FYI: Hoosier R6 tire measurements
08-20-2007, 11:17 AM
#1
Le Mans Master
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FYI: Hoosier R6 tire measurements
I recently bought a new set of Hoosiers in 345/35-18 and 295/30-18 and before I had them mounted I made a few measurements. The 345's had the following:
Max section width= 364mm
Max section height= 108mm
Weight= 29 lbs
Durometer=64
The front 295's had:
Max section width= 304mm
Max section height= 93mm
Weight= 24 lbs
Durometer=64
I ran them Thursday at NHIS, and I was very impressed. We started off in the morning (60 F)with a 29 PSI initial cold pressures, and after the RF went to 40 and the RR went to 38 (yes it was pushing in left handers) and the lefts around 36-37 psi after the first session. We went down one click (from 4 to 3) on the RF shock compression damping and reduced the RF pressure to about 32 static (but still very warm) and at 35-36 psi hot (I have the pressure sensors and Bartec tool) the car was fantastic. I was running -1.0-1.2 rear camber, 1.5 or so front and I could have used some more RF camber but it was close. Also, it was the first time out with some new Pfadt urethane bushings on all 4 corners (great product, more later in a different post) so I did not need 2.5 degrees static camber to get say 1.5 degrees under load like with the stock rubber bushings. I can now say the correct pressures in the R6 is different than the R3SO5, and is around 34-36 psi. As I get more time, I will try to refine the number tighter.
Max section width= 364mm
Max section height= 108mm
Weight= 29 lbs
Durometer=64
The front 295's had:
Max section width= 304mm
Max section height= 93mm
Weight= 24 lbs
Durometer=64
I ran them Thursday at NHIS, and I was very impressed. We started off in the morning (60 F)with a 29 PSI initial cold pressures, and after the RF went to 40 and the RR went to 38 (yes it was pushing in left handers) and the lefts around 36-37 psi after the first session. We went down one click (from 4 to 3) on the RF shock compression damping and reduced the RF pressure to about 32 static (but still very warm) and at 35-36 psi hot (I have the pressure sensors and Bartec tool) the car was fantastic. I was running -1.0-1.2 rear camber, 1.5 or so front and I could have used some more RF camber but it was close. Also, it was the first time out with some new Pfadt urethane bushings on all 4 corners (great product, more later in a different post) so I did not need 2.5 degrees static camber to get say 1.5 degrees under load like with the stock rubber bushings. I can now say the correct pressures in the R6 is different than the R3SO5, and is around 34-36 psi. As I get more time, I will try to refine the number tighter.
08-20-2007, 12:50 PM
#2
Le Mans Master
The R6 is a great tire. Best I've ever used, but they take a little longer than their predecessor to warm up. I have done 15 minutes sessions where they were just getting up to temp. If you are doing open track days though, they seem to last for a LONG time before they overheat. The pressures are definately much less than the R4
08-20-2007, 12:59 PM
#3
Melting Slicks
Member Since: Sep 2004
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I ran them Thursday at NHIS, and I was very impressed. We started off in the morning (60 F)with a 29 PSI initial cold pressures, and after the RF went to 40 and the RR went to 38 (yes it was pushing in left handers) and the lefts around 36-37 psi after the first session. We went down one click (from 4 to 3) on the RF shock compression damping and reduced the RF pressure to about 32 static (but still very warm) and at 35-36 psi hot (I have the pressure sensors and Bartec tool) the car was fantastic. I was running -1.0-1.2 rear camber, 1.5 or so front and I could have used some more RF camber but it was close. Also, it was the first time out with some new Pfadt urethane bushings on all 4 corners (great product, more later in a different post) so I did not need 2.5 degrees static camber to get say 1.5 degrees under load like with the stock rubber bushings. I can now say the correct pressures in the R6 is different than the R3SO5, and is around 34-36 psi. As I get more time, I will try to refine the number tighter.
I run them at 34 PSI front and 28 to 30 PSI rear. This seems to give me the best F-R balance. Most Vette drivers I have seen use at least 4 PSI differential F to R. You may want to experiment some more with your tire pressures.
Enjoy your R6s, the best track tires available today, bar none.
08-20-2007, 07:04 PM
#5
Team Owner
The R6 is a great tire. Best I've ever used, but they take a little longer than their predecessor to warm up. I have done 15 minutes sessions where they were just getting up to temp. If you are doing open track days though, they seem to last for a LONG time before they overheat. The pressures are definately much less than the R4
08-20-2007, 08:24 PM
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Melting Slicks
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