Hoosier r80 r100 set up
11-07-2009, 09:13 AM
#2
Burning Brakes
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Yes. I ran a set of stickers at the 10/10ths event at VIR. It takes a couple of laps to get heat into them but they are real sticky after that and seem to last the full 25 minute sessions. I've run a total of 4 days on them so far and plenty of life left for DE's.
11-07-2009, 10:21 AM
#3
I need to buy a new set of track tires for HPDE use before Spring. Has anyone done a pro/con on the R80/R100 vs. A6/R6? I'm not clear on what the differences are (I understand the differences between A6 and R6).
11-07-2009, 10:38 AM
#4
Melting Slicks
The R80/100 are full racing slicks, not "DOT" spec race tires such as the A6 and R6. Not sure what class of racing they are designed for. I was trying to buy some A6's for hpde but they were not available in my sizes so they offered to send me the R100's instead. I just tried them at an open track day at Thunderhill and they were great. According to my track data my lateral G's were about equal to a new set of R6's, but the track conditions were not ideal for grip. They seem to last longer both with grip and treadware. I increased my front camber a bit with these slicks. I've never tried A6's before so can't compare to those.
Last edited by redtopz; 11-07-2009 at 11:05 AM.
11-07-2009, 11:45 AM
#5
Le Mans Master
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the numbers represent the rubber compound. i believe 1 is softest and 100 is hardest.can anyone confirm this
fyi race slicks will always be better than dot slicks, dot slicks have a steel belt
11-07-2009, 11:49 AM
#6
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r80 is the soft r100 is the harder compound. Porsche gt3 guys use the r80 up front and the r100 in the rear.
11-07-2009, 12:20 PM
#7
Melting Slicks
There are only 2 compounds:
https://www.hoosiertire.com/gt.htm
I am running 305/645 R100 scrubs on a square setup, so I can't comment on how much better they are when fresh but they wear like iron(I am guessing at least 3 track days or 12 sessions with rotation and tire flippping,) they are consistent, no dramatic dropoff in grip and are more camber tolerant than other slicks(Dunlops need mega camber or the outside edges go fast) I am running the max camber I can put into mine which is -3 on one wheel and -2 1/2 on the other and the outside edges are fine. I think the cords are not as close to the corner surfaces on the Hoosiers as they are on other slicks(or not.)
https://www.hoosiertire.com/gt.htm
I am running 305/645 R100 scrubs on a square setup, so I can't comment on how much better they are when fresh but they wear like iron(I am guessing at least 3 track days or 12 sessions with rotation and tire flippping,) they are consistent, no dramatic dropoff in grip and are more camber tolerant than other slicks(Dunlops need mega camber or the outside edges go fast) I am running the max camber I can put into mine which is -3 on one wheel and -2 1/2 on the other and the outside edges are fine. I think the cords are not as close to the corner surfaces on the Hoosiers as they are on other slicks(or not.)
11-07-2009, 05:37 PM
#8
So if you're not running competitely and don't have to worry about class restrictions why would you go with an R6 or A6?
11-07-2009, 07:19 PM
#9
Race Director
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W. Detroit Events Coordinator
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I have only run one weekend but have yet to see any drop off.
These Hoosiers were modeled after the Michelin's and the R 80 compound is based off the A6 compound except that it's supposed to last longer.
These were mainly designed for Porshes that need more front grip with the smaller tire so the R80 is for the front and the R100 for the Rear, for a Corvette I'm not sure why you would want a harder rear tire.
Aaron Pfadt ran 80-s upfront and 100s in the rear at Nationals he might have some better insight.
11-07-2009, 10:46 PM
#11
Instructor
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11-07-2009, 11:15 PM
#12
Melting Slicks
The 345/35-18 has an overall diameter of 26.8" and a section width of 13.9" , the 315/690-18 R100 has an overall diameter of 27.3" and a section width of 13.5" and that is kinda close.
11-08-2009, 05:44 PM
#14
Burning Brakes
http://www.hoosiertire.com/gt.htm
This one has more options
They offer 335/18 which I assume (NARRA) means North American Road Racing Association
http://www.hoosiertire.com/specrr.htm
I gotta get me some of these badboys
Last edited by 2002rich; 11-08-2009 at 05:56 PM.
