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Discussion Starter #1
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.
Mat
 

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You don't say what you have for preload on the cal-tracs. ?
Cal-track advises using the upper hole up until 600 hp.
90/10 shocks will work better than 70/30.
You need at least 5" of frontend travel for cal-tracs to work properly.
Most use soft springs to get the frontend to rise, but I have big block springs on the front of my mustang and it rises ok. Soft springs would be better.
If it were me I would not let the tires hook coming out of the water box, hard on parts. I will pm you a cal-trac adjustment chart.
 

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Discussion Starter #3 (Edited)
Thanks, for the great info. We set the preload with me in the drivers seat to about 1/16th of an inch of play, befor it started to lift the rear of the car. I'll check again since we cut the coils but i believe i have enougb front travel.
Im going to set the bar in the top hole and start over, next track day is in two weeks, but i will post results. I tried getting video shot but wasnt that successful. The tires were definetly wrinkling and hooking initually than spinning.
The front seems to lift a bit, but doesnt stay up.
Thanks again
Mat
 

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Try to get the launch on video, you cannot tell what's going on from the drivers seat. Even someone watching from outside cannot see what's going on any where near as well as a camera that you can slow down and watch frame by frame. I would start in the upper hole, with rear shocks set between 5 and 7.
We have a bunch of cars that do real well with 1/2 turn of preload, all in the top hole, running from 12's to 10's, but all cars are going to be different. The video is the most important to be able to tell what's going on. Good luck and keep us posted.
 

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Discussion Starter #6
Thanks, i think the track wasnt perfect. But i will definely try the upper hole and go through the set up chart.
I was letting the tires hook as i came out of the box to make sure they were dry, but id like parts to last so i will try ending the burnout just before they would hook.

Thanks again
mat
 

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it looks like i have my calvert suspension set up to the softest hit possible. however, it hooked up my previous 466 motor with a 10.5 tire and up to a 4400rpm launch. i don't have a choice but to use lower hole cuz of my subframe connectors.

with the new 521 i haven't tested it yet and i'm hoping to this friday. WHAT EXACTLY DO THEY MEAN BY "HIT"?

i am wondering if i need a little harder hit with the new motor having alot more power and torque, but i'll lower my launch rpm to the 3000-3200rpm range now.
 

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HIT means how hard it hits the tires.
If you have a gap between the Cal trac pivot bolt and the spring, you'll get more "hit" on the launch than you will if you have the pivot bolt touching the spring already.
 

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HIT means how hard it hits the tires.
If you have a gap between the Cal trac pivot bolt and the spring, you'll get more "hit" on the launch than you will if you have the pivot bolt touching the spring already.
This may be your case but, not according to the posted chart.
 
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