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Old 11-28-2007, 04:06 AM   #1
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Default How to tell when rubber tyres are gone??

if a car is running on ashphelt with a good setup and brand new rubber tyres and seems like the pefect car to drive etc...

& after a fair few race meets and the setup has not been changed, what would the car do as the tyres are worn out ,

1. would it push wide at corners?

2. would it be loose and spin out at corners?



i am mainly interested in what would happen at the corners.
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Old 11-28-2007, 04:23 AM   #2
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You simply wont be able to get the tyres to turn the car in well, the tyres will scrub up and blister if they are too soft and the walls of the tyre will fold and become weaker.

But that all happens depending on compound and track temperature and usage.
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Old 11-28-2007, 04:30 AM   #3
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At almost every track that I've used old tyres on my car would oversteer.
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Old 11-28-2007, 04:35 AM   #4
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When the laptimes get slower - the tyres are gone. Scarily I've run tyres through to the insert and still kept the laptimes pretty close to my best!

Could be under/oversteer/neutral handling still. It probably depends a lot on your driving style and the car setup.

Personally speaking I usually lose steering if my tyres are on the way out.
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Old 11-28-2007, 04:37 AM   #5
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i noticed that my car is pushing wide at corner entry (i race stock class too by the way)

but i wanted to see if i was just tripping and hear what has happened to other people.


i run sorex 36r so i am almost certain that they are not over heating (they seem to still look good even after heaps of race meets.
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Old 11-28-2007, 04:46 AM   #6
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Quote:
Originally Posted by LOSI123 View Post
i noticed that my car is pushing wide at corner entry (i race stock class too by the way)
And your laptimes?
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Old 11-28-2007, 04:52 AM   #7
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my clubs website is rarely updated, so i cant tell, but im prety sure that they are slower,
when i went to check the print outs on the board some one else had stole them, lol, as the rain was coming and the meet got cancelled half way threw.
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Old 11-28-2007, 05:17 AM   #8
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If the laptimes are slower then the tyres are going. You can maybe adjust your setup to get the balance back but you will still have less grip to work with.
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Old 11-28-2007, 06:19 AM   #9
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I have noticed my findings above on a medium grip track, but it depends widely on the track grip, state/grip of the tyres to start with and car setup.

It may well be that you thought your laptimes were good to start with, but then tailed off or then you realised they were not good anyway.

Maybe step up to sorex 28s and see if things get any better? its all about the tyre wear Vs grip battle....
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Old 11-28-2007, 11:15 AM   #10
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if you've used them more than one raceday on asphalt, odds are the performance has dropped off. you can tell by lap times dropping off and being more difficult to turn consistent laps. depending on setup, bad tires can make a neutral car either push or oversteer. for me, it usually causes the car to push (more).
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Old 11-28-2007, 02:44 PM   #11
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thanks for all the input, i have ran the set im using now for about 6 or 7 race meets.


also the 36r is recomended at my track as ambient air temps are around 30 Celcius and track temps can get to 50 celcius


my car feels like it is definatly pushing, its a battle to get it to turn into the corner.

time for a new set i think...
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Old 11-28-2007, 05:50 PM   #12
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You could probably play with setup and get another meet or two out of them.
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Old 11-28-2007, 07:23 PM   #13
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Not at our track we used VHT, So old tires is perfect. using new tires sometimes hurt your lap times because of too much grip.... So I run the crap out of my tires till I can see the tread.....

Last race at my club everybody run new tires I stick with my old Sorex 36, Results is I was about 1 sec faster than everybody I TQ and 1 lap ahead.
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