Lots of reading here for you. It all depends what kind of “legs” you want the sled to have. If want flat out fast - then buy the R, if you want something f comparable to a 600 - then buy the 900T.

900T vs 900r performance-reading between the lines

The differences seem pretty straightforward and nothing huge so unless I am missing something, making the 900T perform like a 900r should not be too difficult. 1) slightly larger inducer/compressor on turbo (cover and wheel swap?) 2) stronger wastegate spring (already available aftermarket) 3)...

www.dootalk.com

 

Whalen 2021 900T compared to 900R

I've been looking at used 900T sleds. Does anyone have any insight comparing these two sleds, specifically the throttle feel? I'm 90% sure my next sled is a 900T. I didn't care for the throttle on the 2020 I tried. I'm told it's significantly better with a Whalen tune. I'm wondering If I should...

www.dootalk.com

 

We have both the 21,T, and a 22 TR..Zero differance even after the TR update..

 

So the only difference is programming, and it can easily be done? But you don't notice anything when riding once it's updated?

 

Last one and then I’ll leave you alone. Lol

900T impressions after 3,500km / 2,174 miles

Wanted to share my impressions of my stock 900T XRS as a lot of ride reports are from tuned/flashed 900T sleds on big wide open trails. To date I have 3,500 km(2,174 miles) and most of this mileage is in very tight and twisty trails here in my area. I am a seasoned rider with 35 years of riding...

www.dootalk.com

 

The 900 Turbo R has a new throttle module, the old ITC is replaced with a cable throttle more similar to the 2-stroke throttle. It's supposed to have a faster response

 

Power and Refinement for the 900 ACE Turbo Series

Jean-François presents the 180 hp Rotax 900 ACE Turbo R and the 130 hp version

sledmagazine.com