1st Time 1/4 Mile A Car. Weird... - Ford Mustang Forum
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post #1 of 8 (permalink) Old 06-20-2015 Thread Starter
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1st Time 1/4 Mile A Car. Weird...

Questions, but 1st some background. Have about 15 runs drag racing motorcycles, last night was the 1st time putting a car on the 1/4.

I have a stock daily driver 2012 Mustang GT 5.0 Auto, axle backs and wider(street) Sumitomo tires, 255 front/275 rear are the only mods. It even has the original paper airfilter and stock tune. Rear tires @30psi.

Heat index was close to 100 degrees, sunny(Gainesville, FL), my 1st run was [email protected], 60 ft was 1.99. No burn out, hooked up ok off the line, very little wheel spin through 1st gear.

Weird part is, it was the fastest pass I did all day/night. I couldn't beat or even replicate it. After the 2nd pass the tires would not hook up at all. 1st 3 runs I didn't do a burn out, 1st 2 hooked up, 3rd spun up through 1st and into 2nd gear.

So I did a little burn out for the 4th, wouldn't hook up. Same with the 5th. Why did it hook up so well the 1st 2 runs but none others??? I was going to drop the tire psi from 30 to 24, but was told doing that with street tires won't help.

It's my daily driver, so not looking at getting drag radials. I drive 25,000 miles a year.

Maybe the initial heat of the day sapped some hp/tq, enough to not spin the tires much? The cooler temps of the evening reduced traction and increased hp?

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post #2 of 8 (permalink) Old 06-20-2015 Thread Starter
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Oh, and I did a more aggresive burn out for the 5th run. Did not help.

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post #3 of 8 (permalink) Old 06-20-2015
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Maybe your first time with a car, you were more cautious with the go pedal, got good traction and rolled into it. Then you might have been trying to lower your ET and started subconsciously hitting the gas too hard.
Also I've read and heard that burn outs through the water box are a no no for street tires. Although some have had success warming them up dry.

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post #4 of 8 (permalink) Old 06-20-2015 Thread Starter
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Good point, didn't think about that. I know on the 3rd pass I snapped the throttle open hard, the 4th and 5th I tried rolling on it smoothly.

I never used the water for burnouts, just drove around it. Kept the trac con off for every pass also and never used the decline assist button. Windows up, A/C off as well.
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post #5 of 8 (permalink) Old 06-20-2015 Thread Starter
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And I also stripped my trunk, 1/2 tank fuel.
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post #6 of 8 (permalink) Old 06-21-2015
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Track conditions and or weather could have played a part in the difference.
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post #7 of 8 (permalink) Old 06-24-2015
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If you're going to hit the drag strip more often, I'd invest in a spare pair of tires. Sticky tires will make a huge difference. (suspension upgrades help too. UPR!)
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post #8 of 8 (permalink) Old 07-20-2015
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at that temp and humidity chances are your car also got hot - which kills power - these cars love that cool intake air - example best time in my car was at 50 degrees air temp and love humidity - the DA can make a huge difference- in extreme cases up to 3/4 of a second on a NA car- I have found a minimum o 20 minutes between runs on hot and humid days -
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