Infineon carousel > LS1 - F-Body Road Racing and Autocross Forums

The Good news:
Been waiting to get a chance to edit a LOT of footage from my last day at Infineon Raceway a few weeks back. AWESOME DAY. My CAR was putting up some serious lap time (IMO) all things considered. With lots of Blaine Fab love on the car, it was kicking ass and taking Porsches names. It seemed to understeer and its response to feedback was sort of inconsistent I felt.....but somehow I was ripping off 1:56s, in my FULL WEIGHT+ street driven car.....with a passenger, and a bit of traffic on most laps. I think the understeer might have been due to the fact that I was pushing the car a lot harder than I was on my previous outing here....and its a pig.

The Ugly:

Hurt the motor coming around the carousel near the end of the day. My best friend/mechanic was driving and the car lost oil pressure (25psi at idle) after coming around it. I noticed throughout the day that if I had the entry just right, and the car was biting real hard.....the pressure would dip for a split second at the end of the run-out.... and then shoot right back up. Guess the ol' LS1 got tired of that shit by the end of the day. It likely spun a/some rod bearings. It was knocking GOOD by the time we limped it back into the pits.

Anywho, here is a couple of teaser clips before we compile the full days edit:

Carousel-->double pass
http://www.youtube.com/watch?v=1bcqonLzyEg...;feature=relmfu

Camaro > GTR
http://www.youtube.com/watch?v=3d5CZW2mjUs&feature=plcp

ninetres View Member Profile	Jun 9 2012, 01:20 AM Post #1
Member Group: Advanced Members Posts: 119 Joined: 4-April 11 Member No.: 65,266	The Good news: Been waiting to get a chance to edit a LOT of footage from my last day at Infineon Raceway a few weeks back. AWESOME DAY. My CAR was putting up some serious lap time (IMO) all things considered. With lots of Blaine Fab love on the car, it was kicking ass and taking Porsches names. It seemed to understeer and its response to feedback was sort of inconsistent I felt.....but somehow I was ripping off 1:56s, in my FULL WEIGHT+ street driven car.....with a passenger, and a bit of traffic on most laps. I think the understeer might have been due to the fact that I was pushing the car a lot harder than I was on my previous outing here....and its a pig. The Ugly: Hurt the motor coming around the carousel near the end of the day. My best friend/mechanic was driving and the car lost oil pressure (25psi at idle) after coming around it. I noticed throughout the day that if I had the entry just right, and the car was biting real hard.....the pressure would dip for a split second at the end of the run-out.... and then shoot right back up. Guess the ol' LS1 got tired of that shit by the end of the day. It likely spun a/some rod bearings. It was knocking GOOD by the time we limped it back into the pits. Anywho, here is a couple of teaser clips before we compile the full days edit: Carousel-->double pass http://www.youtube.com/watch?v=1bcqonLzyEg...;feature=relmfu Camaro > GTR http://www.youtube.com/watch?v=3d5CZW2mjUs&feature=plcp

BPWilliams View Member Profile	Jun 12 2012, 01:08 PM Post #2
Advanced Member Group: Advanced Members Posts: 285 Joined: 29-June 09 Member No.: 5,458	The thing is that if you do the math your car does not need a 315 tire. I sat down with Larry Pond (raced with Bob Bondurant and Carol Shelby) and we did the math, based on the weight of the cars, contact patch, and the speeds we run in Arizona a 255 tire would keep the proper heat in the tire. At 275 I can keep about 185 degrees which is on the low side of the tire rating, 315 would be even cooler. ASA Truck series runs a 10.5 inch tire on a full tube frame chasis so that is something to think about. So the long and short of it is that the size of your tire should be based on the proper heat range to excite the tire compound, not necessarily bigger is better...