Quote:
Originally Posted by petevb
I believe the SC/RS and some other cars had that option, though I suspect strongly they were run reinforced as well.
We can run some quick numbers for an idea of the effect:
In a stock car the shocks probably transfer in the ballpark of 50 lbs of force peak over a bump to those pickup points by themselves, so that's probably close to what the unreinforced pickups were designed to see without reinforcement.
If you run stiff springs, you should really also run stiff shocks to control them; with anything like 31mm T bars or 400 lb springs, properly matched shocks will probably transfer more like 100 lbs of force over bump to those pickup points, so we're already over 2x the initial design.
Now add coil springs to that. Even if the coil springs themselves are only 200 lbs each to support half the car's weight, remember that you're taking half the corner weight of the car (which is 800+ lbs on a rear corner). So you're adding 400 lbs to that corner, or more like 700+ lbs when the suspension goes over a bump and compresses 1.5". Suddenly we're at 700 + 100 from the shocks = 800 lbs, or 16x design load.
Now I'm sure there is some margin in the original design, especially if the considered the shock bottoming out, but there probably isn't anything like a 16x factor of safety. Short answer- I'd personally really want to reinforce those points even if the coil-overs are only "helper" springs.
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i shouldve done that before they just painted the car.....ill save them for the next project car, i am just goin to stick to the torsion bars not really goin to track it, but i wouldnt mind a good handling street car......next on the list soundproofing then interior pics to follow