Spring rate for 12 inch front coil overs on a 3000ish lb car no driver

[venom1997]

Currently running 12-150 but my spring is adjusted all the way up to get my ride height to 26 inches at the fender lip I’m thinking a 12-200 might be better? Or a 12-175? I know I can go to a 14 inch spring but I heard of spring bending and binding with that. Also they sell spring spacers that go under the spring to raise it up say an inch would that be ok for my current set up with full weight in the car I have about 3/8-1/2 of an inch between coils touching

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[venom1997]

Would I be able to just use one of the on each coil over base adjustment screw it would give me 2 inches more adjustment although I only need 1 inch up higher to left my front end but it beats buying a longer 14/150 spring


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[9397SVTs]

I think it depends on what you are trying to achieve.

If it's only ride height, a stiffer spring rate a longer length will suffice.

If you want weight transfer along with ride height, a longer spring at the same rate, or even less, would be a route to take.

Based on your pictures, your current spring length is too short.

Regardless of which way you go, select a spring rate that provides a 25%-30% reduction in spring length when the car is static. The higher the percentage, the higher the stored energy and weight transfer.

 

[venom1997]

I’m going to go with 14-150 to help weight transfer my 12-150 coils are 7 inches total length compressed as it sits now so I know I have 750lbs on each front corner or 1500 lb in the front


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[venom1997]

So that’s my current rake it’s 2 1/4 inch difference from rear to front I’m gonna just pick up some of those 2 inch spring spacers since that is the cheapest easiest route so I can raise the front 1 inch and still keep the 12-150 spring rate up front I don’t have any coil bind and in the future I’ll be removing about 100lbs off the nose by moving my battery, water methanol tank and pump to the trunk also I’ll be removing the crash bar


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[railroad]

Although you are using spring rate to achieve a specific ride height, they are totally separate functions.
The compression rate and ride are spring rate results.
Ride height is the length of the spring and or spacers.
If your coil overs are adjustable use that for rebound and compression in your type of driving, street, auto X or drag racing, etc.
I think spacers are a good solution, if you like the spring rate.
good luck,

 

[venom1997]

Thank you yes I’m learning this car still as it used to be set up for auto cross going to drag is a rough one to get the power planted


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