ran a best of:
60' - 2.080
1/8 - 8.796
MPH - 82.681
1/4 - 13.502
MPH - 103.934
The big difference is the weather, one year ago, it was about 65 - 70* and not too humid. Today it was about 85 - 90* and really humid. Can temp. and humidity cause this much of a loss? Also I ran two other runs today and they were almost the same. So I lost 3.53 MPH and 0.321 in the 1/4. But I should have gained some with the pulley and the lower 60' time. However I did bog pretty bad out of the hole with the DRs, I was launching at 3000 but it still bogged. All help is appreciated!
60' - 2.154
1/8 - 8.623
MPH - 85.668
1/4 - 13.181
MPH - 107.464
This was on street tires. Since then I have added:
Hypertech 180* thermostat, BMR Lower Control Arms, BMR Panhard Rod, BMR Strut Tower Brace, ASP Underdrive Crank Pulley, and BFG Drag Radials.
Today I ran a best of:
60' - 2.080
1/8 - 8.796
MPH - 82.681
1/4 - 13.502
MPH - 103.934
The big difference is the weather, one year ago, it was about 65 - 70* and not too humid. Today it was about 85 - 90* and really humid. Can temp. and humidity cause this much of a loss? Also I ran two other runs today and they were almost the same. So I lost 3.53 MPH and 0.321 in the 1/4. But I should have gained some with the pulley and the lower 60' time. However I did bog pretty bad out of the hole with the DRs, I was launching at 3000 but it still bogged. All help is appreciated!
05-23-2004, 06:44 PM
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and your 60' was better so that shows the control arms and dr's were doing their job, try launching at a higher rpm next time untill the tires spin a little bit.
05-23-2004, 08:25 PM
#4
in just ONE day, from early morning to afternoon i went from 12.7's to 13.1's and thought the car was messed up. next weekend early morning was back to normal times. if you got a chance, just play with the weather/DA calculators to see the differences from even just weekend to weekend.. guess it's time to wait till fall for the good air again 
05-24-2004, 09:02 PM
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not uncommon to slow down 3-4 tenths from good air to bad air (summertime). Every 1000 ft of altitude is about a tenth (give or take a little) of et, that's why I run 11.30s in good air and been high 11.50s and low 60s so far with the DA about 2700 ft.
Derek
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05-24-2004, 11:59 PM
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Originally Posted by Villain281H
not uncommon to slow down 3-4 tenths from good air to bad air (summertime). Every 1000 ft of altitude is about a tenth (give or take a little) of et, that's why I run 11.30s in good air and been high 11.50s and low 60s so far with the DA about 2700 ft.
Derek
Derek