With those kinds of temps, the engines actually run a bit leaner. Just make sure you see a good trail of smoke at WOT and have a decent launch from a dead stop. Keep an eye on the temps, you will probably run 260-280. I've heard several people say their TRX engines like to run hot, mine seems too also. As far as plugs go, I just use the standard Traxxas medium plug (I think). LOL