Originally Posted by
Roelof
Calculate how much liter air is going through the engine per minute at full speed, thats about 40 liter air per minute.
The turbo is a closed system so all air must be provide by the air pump, is that little thing capable of blowing more than 40 liter per minute?
It's not a closed system. You are thinking of a positive-displacement supercharger like a Roots supercharger. The RB "supercharger" is just a belt-driven fan, similar to a centrifugal supercharger except manufactured to much looser tolerances. Air can get around the fan.
Again, I'm not saying the RB "supercharger" is actually pressurizing the engine. There is no way it could do that. But it might reduce the vacuum in the intake a little bit at high RPM, and a slight improvement in airflow would translate to a small but noticeable increase in power, especially in an engine with mild timing and a carburetor that is too narrow. The TRX 3.3 does indeed have a carburetor that is too narrow. People have been fitting TRX 3.3 engines with wider carburetors from the Losi 3.4 for years.