Tire Choices with UTQG of 140 or higher
08-30-2002, 03:15 PM
#1
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Tire Choices with UTQG of 140 or higher
Next year's <a href="http://www.opentrackchallenge.com/main.htm" target="_blank">Open Track Challenge</a> has raised the minimum treadwear rating for the Touring Groups' tires from 60 to 140, which means Yokohama A032R's are no longer legal. The new minumum is a treadware rating of 140.
What's the best dry track tire in this category?
Here are some candidates:
Bridgestone Potenza S-02 (140, but NLA)
Bridgestone Potenza RE71 (140)
Bridgestone Expedia S01 A/M (140)
Pirelli/PZero System Asimmetrico (140)
Michelin Pilot SX MXX3 (140)
Yokohama AVS Sport (180)
Bridgestone Potenza S02 Pole Posiiton (180)
BFGoodrich g-Force T/A KD (200)
Bridgestone Potenza S-03 Pole Position (220)
Kumho Ecsta MX (220)
Michelin Pilot Sport (not the 'Cup') (220)
Goodyear Eagle F1 Supercar (220)
What's the best dry track tire in this category?
Here are some candidates:
Bridgestone Potenza S-02 (140, but NLA)
Bridgestone Potenza RE71 (140)
Bridgestone Expedia S01 A/M (140)
Pirelli/PZero System Asimmetrico (140)
Michelin Pilot SX MXX3 (140)
Yokohama AVS Sport (180)
Bridgestone Potenza S02 Pole Posiiton (180)
BFGoodrich g-Force T/A KD (200)
Bridgestone Potenza S-03 Pole Position (220)
Kumho Ecsta MX (220)
Michelin Pilot Sport (not the 'Cup') (220)
Goodyear Eagle F1 Supercar (220)
09-03-2002, 10:37 AM
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Hi Jack,
I saw you posted this question to the list and got some interesting responses (I am in digest mode so thought I might as well reply here). I know others have suggested the Goodyears and BFGs together with the Toyo T1S (not on your original list). I think you should add the MXX3 Michelin and the P-zeros to the list of possibles. The MXX3 is reputed to be the quickest wearing and highest grip OE tyre used by Porsche and when shaved down looks like a grooved slick and works very well. My experience with these is however limited. I have had experience with a 3.8 RSR race car that had to run non-R tyres for some sprint races once and the best we could find then was the Pzero. They worked very well.
As you may have guessed, shaving is a must to get rid of the tall squirmy tread blocks and to stop/minimise heat build up. Tread patterns like the Pzero and the MXX3 work well when shaved because they end up like lightly grooved slicks. SO2 type V patterns don't work so well IMO.
Another data point. The TIS in UK tests done by Subaru drivers (lots of discussion on Scoobynet) comes out as no better than SO2s. A shaved SO2 is however an option to think about as it has a grippier compound underneath the top compound.
The Falken Azenis RS also looks worth a look - it has big fat outer tread blocks that ought to work very well once shaved. These aren't available in the UK but folks using Falkens in Australia like them.
Other points:
Tyre rejuvenating fluids definitely help.
A durometer is a way to test relative hardness of different tyres.
Sorry I can't steer you to an absolute winner, but hope the info helps.
Richard
I saw you posted this question to the list and got some interesting responses (I am in digest mode so thought I might as well reply here). I know others have suggested the Goodyears and BFGs together with the Toyo T1S (not on your original list). I think you should add the MXX3 Michelin and the P-zeros to the list of possibles. The MXX3 is reputed to be the quickest wearing and highest grip OE tyre used by Porsche and when shaved down looks like a grooved slick and works very well. My experience with these is however limited. I have had experience with a 3.8 RSR race car that had to run non-R tyres for some sprint races once and the best we could find then was the Pzero. They worked very well.
As you may have guessed, shaving is a must to get rid of the tall squirmy tread blocks and to stop/minimise heat build up. Tread patterns like the Pzero and the MXX3 work well when shaved because they end up like lightly grooved slicks. SO2 type V patterns don't work so well IMO.
Another data point. The TIS in UK tests done by Subaru drivers (lots of discussion on Scoobynet) comes out as no better than SO2s. A shaved SO2 is however an option to think about as it has a grippier compound underneath the top compound.
The Falken Azenis RS also looks worth a look - it has big fat outer tread blocks that ought to work very well once shaved. These aren't available in the UK but folks using Falkens in Australia like them.
Other points:
Tyre rejuvenating fluids definitely help.
A durometer is a way to test relative hardness of different tyres.
Sorry I can't steer you to an absolute winner, but hope the info helps.
Richard
09-05-2002, 12:42 PM
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Jack -- I have used the Yoko AVS Intermediates on my 71 911 for 2 years now at numerous DE events. These tires really stick for a street tire. Also - Tire Rack currently has them on clearance -- my size 205/60/15 are only $47 each!
