dfhotlm33c
08-05-2013, 09:47 AM
The scenario:
Heat race:
LR: 90/11 spec 1200 tire, 87"
RR: 92/11 C3000 1200 tire, 91" Wide as heck, like 16" section width, 6 blocks of tread across.
Car tight as all heck. Had to throw it in corner hard to even get it to rotate, and even then it was fighting me like crazy. Don't think I countersteered more than a few times, and that was because I forced it to snap loose with brake and throttle.
I took 1.5 rounds of wedge out (1.5 out of LR, 1.5 into RR, .75 into RF, .75 into LF), so went from 110 to about 80 pounds of bite. No other adjustments.
Feature:
LR 28.5/11 economy 1300 tire. 87 3/8". Same width as the tire from heat race.
RR 29/11 NRM 1325 grooved and siped 91 5/8" (So 4.25" stagger). Much narrower tire than heat race tire, by at least 2"
Car was pretty much dead on, even a hair loose off. Overall, waaaaay more driveable. The track had not changed much at all between heat and feature (Eriez speedway). Maybe just a touch slicker, but still plenty of bite left. All tires had only one race on them prior to this night. All had been scrubbed, cleaned and scuffed.
The question: Did I just learn my first real lesson about tires and construction? I can't imagine that 30 pounds of bite and .25" of stagger would make that much of a difference. It was literally night and day. Did the massive RR tire generate so much side bite that it was making me tight as heck during the heat? I have a new rib 1200 I can use for next week that is similar width to the feature tire from this week. Should I use that and expect similar handling?
Heat race:
LR: 90/11 spec 1200 tire, 87"
RR: 92/11 C3000 1200 tire, 91" Wide as heck, like 16" section width, 6 blocks of tread across.
Car tight as all heck. Had to throw it in corner hard to even get it to rotate, and even then it was fighting me like crazy. Don't think I countersteered more than a few times, and that was because I forced it to snap loose with brake and throttle.
I took 1.5 rounds of wedge out (1.5 out of LR, 1.5 into RR, .75 into RF, .75 into LF), so went from 110 to about 80 pounds of bite. No other adjustments.
Feature:
LR 28.5/11 economy 1300 tire. 87 3/8". Same width as the tire from heat race.
RR 29/11 NRM 1325 grooved and siped 91 5/8" (So 4.25" stagger). Much narrower tire than heat race tire, by at least 2"
Car was pretty much dead on, even a hair loose off. Overall, waaaaay more driveable. The track had not changed much at all between heat and feature (Eriez speedway). Maybe just a touch slicker, but still plenty of bite left. All tires had only one race on them prior to this night. All had been scrubbed, cleaned and scuffed.
The question: Did I just learn my first real lesson about tires and construction? I can't imagine that 30 pounds of bite and .25" of stagger would make that much of a difference. It was literally night and day. Did the massive RR tire generate so much side bite that it was making me tight as heck during the heat? I have a new rib 1200 I can use for next week that is similar width to the feature tire from this week. Should I use that and expect similar handling?