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[PWM]

U-da-man Sam.



A dyno-run is a good bench mark and your results looked stellar and for all the reasons mentioned numbers don't lie.

Superbly Done.

[ultrarnr]

Very interesting! Something I noted is the speedometer error. So the actual top speed is 225km/hr/140 mph while the bikes speedometer shows 250km/hr/155mph. On my Ribelle 77mph shown is only 70mph actual. I am guessing the actual top speed on a Ribelle is around 112-115mph if the speedometer is showing is 125mph. It would be interesting to see a graph on shown speed vs actual speed. This is why if I really want to know my actual speed I look at my gps, not the speedometer. At lower speeds the difference between shown and actual is smaller so hard to know without a gps how fast you are actually going. Is this really the best Energica can do?

[Richard230]

I have six motorcycles; one group with speedometers that read high and one group with speedometers that read accurately. Both of my BMWs read about 8% high and my Royal Enfield reads 5% high. However, my Zero, KTM 390 and Yamaha FZ1 all read within one mph of the true speed, according to the many speed check signs that I pass on every ride. I might also mention that my 22-year old Saturn station wagon also has an accurate speedometer.  So it is possible to make a speedometer that shows the correct speed - if that is what you want to do. 

[NEW2elec]

The little speed computers on bicycles use a magnet sensor that shows each wheel rotation.  To get it spot on you have get on the bike with full tire pressure and roll forward in a straight line (meter stick) and then measure it (full rotation) in millimeters.  You plug that value into the computer and get your correct speed and distance.

I think some bikes measure the motor speed but as you tire distance changes with pressure or size it will be off.  Plus a little marketing puffing is also likely.

A good GPS unit with a clear sky will get a good speed reading too.

Sam, it would be very interesting to see the dyno on the new battery bikes and see if all the extra power can keep the full HP for longer.

[Richard230]

The little speed computers on bicycles use a magnet sensor that shows each wheel rotation.  To get it spot on you have get on the bike with full tire pressure and roll forward in a straight line (meter stick) and then measure it (full rotation) in millimeters.  You plug that value into the computer and get your correct speed and distance.

I think some bikes measure the motor speed but as you tire distance changes with pressure or size it will be off.  Plus a little marketing puffing is also likely.

A good GPS unit with a clear sky get a good speed reading too.

Sam, it would be very interesting to see the dyno on the new battery bikes and see if all the extra power can keep the full HP for longer.

I installed one of those bicycle computer-speedometers on my Royal Enfield as the stock cable-driven speedometer is kind of unsteady and provides random accuracy at different speeds for some reason.    After being set up as you mention, the digital bike speedometer is steady and dependable and even includes a clock.