Hoosier rubber compounds
#1
Melting Slicks
Thread Starter
Hoosier rubber compounds
How do you guys rate/compare the A6 with the slick compounds R80 and R100? How about life? Thanks for any input.
#2
Burning Brakes
#3
Safety Car
I bought like 12 scrub R80s for $500 back in the fall for HPDEs. I have 23 sessions on the first set so far. 1/2 of the sessions at VIR, 1/4 at Rd Atl and 1/4 at Charlotte/Daytona. Not corded yet and honestly not even looking like they need to be flipped. I don't push my car 10/10s, but the R888 scrubs I had barely got 8 sessions and I paid $200 plus for 4 of them.
Here is a typical 1 lap vid at VIR that shows about how hard I push them:
HTH
Here is a typical 1 lap vid at VIR that shows about how hard I push them:
HTH
#5
Team Owner
Member Since: Sep 2003
Location: Raleigh / Rolesville NC
Posts: 43,084
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My understanding is
A6s are the softest. then R6s
the R80s are softer then the R100s
The construction of the R80s and R100s are very different from the A6s and R6s
so not always apples to apples.
the Old VRLs were the same as the R6 rubber compound but a stiffer sidewall
A6s are the softest. then R6s
the R80s are softer then the R100s
The construction of the R80s and R100s are very different from the A6s and R6s
so not always apples to apples.
the Old VRLs were the same as the R6 rubber compound but a stiffer sidewall
#7
Melting Slicks
Thread Starter
I bought like 12 scrub R80s for $500 back in the fall for HPDEs. I have 23 sessions on the first set so far. 1/2 of the sessions at VIR, 1/4 at Rd Atl and 1/4 at Charlotte/Daytona. Not corded yet and honestly not even looking like they need to be flipped. I don't push my car 10/10s, but the R888 scrubs I had barely got 8 sessions and I paid $200 plus for 4 of them.
Here is a typical 1 lap vid at VIR that shows about how hard I push them:
HTH
Here is a typical 1 lap vid at VIR that shows about how hard I push them:
HTH
#9
Tech Contributor
#10
Burning Brakes
#11
Melting Slicks
The Conti GrandAm 285/645 is not the same as the R100. Different internal construction(the GrandAm was designed to sustain the loading on the banking at Daytona) I am not certain as to how the compound compares to the R100.
#15
Racer
Regarding the Conti's, what is the difference between the GT-O and the GT-R?
#16
Melting Slicks
I ran a set of R80 F/R100 R before (off a porsche race car) and was impressed with the level of grip, the lack of fading off like an A6, and how long the tires lasted from a physical wear standpoint.
#17
Tech Contributor
My name is Ed, just like yours!
I used to immediately post what I knew to be true. I found that, facts aside, folks would argue with me.
Not long ago, I took the time to revise and post here a pretty lengthy technical discussion on racing wheels and tires. It contains knowledge that we have gained over the years, not from theory, not from books, and certainly NOT from the world-wide-web; but from running real cars on real tracks, representing hours upon hours of testing.
Tom is usually "right-on" with his information, so somehow he has gotten something skewed, probably by someone else "speaking" authoritatively on a subject about which they know very little. I am just curious of the source.
Also, I am certain that Everett knows very well the mechanical grip ranking of all the Hoosiers in question, so there is no need for me to correct for his benefit. I believe he is more looking for first-hand experience on tire "behavior", consistancy, and wear characteristics.
For those interested, there was another thread some time ago on which I discussed the use of a durometer. That would be good to search for too.
Ed
#18
Tech Contributor
Slicks are in a category of their own! And, if one is impressed with the current radials, especially the 80 and 100 compounds, one should try a nice set of bias-ply - maybe a 45 compound - whole other OTHER world.
Ed
Last edited by RacePro Engineering; 03-05-2012 at 11:40 PM. Reason: Bias ply
#20
Tech Contributor
?? Should be .075 ??
And, in case there is any (ANY) doubt whatsoever about the inherent grip differences between a good DOT radial, and a good slick, one has only to look at this NASA "Equalization Factor" in added weight.
Thanks for reminding me, Travis.
Ed