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Old 05-21-2000, 06:48 PM
Join Date: Apr 2000
Location: Huntington Beach, CA
Posts: 1,705
While watching racing (stock car, indy car, touring car, etc.), I notice that when the cars are following the pace car, they are constantly swerving left and right until the pace car leaves the track. Why do they do this?
Old 05-21-2000, 06:50 PM
Join Date: May 2000
Location: Glenview, IL
Posts: 2,268
If my race fan buddies are correct, they are "heating up the tires", causing friction to get the tires to grip better in the race.

Old 05-21-2000, 08:28 PM
Join Date: Oct 1999
Location: Santa Rosa, CA
Posts: 4,609
It's called "scuffing" the tires. Chandeleur is basically right. Swerving back and forth heats up the tires and also scrapes off the "mold wax" or oily coating that the tires come with from the factory, which improves traction.
Old 05-21-2000, 11:25 PM
Join Date: Sep 1999
Location: KCMO
Posts: 3,330
Hot tires are sticky tires. Same reason that drag cars smoke their wheels before the race.
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Old 05-22-2000, 08:42 AM
Join Date: Oct 1999
Location: Houston, TX USA
Posts: 842
I had heard that it lets them drive faster. By swerving, they increase the distance that they travel, compared to driving straight. This lets them drive at higher speed than the pace car.
Old 05-22-2000, 09:00 AM
Join Date: Jan 2000
Location: Once, 200 mi. from Felch
Posts: 3,709
starfish - what??

Everybody else has got it. It has to do with evenly heating the tires, across their entire surface.

Generally if you see a pace car out there, it means they've been at yellow, which probably means they all pitted and got new tires.

When the difference between first place and 25th is about 1 mph, every little temperature degree and pound of air pressure matters.
Old 05-22-2000, 09:50 AM
Join Date: Dec 1999
Location: Southern CA
Posts: 3,561
My father worked pit at Indy for nearly a decade, so there's my credentials.

Basically: What Democrirus and Chandeleur said. They're warming up, heating up, the tires to improve traction.

Something else to consider--those tires are about $5,000 apiece. Multiply that times the multiple pit stops--where all four tires are replaced every time--and you've got a serious expense, just for the tires!
Rule number one: Horse people are nuts.
Rule number two: If you don't know any horse people who are nuts, it's YOU.
Old 05-22-2000, 03:33 PM
Join Date: May 2000
Posts: 277
There is also another reason to swerve back and forth. Say this is the second yellow flag in 15 laps and the leaders stay out to keep track position. When they slow down, the now hot, sticky tires will pick up small pieces of rubber from the track. If the don't scrub these back off before a restart, the car is hard to control for the first few laps back at speed.
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