Originally Posted by
ShortCourseOnly
There has been very little action on this thread. I have my 121VR running very well now and am looking for your advice on pipes. I am using the Reedy 2035 pipe right now and I was wondering if there are other pipes that improve fuel economy.
I am using the 7.0mm veturi and P3 plug with 0.50mm shims. What changes would impove fuel economy? I am running my RC8.2 with stock ring gears and 44/16 spur/pinion. It runs great and I am consistantly getting 9:15 run times per tank.
I have a 6.5mm veturi on order and could even increase to a 17t pinion. What will these do for performance and fuel economy?
A smaller venturi will reduce power and increase fuel mileage. I heard people having runtime issue with smaller venturi but you should be fine with a 6.5mm.
A bigger clutch bell will reduce acceleration and increase top speed. In theory, you should also save on fuel.
I have the exact same engine, glow plug, pipe and buggy with the same runtime.
I switched to a 121VR-ST which is a little more powerful version. It increased my runtime a little bit, mainly because I have to control my heavy finger.
I think the best to increase your fuel mileage, is to try to be smoother on the throttle.