I did some testing with springs on my 330 today and here is how it went.
stock spring(blue/green) engagement rpm -1300 shiftout 5770
Polaris white engagment-1750 shiftout 5890
EPI pink engagment- 1550shiftout 5990
EPI pink w/Aaen blue secondary at 2-2 engagment 1550 shiftout 5950
This is just my comparison so take it as that.

 

ftwfth,

Like i said all along that the epi pink is the best setup for the 330. Although I do have a little different results. The pink engagement for me is around 1300 and shiftout with a secondary spring from a Trailblazer250 is @6100.

 

Lots of variables like tires and traction but it does give a good starting point for comparing.

 

Yes there is. Since I put on the bigger tires it did slow down a little but plenty more power than stock. I may do a gear change to get my top end back.

 

ya the epi pink helped out my atp 330 alot. i called erlandsonsports and they said something like, the only better thing than the epi pink, is to switch my clutches to a full roller clutch. i havent looked into it any more though.