Michelin Pilot Sport Cup
11-25-03, 09:59 PM
#26
Well, DAMN!
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Cossie, your info was informative for me, thanks. Just to give you an idea of what our closest "competitor" is using out there during classes, 944T may see 225/40-18 (f) & 265/35-18 with hot pressures between 35-38 (f) and 26-30 (r) so your hot pressures look to be in line with what we rec. I'm curious if you measure your tire temps across the tread after, say 5 laps?
Ptrhahn, the SCs are grippy tires. The biggest issue for most racers new to the tires is improper inflation pressures (car specific), hot temps (160-220 deg across tread), camber issues (1.5-3 degrees 4 max) as well as not allowing at least 5-7 "heat cycles" (any type of 15-20 min track session). To be honest, a "new" (read heat cycled) SC tire is not as grippy as a "new" hoosier. They were about 1.3 sec slower around Elkart Lake than the Hoosiers for the first 3-5 laps and 6.5 sec is a lot to make up over a 20 minute session so that tends to be the reason why many go for the hoosiers (+ they're a bit cheaper). Our test drivers in S.Carolina using the correct inflation/ camber/ spring shock data found the tire to be only .5 sec slower over the same period of time. Where we excel is in consistency and durability. Of course this is completely dependant on how hard you are on tires, you have to replace the hoosiers or Khums 2-3 times a season while our tire can run a whole season. So if you're the type that wants to get out on the track and just have fun and equate value to long tread life then this is the tire for you. If you're looking for the out and out win during a 20 min race, the other tire would be your best bet. Just expect to pay more over a season. Some don't have an issue with that. Also SCs come with the tread depth of 6/32nds. A shaved tire (3.5/32nds) will see .05-.06 reduction in time on a typical 35-38 sec autocross course!
2. The KDs are some of the most driver-friendly tires, period! We did quite a few arrive and drive events throughout the U.S. using the 350z as the test car. We had BFG KDs against Bridgestone SO3s PPs. The tires were close. Where the BFGs made a difference was during the slalom section on the autocross course. After doing a right-left-right in a wide 90 deg right you could feel the KDs settle down quicker leading to a bit more confidence trail-braking into the right-hander. I'm not sure about tire longevity between the two. I don't want you to take my word for it. Next year we will be expanding this event so that you can formulate your own opinion. Plus I don't want to make this an infomercial! With regards to the KD and "R" tires, they are as close as you can get to an "R" compound and to add, there MAY BE some cool changes in the pipeline!
With regards to the question on 19's, I don't have an answer to that as I'm not a qualified engineer. One reason could be that a larger dia wheel does add more contact patch (front to rear) than an 18" or 17". I can find out an answer-next week! TURKEY TIME! I'm off until Mon.
Ptrhahn, the SCs are grippy tires. The biggest issue for most racers new to the tires is improper inflation pressures (car specific), hot temps (160-220 deg across tread), camber issues (1.5-3 degrees 4 max) as well as not allowing at least 5-7 "heat cycles" (any type of 15-20 min track session). To be honest, a "new" (read heat cycled) SC tire is not as grippy as a "new" hoosier. They were about 1.3 sec slower around Elkart Lake than the Hoosiers for the first 3-5 laps and 6.5 sec is a lot to make up over a 20 minute session so that tends to be the reason why many go for the hoosiers (+ they're a bit cheaper). Our test drivers in S.Carolina using the correct inflation/ camber/ spring shock data found the tire to be only .5 sec slower over the same period of time. Where we excel is in consistency and durability. Of course this is completely dependant on how hard you are on tires, you have to replace the hoosiers or Khums 2-3 times a season while our tire can run a whole season. So if you're the type that wants to get out on the track and just have fun and equate value to long tread life then this is the tire for you. If you're looking for the out and out win during a 20 min race, the other tire would be your best bet. Just expect to pay more over a season. Some don't have an issue with that. Also SCs come with the tread depth of 6/32nds. A shaved tire (3.5/32nds) will see .05-.06 reduction in time on a typical 35-38 sec autocross course!
2. The KDs are some of the most driver-friendly tires, period! We did quite a few arrive and drive events throughout the U.S. using the 350z as the test car. We had BFG KDs against Bridgestone SO3s PPs. The tires were close. Where the BFGs made a difference was during the slalom section on the autocross course. After doing a right-left-right in a wide 90 deg right you could feel the KDs settle down quicker leading to a bit more confidence trail-braking into the right-hander. I'm not sure about tire longevity between the two. I don't want you to take my word for it. Next year we will be expanding this event so that you can formulate your own opinion. Plus I don't want to make this an infomercial! With regards to the KD and "R" tires, they are as close as you can get to an "R" compound and to add, there MAY BE some cool changes in the pipeline!
With regards to the question on 19's, I don't have an answer to that as I'm not a qualified engineer. One reason could be that a larger dia wheel does add more contact patch (front to rear) than an 18" or 17". I can find out an answer-next week! TURKEY TIME! I'm off until Mon.
Last edited by BFGRX7; 11-25-03 at 10:11 PM.
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