I have the Maptuner X + Dealer service app in my shop, put stage 1 tune in my 2017 850 165 X & my 2021 850 Turbo 165 Expert. Both running DJs Ibackshift Clutch Kits. Talked to Joe yesterday about what clutch changes will be needed. He told me general rule of thumb is to add one gram per 5 HP from the great set up I had before the Stage 1 tune.
I run 966 ramps in my 2017 and with Ibackshift kit I really like the 3000ish engagement
+ perfect 7900-8000 rpms all the time.
So I will be adding 2 grams to my 2017 & 4ish grams to my Turbo for my initial testing. Need more snow before I dare go out for testing.