Yes, I meant compound, but sizing is important as well.

 

Just curious why you suggest to limit the rates to those numbers?

 

I had 1000lbs on all 4 corners. I had 650x4 but was squatting to bad from down force.(full areo)

 

They're a good starting point for a new track-mostly S2000. I'm running 628 lbs/in front and 571 rear and the car handles extremely well on our east coast tracks. I started with 515 all around on KWV3s and think going over 700 front and 600 rear would be too stiff for a mostly stock, non-caged S2000. I know the west coast guys tend to run stiffer springs though.

 

Start out with the softer springs since you are new to the track, and will be using street tires. Softer springs transfer weight slower. The car will be easier to drive than if it was stiffly sprung. I am on KW V3's with 515# springs all around running Hoosier A6's. My car could definitely use more spring, but it still handles predictably. Not to mention, it is very easy to drive fast. When I was on Toyo RA-1's (100 tread wear) it felt about right. Rob's suggestion - 600/500 should be about perfect for you.

 

Do you think it's easier to drive with rates not too stiff? Would this apply to STR/street tire autocross setups as well?

 

honestly. If you are running a track/street tire, maybe nitto nt01 or hankook rs3... i would recommend a setup like we run in STR, very stable on the track for me. 900front 800 rear. i wouldnt go any softer but thats me. also disconnect rear bar if you are new to track and want something easy to drive.
especially if your not stiffening up front bar much, you will need fairly high front rate springs to get the roll rates up to ideal.
how much "correction" are you planning to do on front roll center? ap1 or ap2?

 

Let's make sure everyone is talking lbs per inch on the spring rates.


In general a stiffer suspension is easier to break lose so a (relatively) softer suspension is better for newer track drivers. A more experienced driver can be smooth enough to get the most out of a stiffer suspension.

 

I think 600/500 with stock bars is a good starting point

 

Yup, and a lighter weight car doesn't require quite as much spring as a heavier car to maintain the same natural frequency.