As some of you know, I had the privilege of driving the SLC for RCR at this years Run and Gun. I wanted to share with you how I had the car set up for the track and maybe provide you with a baseline for the initial chassis set up. Here it goes.........
The car was an LS7/Ricardo equipped car with a used set of Hoosier R6's. We had a new set of A6's but the weather was such that I never used them.
The car weighed in at 2478 with some fuel. I didn't know how much gas was in the car but I had to work with what I had.
Front left = 616 Front right = 583
front = 1199 (48.4%)
Back left = 634 back right = 645
back = 1279 (51.6%)
Cross weights are 49.1% x 50.9%
I was pretty happy with the balance. I am sure if I played with it for a longer period I could get it closer but I was out of time. I will say that the chassis is really stiff. Just an 1/8 of a turn on the spring can make a significant change in the corner weights.
The camber was set to -1 in the front and -.75 in the rear. One full turn on both upper hiems will yield about .25 degrees. I ran 1/16 of toe out in the front and 1/16 toe in in the rear. The alignment was so easy to do on this car relative to the GT40. I checked the caster and if you set all the control arms in the center of their mounts you will be at about 4.5 deg.. I choose to set it up one washer off center to create a caster setting of 5.5. I didn't want to take the chance of the front end being to "light" in the steering at high speed.
I set the shocks from the full out position. I know I am supposed to set the adjustments from the in position and measure the clicks out but this car responds better to less valving so it was easier to count the turns in. I didn't get to run hard after Wednesday due to the rain but i like the car with 5 clicks in all around. This made the car a little tight in the exits but I was still getting used to it. We repeatedly check the tire temps and they were with 5 degrees across the tires with a starting air pressure of 21 pounds and a hot temp of 27 to 28 degrees. It was pretty cool, in the 50's that day.
Here is the stance of the car at just over 150mph on the straight. It was crazy how stable the car was. I wasn't even over 6000rpms in 4th!
This is hard on the brakes coming into a tight turn onto the NASCAR oval.
This is a fast chicane. The car is rail flat and really feels smooth and solid as the weight was transferred left to right.
When I checked the data logger the lateral g load max was 1.77:stunned: And we were just doing a shack down for the race the next day. I had never driven this car before this test and tune session and, without running hard, I turned a 1.09 lap on the track. The fastest time I ever ran in the GT40 was 1.07.98 and consistently can in the mid 1.08's. This can can make a bad driver feel good. At least it did for me! At the end of the test and tune we had the fastest unofficial time. I can't say how we would have done running all out but I think we would have fared very well.
The car was an LS7/Ricardo equipped car with a used set of Hoosier R6's. We had a new set of A6's but the weather was such that I never used them.
The car weighed in at 2478 with some fuel. I didn't know how much gas was in the car but I had to work with what I had.
Front left = 616 Front right = 583
front = 1199 (48.4%)
Back left = 634 back right = 645
back = 1279 (51.6%)
Cross weights are 49.1% x 50.9%
I was pretty happy with the balance. I am sure if I played with it for a longer period I could get it closer but I was out of time. I will say that the chassis is really stiff. Just an 1/8 of a turn on the spring can make a significant change in the corner weights.
The camber was set to -1 in the front and -.75 in the rear. One full turn on both upper hiems will yield about .25 degrees. I ran 1/16 of toe out in the front and 1/16 toe in in the rear. The alignment was so easy to do on this car relative to the GT40. I checked the caster and if you set all the control arms in the center of their mounts you will be at about 4.5 deg.. I choose to set it up one washer off center to create a caster setting of 5.5. I didn't want to take the chance of the front end being to "light" in the steering at high speed.
I set the shocks from the full out position. I know I am supposed to set the adjustments from the in position and measure the clicks out but this car responds better to less valving so it was easier to count the turns in. I didn't get to run hard after Wednesday due to the rain but i like the car with 5 clicks in all around. This made the car a little tight in the exits but I was still getting used to it. We repeatedly check the tire temps and they were with 5 degrees across the tires with a starting air pressure of 21 pounds and a hot temp of 27 to 28 degrees. It was pretty cool, in the 50's that day.
Here is the stance of the car at just over 150mph on the straight. It was crazy how stable the car was. I wasn't even over 6000rpms in 4th!
This is hard on the brakes coming into a tight turn onto the NASCAR oval.
This is a fast chicane. The car is rail flat and really feels smooth and solid as the weight was transferred left to right.
When I checked the data logger the lateral g load max was 1.77:stunned: And we were just doing a shack down for the race the next day. I had never driven this car before this test and tune session and, without running hard, I turned a 1.09 lap on the track. The fastest time I ever ran in the GT40 was 1.07.98 and consistently can in the mid 1.08's. This can can make a bad driver feel good. At least it did for me! At the end of the test and tune we had the fastest unofficial time. I can't say how we would have done running all out but I think we would have fared very well.
