So BMW uses an electric motor to pull mechanical cables to actuate mechanical parking brakes, combining all of the complication of both mechanical and electric actuation systems, with no benefit other than to replace a lever in the console with a switch? This is why I have no desire to own a BMW!In the meantime I'm playing with electric parking brakes from the BMW X5/X6
First stage of the main battery box fabrication is nearing completion. This steel structure will be welded into place between the main chassis rails providing additional stiffness to the VW chassis and a sealed enclosure for eight Tesla modules
In the current design, is this box replacing any metal at all, or is it added under the floor?Does that box weigh much more than the metal it is replacing?
(follow the link back to this post where there is a drawing)3D mockup of proposed Tesla module layout for the two battery boxes. One box (8 modules) will be mounted under the floor between the chassis rails, and another (6 modules) above the motor where the petrol tank was located
Kevin's earlier report in this thread:How much weight do you expect the bare chassis to increase by and then add with components over the ice setup?
So the net increase is 210 kg and counting, and likely about four hundred kilograms by completion.I spent some time reviewing the weight of the Bus conversion today;
The original bus weighed 1036kg (2285lbs).
Removing the ICE, Gearbox, Fuel Tank, and replacing the front/rear suspension with Red 9 resulted in the bus weighing 852kg (1878lbs).
Installing the Tesla Drive Unit, 4 Tesla Battery Modules and rear battery rack resulted in the bus weighing 1046kg (2306lbs).
Now for another 8 Tesla Battery Modules (200kg / 440lbs), 2 Battery Boxes (TBD), and a bunch of electronics (TBD).
While heavy, it looks as if my 1500kg (3300lbs) kerb weight target is achievable (same as a Nissan Leaf), while leaving 570kg (1250lbs) for payload
I notice in the video they refer to these vents as "Fire Vents".reusing the Tesla Model S/X pressure release valves... two sets at each end of the main battery box
There is an another vent on top of the battery wit a sort of filter in it, I presume that's the one for equalizing pressure.I wonder if they also vent (both ways) to compensate for temperature changes inside the battery casing ?