Here's a chart I made of some of the more popular springs for tuning a Polaris clutch for the Dragon 8's. When looking at a graph of these the clutter makes it harder to evaluate, IMO. For those that need more R's (and can't go lighter on the weights) a primary spring change may be a practical alternative. For most sleds the stock Bl/Purple in the driven is all you need. The Bl/Red allows some belt slip with the 1115 belt while the Bl/Purple has just enough side pressure. Anything stiffer is just wasting HP, IMO. Polaris limits finish rates to 340#'s on their selection, Team maxes at 345 & SLP (adjusted for length) maxes at 360. Since the clutch loses efficiency at higher shift points, too high of finish rate can result in a sled that doesn't "pull" good & in some cases R's won't increase as finish rate is increased. I like to look at the crossing points of the spring I'm using and the spring under consideration. If you boondock you are likely in the 1/4 to 3/4 shift range most of the time.
