Cal Track and traction help needed
Well our local track finally opened so i could try out my new rear set-up. Wasn't as ground breaking as i was hoping). At the end of last year with my (460-480hp) 460 and 3.50's i was running 12.52's at 106mph with 1.72'ish 60ft's. This was on air shocks, worn out old leafs (with one leaf in the pack actually broken and some hand me down 28x11.5x15 et streets, ballooning on my old 7" steelies.
This winter i added calvert springs, cal tracs, calvert rear drag shocks, 4.11 gears with a real locker, aluminium 10" welds with brand new 28x11.5x15 et streets, and 30/70 comp shocks with a coil cut from front springs. The best i ran tonight was a 12.63 @104 with a 1.77 60. Tires spinning off the line, every time. I ran about 12.6-12.7 runs in the 104-107mph rang with 1.77-1.98 60'. The rest of my dozen runs were in the low 13's. Never hooked hard once, tires crinkled but always spun for the first bit of the launch. It was a cool night and the track just opened, not a lot of rubber layed down yet, but i just couldnt hook the tires. I started pressure at 18.5psi (last years favorite) and dropped to 12psi. I started the shocks at 4 and went down to 1, with no great success, granted the dropping temp and rissing dew point didnt help.
just wondering how i should set up my caltracs? I set them with me in the drivers seat for weight. Not sure if the rear end is too stiff now, or the track was just to cold. I did my best to heat the tires in the water box and always pulled out with that re-assuring chirp as the tires, dried and hooked. My best run was my first at 6pm when the sun was still hot on the track. And obviously the 4.11's are harder to hook than the old 3.50's were. But I've seen Ken hook with the same gears, tires and rear set-up- Hard.
I ordered the 1'+ ride height and have the cal tracks in the lower hole up front.
My stiff front springs might do better with some 90/10's, but last year they were fine with regular old gas shocks
On a side note, the 4.11's not only helped the drivability of the car with the 4000 stall, they also got ride of a ton of converter slipage. Last year with 3.50's I was going through the traps at 107mph at 5200 on my 27.5" tall tires (12.6% slippage). With the 4.11's and same converter and tires i am now going through the traps at 107 at 5700rpm.(6.4% converter slippage). So they are running well together, although I think my 4000 stall and 4.11's are a little radical for my smallish cammed (219/227 voodoo) 10.4:1 D3 headed 460.