C5ZEE06

I picked up a used set of Pfadt Featherlight DAs and sent them to RE suspensions for service before installation. What f/r coil spring rates has anyone had good luck with ?
Mine is a dedicated HPDE / TT car driven to/ from track events.
No aero
T1 bars
Poly suspension
18x11/12 C14s ( 315 / 335 A's)

Any suggestions ?

C5ZEE06

Any suggestions ?

maw455

I'm running 800lb front, 700lb rear on my featherlight SA's. C5, T1 bars, poly bushings, w/ aero, 3000lb (no driver). This was based on discussions with Pfadt Racing & Blackdog Speed Shop. I'm very happy with this set up. Aero is "moderate", meaning COT rear wing (60" wide) with ACP front splitter (no under tray) & vented hood.

C5ZEE06

Thanks for that.

They are currently fit with a new set of 750# eibachs on the front. Rears are of unknown rating / manufacture (although they are marked / stenciled with "A10.7 x 215" whatever that means). I'd just assume keep the fronts.
Does 650# sound about right for the rears - w/ no aero ?

maw455

Pfadt initially recommended 600# rear w/ 750# front. I was replacing T1 springs and wanted a stiffer spring rate at both ends, so I decided on the 800/700# springs. I'm no expert, but 750/650 should be a good starting point. Give Pfadt a call. They are great about supporting their products, used or new, and they can give you further insight. They might be able to tell you what your current rear springs are. Plus, springs are relatively cheap (about $80 per corner) and easy to swap out.