Opening a new build thread here. After converting a Fiat Spider convertible (haha, such a wordplay), EVs are a way to go for me. Fiat thread: http://www.diyelectriccar.com/forums...der-51822.html
So we are taking one of my other cars (2001 330Ci) and making it high-octane electric. In doing so, we will plan to develop bolt-on designs that can be easily replicated on other E46 bodies.
0-60 below 5 sec. It just HAS to be faster than stock (which is not super-easy to do with a 330...), EDIT: EVcup qualifier is <5 sec 0-60
125 mph top speed. EDIT: EVcup qualifier is >200km/hr top speed
100 mile city range
Configuration options we decided on so far
Battery: 90 CALB 100Ah cells for a 288V nominal 800A peak pack
Controller: 1000A DC (most likely Soliton1 but if I can get 1400A WarpDrive in less than 4 weeks, I'd try it)
Motor: Kostov 11" 250V SFM, with space left for dual 11" setup later.
Charger: our own design (open-source, http://www.diyelectriccar.com/forums...rce-59210.html
) - 10kW, 60A
Drivetrain: not a direct drive (see below)
Coupler/transmission plate: from ElectricCarInternational. Can't beat the price and no design fee. Plus good discounts on subsequent orders of same design.
1. Mechanical drivetrain setup. I definitely want to have a transmission. The question is: do I keep stock manual 5 speed or swap it for one of the automatic sets like http://www.grassrootsev.com/tranadapt.htm
. Benefits are: even higher drive-ability and ability to use idling to belt-drive accessories
2. Accessories. How to best set up heating, AC, power steering, vacuum, etc. In a Fiat, I have ignored all of these - after all, it's a small convertible so braking is fine without assist, heating is a joke anyway with top open, no power steering / AC. In a beemer, all 4 of these will have to work. Now, if you do that in a 'traditional EV DIY' way, that's 4 electric motors and subsystems you have to mount somewhere, etc. Why not keep all the original pumps and pulleys and just mount then on the backplate of the motor and drive all from idle of the main motor (if using automatic tranny) or one small high-voltage DC motor?
3. EV management system choice (or build) - I want a big color screen displaying everything I want about the vehicle at all times. It has to look like a production electric car, without any ammeters on the dash, etc. At this point, the thinking is to build our own system based on Arduino for data gathering and Android tablet for display. If anyone knows any other systems available on the market today, please let me know.
Comments / suggestions?
Let the fun begin! (again...;-)