RE: tuning a vmax 46, HELP!!!! please!
The symtoms you decribed here are not all that uncommon.
First, are you running the Vmax muffler ? Or an after-market muffler ?
What prop are you using ?
Is the fuel tank in a conventional location (Behind the firewall) or is it mounted away from the engine (near CG) ??
Assuming a conventional setup for a moment, with nothing more than a 10x6 prop ....
What you decribed is an engine with limited ability to draw fuel, or insufficient muffler pressure.
It needs either a bit more backpressure, or a bunch more tank pressure