This a copy from another thread, I'm using Racinstation
http://www.snowestonline.com/forum/showthread.php?t=198045
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I would like to add a couple things about the Power Commander 5 and autotune. I work at dynojet and do product development and testing for the snowmobile products so I have lots of time working with these units.
I want to mention that the best option for most consumers is going to be using a map that was built by a pipe builder or tuner. There are a number of diffrent sources for the snowmobile maps and they are starting to cover most sleds and most modifications.
Map Sources
Starting Line Products
Dynotech Research
Speedwerx
Racin Station (Teton Motorsports)
Dakota Performance
These people have been working hard at building maps for diffrent combinations. Dakota Performance has turbo maps for the Arctic Cat 800 and 1000 while the other companies have been covering the naturaly aspirated setups.
Autotune works by comunicating the AFR of the engine to the Power Commander 5. Then the Power Commander seeks the AFR that you have specified. Autotune is a good tuning tool if you know what AFR you want. Autotune is still going to take some time and you may need to manualy edit some of the trims to perfect your map.
I will try and keep an eye on this topic and answer questions when I can. I also watch a Power Commander thread under the Performance/Modified section.