Rear coilover spring rate ?'s

[ChrisinVT]

I tow alot with my Lumina, and recently the rear struts have bitten the dust. The rear leaf spring is starting to devolop some sag from towing also (currently about 1-1.5"). I'm going to build a coilover kit to use as helper springs in the rear of my car.

I'm planning on keeping the monoleaf, and adapting the struts to coilovers. I'm looking into getting a low springrate (I'm thinking 110, 130 or 150) since these will be used as "helper springs" to eliminate sag and sway when towing a trailer. (I'm also thinking about pulling a swaybar off a Euro to help stiffen up the rear a bit more also.) Most guys seem to run 250lb springs when doing a full monoleaf delete, but since I'm keeping the [saggy] monoleaf I'm thinking I should go with softer coilovers.

These are the parts I'm looking at:

• (2) Coilover sleeves
  (2) Coilover Nuts
  (2) coilovers
  • 110 springs
    130 springs
    150 springs

Just looking for some input on what rate springs would be best for my application. I don't want to go too soft and defeat the whole purpose of doing this, or go to hard and have to swap to something softer.

[jeffcoslacker]

Just a question...are you sure it's not missing some of the bushings that provide the arc to the leaf?

Monoleafs usually won't sag...but they do like pop bushings out and lose arc...

[ChrisinVT]

Originally Posted by jeffcoslacker

Just a question...are you sure it's not missing some of the bushings that provide the arc to the leaf?

Monoleafs usually won't sag...but they do like pop bushings out and lose arc...

Yup, everything's there. Even pulled the rubber shit off the ends and put the polly pucks in there.