I'm not sure how it equates to the 160-180 coil, but I usually run 55 psi in mine. I've tried 40 to 60 psi and 55 seems to give me the best overall ride/handling for the type of mountain riding I do.
FWIW the sled is a 153", has a Float 3 EVOL on the rear arm and I weigh about 170-175lbs.