OK, I really don't know why an engine needs a psru. I'm going to run a 140 hp turbo Subaru and full horse power is at 4800 rpm. As long as I don't jab the throttle into the back of the engine (like one of my early instructors thought was the way to get an airplane into the air) but ease it in so as not to stress the crank do I really need one? I am going to use a 72 inch Sensenich prop. Ideas and recommendations wanted and appreciated.
Thanks
Steve