coilover valving

[lan_evo_mr9]

If you have a set of coilovers that came with a relatively soft spring (8kg front and 6kg rear) would you need to worry about revalving them if you wanted to put on a set of harder springs? What damage would be done to the shock if harder spring rates would be put on without revalving?

[Bishop Motors]

It really depends on the brand coilover you have. Most companies allow for a +or-2k spring change right out of the box. If you need more spring rate you will have to revalve. The higher spring rate will be too much for the stock valving and the car will bounce over bumps instead of absorbing them. Eventually you will blow out the shock. I suggest contacting the manufacturer of the coilovers and see if they can revalve them for the sring rates you want to run. I speak from 10 years autocross experience. I have had this problem early on in my autocrossing days and it is not fun or fast around a track when your shocks can't handle the spring rates.