I thought that torque was calculated/measured at the wheels and to get the highest number, it is typically in 1st gear, so I would not expect that they can break tires loose on a dragstrip if they launch in 4th gear even with a standard diff, let alone with 1:1 diff, because I expect that torque was measured in 1st gear, no?
100 MPH is 44.7 meters per second, with tires that are 24" dia (61cm) the RPM of the wheels is 1400 at 100MPH, you would not want to gear your car to have the motor lugging that low at 100MPH! (unless you are actually doing a speed closer to 1000MPH) Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Ben Goren via EV Sent: Wednesday, May 13, 2015 10:16 AM To: brucedp5; Electric Vehicle Discussion List Subject: Re: [EVDL] EVLN: UK's 1000hp 1975 Electric Enfield (v) On May 13, 2015, at 12:12 AM, brucedp5 via EV <[email protected]> wrote: > Later in the weekend, the team turned up the wick and the car sprinted > through the quarter mile in 12.56 seconds at 101.43 mph. Quite respectable in and of itself, and most impressive in a car that started life as the antithesis of fast! > The batteries pack delivers 370 volts, 600 kilowatts, more than 2000 > amps, 1003hp, and 1200 lb-ft of torque - all while weighing less than 360 > lbs. 370 V * 2000 A = 740 kW, not 600 kW, and that's going to work out to be much closer to about the same numeric value for horsepower rather than 1003, so something isn't adding up. Very lightweight, though, for that much power. Be nice to know the Ah / kWh capacity...and the source and price.... Regardless, in a vehicle that weighs under 2,000 pounds, he's got waaaaaay more power than he'll ever actually be able to put to the ground -- exactly the kind of problem you want in drag racing. Just taking that 1200 lb-ft of torque at face value...that's well over half the weight of the car, meaning that, assuming tires roughly 24" in diameter (give or take), even with no gear reduction (fourth gear equivalent and a 1:1 rear differential) he can _still_ break the tires loose. Insane! His big challenge is traction, including weight and balance management (especially getting the weight to shift to the rear axle without going over backwards) since he's not likely to be able to do much more with the tires. Seems like a really fun project, and I bet it's even more fun to drive! b& _______________________________________________ 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)
