To build a complete and thorough map for a snowmobile, the machine must be run under strenuous load on an engine dyno, and also field tested to ensure the tune is satisfactory under all loading conditions. Running a machine on an engine dyno often involves adding auxiliary cooling sections to keep the engine temperature under control, a precision and isolated connection to the crankshaft, as well as many other details which are far more complex than just rolling a car/bike onto a wheel dyno and tightening some axle straps. Many years ago, Dynojet manufactured a snowmobile chassis dyno which measured track HP by removing the stock skid and replacing it with a rigid skid containing measuring idler wheels at the rear. Swapping skids isn’t a quick process and the cooling system must still be addressed to make multiple runs with the goal of ending with a complete map.
All in all, the time and effort required to create a stellar tune for one sled is greatly hindered by the mechanics of the machine, while Dynojet must focus on cranking out broad reaching support for all types of Powersports toys.
Also, even though Montana is beautiful and known for its massive swings in weather, we don’t always have snow to go play in to verify our tuning meets Dynojet performance standards.
Access to each and every OEM’s machine is also crucial to building a solid tune database, and MT dealers don’t order any of the trail machines, thus only mountain sleds would be tuned (and yes some sleds running the i.e.: CFI2 engine in the Polaris mountain sled contain an alternate calibration relative to their short track counterparts).