Coil Over Spring Rate

I'm in the process of building a 4 link rear setup using coil over shocks and am wondering if someone could tell me a safe spring rate to choose? It will be street only.

Thanks

 

afco shocks 8oo 632 2320 exr 202 great guys

 

Are you cutting out the floor and tubbing the car? If you are then 120 to 150 lbs springs should be ok I have 130lbs spring in my car that is drag only But if I were to make a street car again I would go with the 150 lbs springs for a better ride. If you are not cutting the rear floor out the springs are going to be 220 or high I would guess

 

I'm wasn't planning to cut the floor out.

How would that affect spring rate? How high the springs are mounted on the rear maybe? I wanted to mount them low behind the rear just behind the 4 link mounts. That way they should fit to a crossmember just under the floor board.

Chassis Engineering also sells a set of top and bottom spring mounts that allow you to use a small diameter coil over spring but use a regular heavy duty shock mounted through the center. It would save a ton of money over coil over shocks, if they work. Any thoughts?

Like I said - not drag racing - just for the street.

 

This is the spring set up I was looking at from Chassis Engineering>

 

Good link - I talked to AFCO today and their suggestion is to go with 150 or 175 pound rear springs for the street. Their 5 inch stroke non-coil over shock (#1564) with 12 inch coil over spring, using Chassis Engineering's kit may fit without cutting the floor out. Also their rule of thumb on spring/shock sizes is 5 inch shock/12 inch spring - 7 inch shock/12 or 14 inch spring.