Hoosier Tire Temps - feedback wanted

[kbrew8991]

These were the tire temps I took from my last race - These were 20+ heat cycle R6s, 205/50/15 front, 225/45/15 rears. I tried to get into the pits as quick as possible but it was a long pit road before I could get to my helper so I'm sure the actual on track stuff is higher. The turn right before the pits was a long 180* high speed (85-90mph) right hander fwiw.

LF - out = 136, mid = 143, in = 145 (total spread 9)
RF - out = 130, mid = 140, in = 148 (total spread 18)
LR - out = 148, mid = 150, in = 156 (total spread 8)
RR - out = 135, mid = 145, in = 142 (total spread 10)

pressures were
LF - cold = 30, hot = 36
RF - cold = 30, hot = 35
LR - cold = 29, hot = 36
RR - cold = 29, hot = 35

corner weights (if it helps) total = 2594lbs on this weigh in (lightest was 2579)
LF - 569
RF - 573
LR - 771
RR - 681

(48.2% LF - RR cross weight)

Ambient - 94
Track Temp - 99

1.) am I running the right amount of camber or should look at more?? less??
2.) that RR appearing to be too high on the pressure is odd, any ideas why at the same pressure as the LR that it would be too high? This was at TWS going CW, so there were a few more rights than lefts
3.) little bit outside just tires, but I need to add 75lbs ballast - aim towards the RR as much as possible or...?

Appreciate the help - I won't have much time before NASA Nats to get these dialed in any closer so the more homework I can do to get it closer before the event starts is helpful

[philstireservice]

Ken.....didn't you get enough good info over at rr...

[kbrew8991]

I posted it in a few places to try and catch some unique views I might not otherwise get was all

[TailWagger]

Originally Posted by kbrew8991

These were the tire temps I took from my last race - These were 20+ heat cycle R6s, 205/50/15 front, 225/45/15 rears. I tried to get into the pits as quick as possible but it was a long pit road before I could get to my helper so I'm sure the actual on track stuff is higher. The turn right before the pits was a long 180* high speed (85-90mph) right hander fwiw.

LF - out = 136, mid = 143, in = 145 (total spread 9)
RF - out = 130, mid = 140, in = 148 (total spread 18)
LR - out = 148, mid = 150, in = 156 (total spread 8)
RR - out = 135, mid = 145, in = 142 (total spread 10)

pressures were
LF - cold = 30, hot = 36
RF - cold = 30, hot = 35
LR - cold = 29, hot = 36
RR - cold = 29, hot = 35

corner weights (if it helps) total = 2594lbs on this weigh in (lightest was 2579)
LF - 569
RF - 573
LR - 771
RR - 681

(48.2% LF - RR cross weight)

Ambient - 94
Track Temp - 99

1.) am I running the right amount of camber or should look at more?? less??
2.) that RR appearing to be too high on the pressure is odd, any ideas why at the same pressure as the LR that it would be too high? This was at TWS going CW, so there were a few more rights than lefts
3.) little bit outside just tires, but I need to add 75lbs ballast - aim towards the RR as much as possible or...?

Appreciate the help - I won't have much time before NASA Nats to get these dialed in any closer so the more homework I can do to get it closer before the event starts is helpful

Not sure I can help but for that level of ambient and track temp your readings still strike me as pretty low. Was this a probe or infrared? In any case, the numbers dont seem to point to anything conclusive to me... one feels compelled to question their accuracy. I agree there might be a suggestion that perhaps more neg camber might help, but the tightness of the left side numbers versus the right side is perhaps a little odd. The L side numbers look pretty good, the right look weird. Had you done an alignment recently? Or was the car ever smacked hard on the right side?

[kbrew8991]

probe type pyrometer

the turn leading to pit road was a long high speed (80-90mph) right hand 180* turn... that might be the L vs R difference right there

[TailWagger]

Originally Posted by kbrew8991

probe type pyrometer

the turn leading to pit road was a long high speed (80-90mph) right hand 180* turn... that might be the L vs R difference right there

Perhaps, but the spreads on the right seem odd. Given its a probe, if the tires were at optimal temp you'd be losing upwards of 40-50 degrees (on both sides) on the way into the pits, which doesnt seem possible. If it were me, I'd at least experiment with cold pressures on the lower side of recommended to see if I could build more heat (or run A6s or 710s perhaps). From Hoosiers web site:

"For best performance the expected temperature range will vary from track to track. Generally, optimum traction will be generated when the pit lane temps show 180-200 degrees for the R6 in Roadrace applications, and 140-150 degrees for the A6 in an Autocross application."

Vehicle size------------Recommended Hot Pressure--------------Cold Pressure
2200-2600 lbs.------------------- 35-38+ ------------------------------ 27-32

[RobAGD]

Hey just wondering has any one messed around with the r100's ?

We have a few guys using the R6 and R100 and our cars are on teh extreem edge of the envlope for these tires given our weight ( 4200 to 4600# )

Two of our guys have been in contact with Hoosie about tires and hot/cold pressures, it has been intresing to say the least.

-Robert

[kbrew8991]

710s get greasy way too easy, won't last a whole race
As are a possibility

from what rrax was telling me thats about the expected temp, they just don't get as hot when they're so heat-cycled out