Don

The pipe can be too small and too big! Both lead to low static thrust, the smaller dia high temps too!

A P60 with a 90-100mm (3 1/2-4") pipe designed for the G-Booster 80-90 produces very little static thrust, even throttling off and opening up involves a long wait for thrust to come back.

Overal pipe length will make a difference, the Wren designed MW54 pipe is the best we have used with a P60.

Dave Wilshere

PS Really he is right...