| Author | Message | ||
| Rob Lay (Rob328gts)
Board Administrator Username: Rob328gts Post Number: 6150 Registered: 12-2000 |
It's more like 2-3 seconds on most tracks, but I agree, the driver is 10-20 seconds. I'll beat any inexperienced driver in any car with my little 135 HP Rx7. | ||
| Martin - Cavallino Motors (Miami348ts)
Senior Member Username: Miami348ts Post Number: 5926 Registered: 5-2001 |
If its only a second.....That means 10 seconds less for skills (or lack thereof) and another second for the tires till they burn up  I have also a set of Pirellis but took them off the rim to put rain tires on. Now I just bought another set of rains on CH rims so the Pirellis will go back on the other rims. | ||
| Rob Lay (Rob328gts)
Board Administrator Username: Rob328gts Post Number: 6144 Registered: 12-2000 |
Running SCCA you have to use the DOT R compond tires like Hoosier, Kuhmo, or Toyo. As Jon says, you'll run more than a second a lap slower and the wear isn't any better. | ||
| Jon P. Kofod (95f355c)
Member Username: 95f355c Post Number: 961 Registered: 8-2001 |
Martin, I have never run Hoosiers on the 355 but it's a far inferior tire compared to a D3 Pirelli slick or a Dunlop slick. I know some people who race 355 C's on Hoosiers in SCCA but none were happy with them. If your talking about the Hoosier R rated tire you get at Tirerack I seem to recall that tire pressures (cold) are set according to some weight class they use. I seem to recall that cars weighing between 3000-3200 pounds are supposed to start with cold temps of 30-32 pounds. I have run the Grand Am Spec Hoosiers on my BMW club racer (a bit harder compound) and they are fine for a BMW but I wouldn't run them on the Challenge car. Regards, Jon | ||
| Martin - Cavallino Motors (Miami348ts)
Senior Member Username: Miami348ts Post Number: 5906 Registered: 5-2001 |
Do you guys think by chnaging to Hoosier the pressure will be different? | ||
| Jon P. Kofod (95f355c)
Member Username: 95f355c Post Number: 953 Registered: 8-2001 |
Martin, According to my "official" Pirelli Challenge documents recommended pressures are as follows: Cold: 24.7 front 23.2 rear Hot: 33.356 front 34.807 rear However I don't agree with those figures and neither does Tony at Algar Racing nor Glen Marquis at Washington Motorsports both of whom ran their respective dealerships Challenge teams. What works best for me is the following: Hot: 31-31.5 front 32-33.5 rear A lot depends on how the car is set up and your personal driving style. Matt Karson told me this weekend he runs around 28-29 hot which is way below what Pirelli recommends but he holds the track record at the Glen so it works for him. I think that Pirelli was trying to set up a baseline with a very neutral car for the average driver/racer. Most people new to racing prefer a car that pushed a bit as opposed to a car that is loose. The fast guys mostly ran the car loose with corner entry oversteer to get rid of some of the understeer. Also your temps are going to be highly dependent on the tempeture outside which in Florida is drastically different than up state New York. Might want to compare notes with Rob since he runs in similar weather. Regards, Jon P. Kofod 1995 F355 Challenge #23 | ||
| Rob Lay (Rob328gts)
Board Administrator Username: Rob328gts Post Number: 6132 Registered: 12-2000 |
With the Pirellis I was told 22-24 cold. | ||
| Martin - Cavallino Motors (Miami348ts)
Senior Member Username: Miami348ts Post Number: 5902 Registered: 5-2001 |
What tire pressure do you start out with (cold) on slicks mounted on 18inch Speedline Challenge wheels? Where is the pressure when hot (off the course) |