Good thread. We have been working closely with 10 or so M1100 Turbos this year. These sleds are stock units, improved stock units, and mods 275-300 HP. I for sure don't have the answers, but would like to share some observations on the sleds we are riding.
Our main elevation is 2500-7000 feet with the meat of the deep snow hard riding at 4000-6000 feet. Our snow is normally fairly heavy with high moisture content. We are generally harder on belts than higher elevations with lighter snow.
I personally have wanted to see the TCL eliminated since early riding season last year. As the time goes by I believe more and more in this helping to remedy this situation. I don't know if this is the answer but the marketing of this was better belt life and a fatter wallet....and we all know how that went.
Getting the motor square with the driven shaft is a whole different animal if all you have to do is get the motor square in the chassis as needed. We have all witnessed the motor pushing the driven shaft around. It is this action that makes me believe no matter how straight it is... it does not stay that way under load. I recently had the driven shaft out of a very low mile M1100 Turbo and could not believe how much of a motor mount the driven shaft was required to be. With nothing but the driven shaft removed and everything else secure the motor was easily moved around with very little effort. A better set of left rear and right rear motor mount inserts were installed (C3) and much of this movement went away....driven shaft still out.
Below is a list of some of our observations this season.
1.All of our M1100 T models (regardless of mods) that have been ridden hard in deep snow have as Matte said "core of the sun" clutch and belt temps.
2.The stock ones go much farther on belts than the mods
3.The clutching has to be loaded heavy enough for the mods. They have to stay off the rev limiter. The closer the clutching to running up to 8000 and settling in 7800 ish the better. The more they hit the rev limiter the harder they are on belts.
4.We are not able to use anywhere near the same clutching as the higher elevation lighter snow states....our sleds are hitting the rev limiters constantly with the same clutching said to be working south of us. This applies mostly to the 250 + hp sleds
5.We have had many of the mods working good going day after day on a belt in super steep and deep and then all of the sudden boom and not always in a hard pull.
6.All... and I mean all of our 250+ HP sleds have had issues in the chain case.
7.The sleds have been an absolute riot to ride but all of the big HP ones usually need a trip into the garage each ride to tighten adjust and repair so they would not break in the mountains...always drive system....motors run spot on always.
Woody