I am not Wayne, but I can give you two data points on automatics: - I find myself driving very often in kick-down, meaning having the accelerator pedal to the floor. This does not add more inverter power, since the actual input of for the inverter is handled in a rather small area of the accelerator, but it is to keep the transmission in lower gear because the upshift happens too early to get good acceleration: it upshifts before reaching a decent RPM, keeping it in kickdown allows the RPMs to go almost twice as high before finally forcing the upshift. With normal pedal positions, the upshift from 1st to 2nd happens at 15MPH and the upshift to 3rd is so low that I can't even detect it. With kick-down, first gear takes me up to 26 MPH and it stays in 2nd until just over 45 MPH, which gives me a somewhat decent acceleration for my severely underpowered vehicle (30kW for a 4000lbs truck)
- the consumption in my truck is much higher than another conversoin of the same vehicle (89 Ford Ranger) with manual gears that I looked at last year. That vehicle has 40 miles range while my truck, with the same battery pack, can do 25 miles. When I get back from a longer drive and see how the transmission has heated up nicely, I know where the energy has gone that I lost. I prefer the transmission stays cool and sends the power to the wheels, but the automatic eats almost half the power. YMMV Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Barry Oppenheim via EV Sent: Monday, December 01, 2014 9:20 AM To: 'Electric Vehicle Discussion List' Subject: Re: [EVDL] Converting with an Automatic Transmission Wayne wrote: "I built a lot of automatic conversions, its no big thing..." Wayne, Couple questions on your response. You mentioned that you have experimented with different torque converters and generally keep the stock TC. Can you elaborate on how automatic shifting performs given the torque curve on electric motors is different than the ICE torque curve? How do you determine what parameters (RPM/gear) to use when adjusting the shift points electronically with an aftermarket computer? Have you tried without an idling circuit/EVTronics controller (just manually idling, with brake applied, in order to build up pump pressure)? When using a stock transmission and TC how does the vehicle perform using manual shifting of the automatic? Thoughts on lockup vs non-lockup converters? Thanks in advance, Barry _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
