still have rpm issues

[miner700]

engine rebuilt clutch side fried--new 1-14 map put a dyno jet controller on it can hit 8300 but will only pull 8050 what part of my clutches need worked on. i think i need a little stiffer primary spring, maybe a lower angle helix. the sled is pretty stock and i run from 6500 to 9500
thanks for any input

 

[aebsledder]

I think I pm'd you my clutch set-up, so let me know if I need to resend it to you. One thing that I changed that made a difference other than my clutching is the exhaust valve springs. I went to a pink spring from slp and it gets to and holds rpms much better. If you have the chance, look at your exhaust valves at WOT and see if they are opening all the way. Mine weren't. My friend with an 08 D8 changes his springs as well and noticed a difference. We ride the same elevation, so hopefully it should work. Good luck.

 

[miner700]

no rpms

absledder- first thanks you did send your clutch set up to me and i was going to get it blew the sled up and lost everything u sent. if you could tell me again i would appreciate it