Human perception is force that the vehicle makes, which is directly related to torque. So, if torque was constant from 0 rpm, we would feel the exact same pull from 0 to 3200rpm.
What we don't perceive is power.
Not trying to put words in anybody's mouth, but I believe what Biff is saying is that we're all used to ICE vehicles, which have more rear-wheel torque at very low speeds because they have a comparatively low first gear, which multiplies the torque available from a dead start. We're all used to that feeling, from having driven ICE vehicles all our lives, so an EV with no gears and therefore constant torque available all the way down to 0 rpm can actually feel somewhat weak on bottom because it doesn't have any torque multiplication going on.
I'm pretty sure that's why Brammo put a gearbox on the Empulse. It just plays better to our pre-programmed feel for vehicle acceleration.
Yes, that is what I am proposing, I also think that dropping the clutch to give a sudden jolt at 0mph in an ICE vehicle also sets our expectations for "quick" acceleration.
I know 2 tings for fact ..
1) prettymuch everyone who rides a modern Zero says "it feels slow below 20mph, but then above that it really pulls hard"
2) the torque (and hence acceleration neglecting air resistance) from around 400RPM (7mph) up to 3000rpm 50mph is pretty-much constant, Instrumentation from Motor Speed, GPS, accelerometers and dynamometer all agree on that, the dyno charts show that there is about a 7% increase in torque between around 40 and 60mph (depending on model)
everything else I say on the subject is just theory, and I try and present it as such.
-ryan
Author
Topic: Has anyone dyno-ed a bike yet? (Read 3097 times)