To Coilover or To Spring

[CobaltFilly]

They are pretty much equivalent.

Good to know. I'll get whatever is cheapest then

 

[Fabman]

Go with coilovers, to get the spring rate and ride height flexibility. The number of damping adjustments is not as critical initially, even single adjustable will work better than street style struts and shocks. Also if you switch cars later they will swap between s550/650 easily.

I would find a way to budget for better tires, RS-4's are not great and will make for more handling challenges than you want. If you need to stretch wear out over a season, consider the Conti ECF. It is the spec tire we used in WRL and will take a beating lap after lap and be faster. The new set we ran 15hrs at cota still had another 30% or more tread left. You can see the grades below from GRMs tire testing.

View attachment 107174

Great post!

 

[bnight]

As an aside we run 600/800 typically on Nick's DHR. That is with coil over rear of course. My car is 750/850. The motion ratio/lever of a spring in the OEM location would be equal to over 1000 lb/in. The Steeda front is really light even at 225 lb/in.

600 front usually require around 1200 lb/in in the OEM spring location. But very hard to find springs that high. Which is why Ford switch to a real coilover rear in the GT4's, DHR cars. They even have a special rear control arm made for the S550 GT4 cars. I think the DHR cars use the OEM Rear control arms with just Cortex Bearings in them.