Lowered 510 Survey

[Ward Hill Press]

If you lowered your car using D50 springs in the rear, how much did
you cut, what size spacer if any did you use and what is the height
at the rear rocker (not pinch weld)
I'm trying to apply the Carpenter's Rule: Measure Twice, Cut Once

[Brock Johnson]

Keep in mind this was over 20 years ago.... as I remember.

I cut the D50 springs to match the front spring rate of 150# calculated by wire thickness and divided by the 3.9 ratio. I don't remember how many coils that was.

I installed the springs but the car was a bit too low. I cut up a 3/8 piece of HPDE into donuts to shim the springs which gave me the ride height I was looking for. (slightly lower) The shims were placed between the floor and the spring isolator rubber.

The front has coilovers so adjust that to match.

This worked well for the last 20+ years.

My opinion...

Cut the springs to the desired spring rate using this calculation.

            11,250,000 x wire thickness in inches4

   K=              __________________________________________

            8 x number of free coils x coil diameter3

• Spring rate (k): The final value, typically measured in pounds per inch (lbs/in), which indicates how much force is required to compress or extend the spring by one inch.
• Wire thickness: The diameter of the wire used to form the spring, measured in inches.
• Number of free coils: The number of active coils that can move and compress.
• Coil diameter: The mean diameter of the coil, measured in inches. 
• divide by 3.8 to get wheel spring rate.      

Then shim to get your desired ride height.

Brock

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Rear Wheel Drive, the way God intended.
If a car is being pulled from the front, doesn't that mean it's being towed?

I can explain it to you, but I can't understand it for you.