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  #16 (permalink)  
Old 08-16-2019, 07:02 PM
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235 r15 is going to get you lower cost tires. You can run a all season or winter 235 for under $100ea.

The spring rate can be calculated to get close. But it is really a butt test thing, with something that YOU feel is right for your driving style.

Record your current springs. Get the thing moving. Then you can adjust the rate to fit you.

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Old 08-16-2019, 08:03 PM
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Begin by finding the coil diameter.
Measure the outside diameter of the spring. (for instance 5.375") Write it down.
Measure the inside diameter of the spring. (for instance 4.125") Write it down.
Add the two figures together and divide by 2. (for instance 4.750")
That is your coil diameter.

With a micrometer or dial caliper, measure the wire diameter.
(diameter of material that the coils are made of, for instance 1/2 inch (0.500"), 9/16 inch (0.5625"), 5/8 inch (0.625) and so on. If the car is together, just hook the jaws of your dial caliper or vernier caliper or electronic caliper onto a wire and measure.)

Count total number of coils, subtract a coil for each coil that touches, these are dead coils. Ground flat ends are a dead coil. Start count with cut-off end facing you. Directly above would be one and so on. Not all coil springs are evenly coiled. You can have 1/8, 1/4, 3/8, 1/2, 5/8, 3/4 or 7/8 of a coil (Example 10 1/8 coils, which would be entered into the calculator as 10.125).

Here is your online calculator.....

Easy Peasy.

The rest of you yay-hoos should bookmark this site. And remember, a number that is a less than the whole number 1, should have a zero to the left of the decimal point so that the person reading it knows that the number is less than 1. For instance 0.750" for 3/4 of an inch.

Last edited by techinspector1; 08-16-2019 at 08:19 PM.
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