Snagger Posted July 9, 2020 Share Posted July 9, 2020 45 minutes ago, Chicken Drumstick said: Not sure how smooth it would be to change gear on the move with an electric motor though. I can see the benefit of gearing choices however. Especially if you want to haul or drive slow off road as well as at highway speeds. I'm not convinced a single gear or direct drive is the solution. In the RC world, the 'rock crawler' models use different spec motors and gearing. Some even have 2 speed transfer boxes. The fast racing buggies and trucks use completely different KV motors and gearing. I'd imagine it isn't so different when you scale things up. It’s absolutely fine. Why would it differ from an IC engine? The only mayor difference is that for road driving, they’re finding they only need third and fourth, with very few changes. First and second only tend to get used off road. Factory built EVs seldom have changeable gears. Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted July 9, 2020 Share Posted July 9, 2020 1 hour ago, Snagger said: It’s absolutely fine. Why would it differ from an IC engine? The only mayor difference is that for road driving, they’re finding they only need third and fourth, with very few changes. First and second only tend to get used off road. Factory built EVs seldom have changeable gears. I'd have thought it would depend on the electronics. As you'd still need a clutch and pressure plate. Would the motor hold it's revs, or would it drop to very low rpm? I suspect all possible, but maybe more than just slapping it onto the bellhousing... which I think was mentioned earlier. Quote Link to comment Share on other sites More sharing options...
Anderzander Posted July 9, 2020 Share Posted July 9, 2020 The accelerator controls the motor revs though - just like it does on a petrol or Diesel engine . So you can feel it and match motor speed to road speed in the new gear in the same way. Quote Link to comment Share on other sites More sharing options...
steve b Posted July 9, 2020 Share Posted July 9, 2020 ...I see tonight's episode of Vintage Voltage is converting a Defender to full EV , it will be interesting to watch - plenty of room for batteries everywhere , even if they are not 3d printed ... Steve 2 Quote Link to comment Share on other sites More sharing options...
Anderzander Posted July 9, 2020 Share Posted July 9, 2020 What does that show on Steve ? Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted July 9, 2020 Share Posted July 9, 2020 22 minutes ago, Anderzander said: The accelerator controls the motor revs though - just like it does on a petrol or Diesel engine . So you can feel it and match motor speed to road speed in the new gear in the same way. Maybe, I honestly don't know. I'd still have thought, by and large it would depend on the electronic controller. If you have regen capabilities or drag braking, the motor will spin down a lot quicker. Also if you have a flywheel of somekind, this will vary how the motor responds. In an IC car you don't really have to feel the revs, you can just lift off the accelerator and dip the clutch. Be smooth and it'll work fine. An electric motor can be programmed to behave massively differently with relative ease. Quote Link to comment Share on other sites More sharing options...
steve b Posted July 9, 2020 Share Posted July 9, 2020 12 minutes ago, Anderzander said: What does that show on Steve ? Quest 9.00pm the first 2 were a Karmann Ghia then a Fiat 500 ( the real one ) and both motors to gearboxes 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 9, 2020 Share Posted July 9, 2020 Ehem: https://www.autoexpress.co.uk/land-rover/defender/352703/road-specialist-twisted-reveals-electric-land-rover-defender-conversion Quote Link to comment Share on other sites More sharing options...
Anderzander Posted July 9, 2020 Share Posted July 9, 2020 15 minutes ago, Bowie69 said: Ehem: https://www.autoexpress.co.uk/land-rover/defender/352703/road-specialist-twisted-reveals-electric-land-rover-defender-conversion Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 9, 2020 Share Posted July 9, 2020 The two speed tcase will be plenty for an EV. Quote Link to comment Share on other sites More sharing options...
Snagger Posted July 10, 2020 Share Posted July 10, 2020 Yes, as long as the motor is big enough. People using Leaf and other motors of similar capacity are finding they need the full box for off road or towing, as I mentioned. Don Incoll has demonstrated a lot with his Lightweight conversion and showed how even in low range, the motor didn’t have enough torque in third or fourth for steep climbs off road. He also set the motor up to smoothly feed the torque in on pressing down the accelerator, so it doesn’t lurch about or shock load anything. He has it doing regenerative braking, too. Quote Link to comment Share on other sites More sharing options...
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