Before, the fighting starts let me just say that the cooling issue has been the only problem. We have successfully installed and ran a supertiger 40. heli engine in a traxxs sportmax! It has produced a heck of alot more rpms, and speed then the 2.5 that comes in the sport maxx.

Krusty is absolutly right about props and under load rpm! This is not the factor..The problem is even with the heli head cooling fins the engine is getting way to hot...Now we have compsated by installing a small cpu cooling fan from radio shack to below across the motor with the body on!

Even though this combo will exceed the traxxs 2.5 and whoop it's but all over I don't reccommend it for the performance issues and mods that we have encountered....

But YES it can and has been done....And yes it is faster, No it hasn't been Fun!

Hope this helps and stops the fires about to brew!

Tom (fuelguy)