Just wanted to share. I just rebuilt the 2.5r engine, and broke it in. I am now tuning for speed. The thing is soo fast I can't keep the front end down and the rear wheels are bald, but I have such low temps I can't believe it. I am only getting to around 150 degrees. I've had many different engines including different traxxas engines but never this performance with such low temps!! Any ideas why?