Hey, thanks for the plug Keith. I haven't been on the Nitro forums for a while. Ever since the new T Maxx came out with the new engine, I haven't had much work comming in for engine porting.
Guys, I can promise you, there is no engine that "tunes itself". The OS engines are quality engines, but they are expensive to buy, and maintain.
IMO, the biggest reason the Traxxas .15 wears out pistons and sleeves so fast, is because they do not make alot of power in stock form. This leads to people running them lean to get descent power out of them.
I can tell you this. A properly ported TRX 15 engine, with a big tube header, and an AE pipe is the best over all engine I have ever found to run in a T Maxx. Properly tuned, and running on a quality fuel, with the propper oil content, they will take some SEVERE abuse, and make really really good power.
They will make AWESOME power when PROPERLY ported, and with the correct header and pipe, and the parts for them are everywhere and CHEAP.
The engine Keith tested for me didn't even have a big tube header on it, or an AE pipe. I sent him a ported stock header, and a reworked stock plastic T Maxx pipe.
Everyone has thier own opinion. Good luck with your truck, just try to have fun and learn from your mistakes.