Mark Farver wrote: > > I ran my Ranger on a chassis dyno, both before and after conversion. It > wasn't a very scientific process (my batteries were a little low when > the run was made, and we had some troubles measuring motor RPM), but the > results are interesting. > > http://www.mindbent.org/evranger/dyno/ > > The Siemens/MetricMind AC drive didn't put out quite as much horsepower > as the stock 2.5L 4cyl (not too surprising, it is designed for smaller > vehicles) but the torque curve (or lack of one) is neat. The > gearheads at the performance shop were I made the runs were quite > impressed. > > Mark > This is interesting data!
Question 1: - the cliff position where constant torque turns into constant power (4,400 RPM in your case) depends on the voltage. What was the battery voltage during test? Looking at theoretical curves for 5133 motor, sounds like the voltage was lower than 280VDC during the test. http://www.metricmind.com/line_art/plot_all.gif Question 2: Why the curves end at 5,700 RPM? For fun, you can temporarily put some extra batteries in the bed to make system voltage 380V and test it on dyno. It will outperform stock ICE engine. Victor
