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?