Hi Jack, I just ran some numbers, and I think it is important to realize that you are essentially talking Tesla P85 or P85D levels of performance. I wasn't sure what Corvette you were talking about, so I chose a relatively high end, but stock model. I used the Z06 as an example.
The Z06 is about 3500 pounds stock. As a high performance EV, it will probably gain about 500 pounds, so a total weight of 4000 pounds. The Z06 has a 0-60 time of 2.95 seconds and a quarter mile time of 10.95 seconds. You will need power similar to the 650 hp of the stock Corvette. The Tesla P85D has over 700 hp for 4600 pounds, so in the ball park. That 650 hp is about 485 kW. With a battery voltage of 400V, you need 1200 amps from your batteries, through the controller, and into your motor(s). That is serious power! That is high end Tesla or high end drag racer territory. Systems like the Leaf just don't have the power you need. The Leaf system, for example, is only 107 hp or 79 kW. Most batteries don't have the energy density to provide that kind of current and power. The small format cells used by Tesla have much higher current capability than most EV cells. Another point: While you might not need the Tesla range, a significantly smaller battery might not be able to provide the same power levels. Larger battery packs can provide more power than smaller packs. Finally, you need to figure out where to put all the cells in a body that doesn't have much space. Ideally, for best handling, you would like to get them in the floor. That lowers the center of gravity. It might help with space issues too. Personally, I would be looking at Tesla parts, rather than Leaf parts. They are a much better match with your needs. If using Leaf motors, you might need 3 or 4 motors. However, the Leaf battery can't provide the necessary power. Finally, I can't resist a comment about your business plan. I can't really comment on how well the plan will work with the target market, since that is so far outside my experience. I am an engineer (with a Tesla P85 and a home conversion), and don't have any concept of vehicles as fashion accessories. However, I do know that you aren't the only person with that target market in mind. There aren't that many people that can drop that kind of money, so you have to find some way to stand out from the others trying to market to the same few. Are any of your advisors investing their own money in the project? That is one way to judge their confidence in their advice. Mike P.S. The Tesla Model S P85D with ludicrous mode would still beat the Z06 in 0-60 and quarter mile times. Sorry, I couldn't resist 8>). On January 14, 2016 1:04:31 PM MST, Jack Wendel via EV <[email protected]> wrote: >Wow Lee, thanks for all the info! It let me know that DC motors aren't >as >"bad" as I was led to believe. > >I am a professional Agile/Lean software development coach. Our motto is >"Fail fast and learn". This means it is better to do something wrong >and >learn what you can from it as quickly as possible than to spend >excessive >time in planning for a "perfect" solution and end up with nothing but >documents. > >I think of my prototype car as a "EV minibike" or "EV gocart" that >someone >suggested as a starter project for learning. My "EV gocart" just >happens to >be a lot bigger. > >"DC is not flashy and high-tech enough for an expensive luxury sports >car. >You want cutting-edge style, you want flash and glamor; you want to >make a >statement." > >Exactly why my production car will be AC and have regenerative braking. >The >prototype will not have either of these because they provide minimal >increase in utility (real value to me) relative to the significant >increase >in cost and complexity. > >The goals for my "oversize EV gocart" are: > >1) Make passes down a dragstrip and be quicker than a stock Corvette >(as >good or better than a "performance ICE"). >2) Be able to provide "short test rides" to people at various events >and >shows (let others experience EV acceleration. Charging intermittently >is >acceptable). >3) Be able to drive indoors with no ventilation (not practical with an >ICE). >4) Be able for me to drive back and forth to work (12.6 miles each way. >Allows me to claim "daily driver" and gain daily exposure, free >advertising, on the road). > >Obviously it would be great to exceed these but if I can meet all of >these >I will consider my prototype car a success. >-------------- next part -------------- >An HTML attachment was scrubbed... >URL: ><http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160114/e199d879/attachment.htm> >_______________________________________________ >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >http://lists.evdl.org/listinfo.cgi/ev-evdl.org >Read EVAngel's EV News at http://evdl.org/evln/ >Please discuss EV drag racing at 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
