Toymods Car Club Inc: General Car Talk => why do worn tyres have no grip and slicks have lots?

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Mr DOHC
Forums Junkie

Location:
Brisbane
Registered:
October 2002

Re: why do worn tyres have no grip and slicks have lots?

Thu, 25 March 2004 09:29

chalk and cheese
how long is a piece of string
why do worn tyres have no grip and slicks have lots?
ect ect

the reason drag slicks grip so well is they are VERY soft, i.e. if u pick up a normal commodore tyre and rim and thorw it at someones face u will fuck them up, if u did the same with a full sized slick u will knock them over but PROBABLY not injure them
They also run about 6-8 psi so the sidewalls "ripple" heavily when they launch, which allows them to hook up better
On launch, most group 1 drag cars probably have a contact patch of about 15-18 odd inches {approximated}, but by the end of the track it can be 12 inches of track,

Quote:

With slicks you do a burnout to warm them up - they need to be warm. The outside of the tyre actually liquifies! You can hear it sticking to the tarmac when a decent drag car reverses after a skid.. It even leaves tracks of rubber!

most of the reason they stick to the tarmac on reverse is because of a traction compound just called VHT {has a more technical name}, they spray this on the WHOLE track to help accomodate traction.
If u r at a street meet they probably wont put it down {not emuff power out of most of the cars to neccetate it}, but some times at street meets a very quick car comes out and tries to run and the run just goes to shit caus he's slipping all over the joint {thats why tony khoury's old probe hit the wall, 1600hp on an un-prepped track Confused

}

any car leave tracks of rubber

here is what i mean by tyrewall distortion

http://www.nhra.com/2004/gallery/tf/Larry_Dixon.jpg

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