Drag Racing Tech - How much does heat hurt track times?
06-29-2004, 12:16 PM
We ran our cars a few months ago in about 55 Degree weather and hooked fairly decent (1.62 60' and 12.04 @110mph for me). Since then I've lost about 75lbs, got better shocks(Strange over QA1), added a S3 throttle body, pulled the front swaybar. We ran this past weekend in 90+ weather and my average pass was 1.67 60' and 12.10 @112. Does the heat kill times that much? Does this sound right? I was hoping for my first 11 second pass, but no dice. G5X3 coming soon. :)
06-29-2004, 01:26 PM
Weather is everything when it comes to quick et's(along with traction). From my experience, you can loose 3-4 tenths from 55-95 degrees in an 11.50-12.50 car. Especially if the humidity is very high also. A hot track is harder to hook also. My favorite weather is 45-52 degrees with a high baro and direct sunlight. Thats when you will see your best times usually. Cool, dense air for power and enough heat on the track to hook hard.
06-29-2004, 02:40 PM
So it IS harder to hook on a hot track. I was wondering why I was hooking harder in cooler weather. Weird. I know the car has 11s in it as it sits. Ah well, Bogarts and a set of M&H tires should help put me over the top no matter what. Watch, 12.001 HA! I'd be pissed. :)
06-29-2004, 03:12 PM
Just to show you how dramatic it is-check this out:
Last season I was at the local track and the weather was in the 80's. I made two time trial passes about a half hour apart. Run 1-12.67-86 degrees.
Run 2-12.61-80 degrees.
Round 1-Dialed a 12.58, ran a 12.60-78 degrees
Round 2-Dialed a 12.55, ran a 12.57-74 degrees
Round 3-(really cooled off now) Dialed a 12.49, ran a 12.45 and broke out-67 degrees.
It kept getting chillier, and I didn't know honestly how much the car would pick up, so I didn't know what to dial. I broke out. Yeah, temp. can affect big time.
06-29-2004, 03:40 PM
Generally speaking, roughly 1 tenth and 1 MPH per 10 degrees. Add humidity, a headwind, and a crappy barometer and it can leave you scratching your head.
I ran 13.49 at 101.5 MPH in my C5 (bone stock) the other day. 99 degrees + 29.95 barometer + high humidity = SHITTY! :nono: I would be willing to bet you that the car would be in the 12s with some dry 50 degree air/30.1 baro conditions.
06-29-2004, 04:01 PM
That's nuts! I never knew it made THAT much of a difference. :confused: Well, I guess I'll have to wait for my 11 second pass. :(
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