ronbot wrote: ↑
Sun Jun 09, 2019 5:54 pm
Time to start saving my money and making plans to buy a couple of BMW-family wrecked cars to "glue together".
Why not just work with what's already available from wrecked i3's?
It doesn't seem like a crazy amount of CNC time to cut a few billets into front steering uprights with hub holes for the driveshafts:
Getting the front i3 motor to sit low enough in the existing frame to have the driveshafts level at rest may be an issue, and I'm guessing that the battery pack isn't going to like being discharged at twice the designed rate feeding two motors with a lead foot.
I suspect that BMW's choice of narrow wheels and tight fenders makes retrofitting hub-based electric motors on the front wheels into a bigger challenge than it needs to be. Factoring in the weight shift to the rear wheels on launch, smaller hub-based electric motors would probably be practical for an AWD retrofit (assuming unsprung weight is not a concern).
In case you've never seen weight transfer in stop motion, here's a 5,000 RPM clutch pedal side-step launch of my AWD race car caught by an event photographer. Notice how the rear wheel and suspension is squatting and cambered in, while the front suspension and wheel are really light:
I think that a 50/50 split of power is a waste on an AWD car...at least for maximum acceleration applications.....