no, don't run a 2200kv with 6s on your buggy. Your tires will flair out like saw blades down the straight and throw your tires off by the 2nd qualifier . I'm not sure what kinda tracks your running where you live but but if its a technical track you should not need more than 1700-1900kv for 4s. I'd only run 1900 to max 2200 on a huge very fast track. Also, how is your body's ventilation? Many of those ESC/motor fans only have rating of 7mph of air. If you think about the avg. buggy speed being 15-25mph, having better more directed air flow in your body is actually more effective. That can't explain your hot diff but great air flow will help.
Side note: Most truggies running 7-10k center's especially with 2200 to 2650kv motors have alot of unloading on the front, which works the center diff alot (hence your possible heat issue). I run a castle 1800kv truggy motor and had to get the center to 15k just to stop the crazy front tire flairing when gunning it out of turns or down the straight. 20k for that high a kv motor might be an option if 15k still unloads to the front too much. Unloading in the front can feel like a stabilizing thing when exiting a corner but keeping power to the rear really shoots you out faster. Thats why you don't see front wheel drive drag cars. Plus if you are flaring or unloading rpms to your front tires things get very unstable if you are trying to turn or correct at that RPM.
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