Hey everyone, dont post here often but I had just recently learned of adjusting preload to get the best amount of damper travel while still accounting for rebound. I tried to searching but none of the articles i found really cover this.

This is for a G35 with corner weights at roughly 850lbs(+/-50) on ksport coilovers with true coilover in the rear (yeah i know theyre junk but its all i got for now) spring rates are 11k front and 5.3k rear

Can anyone help me out on doing this?

*side note
I'm currently on 12k front and 11k rear springs(the ones mentioned above are coming in the mail) and at zero preload it looks like i have about 1" to 1 1/2" of travel before i hit the bumpstop. not so gravy...

 

Sorry for the double post

I did some research and after some number crunching i think i may have got it. I assume that the best position for the damper piston would be when the spring is compressed 25%. That way I gain 75% more compression from 0 preload yet I still have 25% of damper travel to account for when the car goes into negative load.

With roughly 850lbs at each corner of the car, I calculated that 75% of that weight is about 637.5lbs. Using a 5.3kg/mm spring, I would need compress the spring just over 2mm or 1 full turn of the collar plus a 1/16th of a turn to achieve 25% spring compression when loaded with the weight of the car.

I have a feeling that my assumptions and calculations are wrong so i encourage someone to correct me.