We finally got to make some pulls on our DynoJet chassis dyno (500 hp ATV, motorcycle, gokart version) and Mr Goat got to be the first vehicle on the dyno. This is an inertia dynomometer and with Mr Goats very low gearing each pull lasted under 2 seconds. When you opened the throttle from an idle the thing would hump up on the roller and immediately reach maximum speed.
With the low gearing it needed less than 2 hp to reach maximum speed and spool up the torque converter.
To really test for hp you need MUCH higher gearing that will allow for a longer pull (slowly opening the throttle helped some and generated higher hp) and no torque converter. The torque converter really gives some weird curves for certain functions the dyno measures.
I'm not sure when I can arrange these but our next tests will be with a Suzuki Hyabusa and a 150 hp Kawasaki triple that I built for a customer over 20 years ago. The Kaw ran in the low 9's on a road race slick years ago.
