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Discussion in 'Electric Motorcycles' started by swamp, Jan 12, 2018.
The end of that video was money
I started yesterday to look into the idea of an electric clutch. The first thing is to understand what is there, on the bike and how it works. From the "throttle" there is a harness that contains four wires (red, black, white, brown). It would appear that the R is positive 12V, Bk is ground, and W and Br are signal wires to the ECU. There is a circuit card or something in line before the harness connection, this is an unknown. I want to tap into the signal to the ECU and place a potentiometer, in series to further alter the signal to the ECU and limit current to motor. I have yet to find a schematic (2017 MX Redshift). Can anyone help or comment if you have already done this? Schematics, pictures, diagrams, numeric values, etc would be very helpful so I don't have to reinvent the wheel. A clutch would make this bike even more awesome than it already is in gnarly singletrack.
I spoke to the manufacturer of the EM clutch yesterday ... the EM throttle signal simply varies voltage from 0 to 5V, the clutch, the handlebar map switch and even the mode switch all just limit the max voltage the ECU sees. One thing I’m not sure is whether the potentiometer he used for the EM is limited to 5V max or whether it would handle and correctly vary 12V (if say that’s what the Alta uses).
I should have the clutch in hand next Thursday so I can take photos if that helps but the electronics is all tucked away in a CNC machined enclosure..
You could run a cable clutch into this thing to attenuate your throttle action, perhaps. Not sure if it is a Hall sensor inside or a potentiometer.
Is the Alta throttle a Hall or Pot?
I have not seen anyone do a electronic clutch for a ev bike yet, it's a interesting concept. Some EV bikes have what is known as a zero travel switch, it's a standard micro switch that is only activated when the throttle is fully closed. It prevents the ECU from engaging drive when the throttle is partially open. It's possible the other 2 wires connected to the throttle are for one of these, but I am not familiar with the throttle on Alta's. It would be worth checking the voltage of the red wire at various throttle openings using black as a ground reference (bike secured rear wheel off the ground). It is also possible that the throttle on the Alta uses PWM vs a voltage range.
If the throttle works through voltage change, rigging a second lever actuated pot in-line would not be impossible. However you would need to calculate how much the pot would need to turn so output would match your voltage readings at 0 and 100% throttle. Also keep in mind with the clutch lever pulled it it would be sending the same signal to the ECU as when you fully let off the throttle, so regen braking would kick in.
I have to admit that I am kind of obsessed with the Alta Redshift EX. If I was within 2 hour of some good, legal single-track, I might have bit the bullet. As it stands, the legal riding out here is mostly open Pine Barrens ride that usually go between 40 and 80 miles and dual-sport events that go between 70 and 100. Would need another bike for those, which is a tough bullet to swallow, even if leftover 2018s can be had for $9k. But man, oh man do I want this bike...
I'm with ya man. Ready to buy, just need more range (or a swappable battery) to feel 100% comfortable with the investment. It seems the evolution of 'proof' for Alta would be:
1) Complete a hard enduro race here in the US. That would be enough proof for me
2) Complete a 2 hour enduro race with an 'A' level rider. That would convert even more lookey-loo's than the step above
3) Complete a WORCS/SORCS type hare scramble or an AMA MX race. That would seal the deal forever on gas v/s electric---but I would still keep my smokers for the sheer pleasure of fanning that clutch ;-)
Are dealers selling 18's already for $9k?
I can't believe no one out there is working on this idea of the electric clutch for the Alta. Has anyone found an Alta schematic that could be shared? It would really help.
Took a ~5 mile demo ride on a 2018 SM today.
Super light, wicked acceleration, amazing suspension & braking.
I was blown away - so impressed!
I am in very good standing with my local KTM/Husqvarna/Alta dealer, and have been offered a demo on the Alta EX (dual sport) before.
I'm afraid to take them up on the offer - I really like the idea of having the SM.
BE CAREFUL.............. that's how it started with me, just a test ride. It followed me home!
I mistakenly took an EXR for a test ride... Now it's helping me tear up my property. From low speed precision/technical work, to high speed runs through the woods, this machine does it all! It has become my new go to tool for getting around my property and neighborhood.