Quote:
Originally Posted by bavarianride
OP's post#1 says 4800lb, which is the curb weight, and that is published data from BMW that does not need BOM nor teardown details.
Focusing the discussion towards weights of floorpan, cowl, front rails, etc. per your definition of platform appears to be missing the point, namely, that hefty 4800lb likely does not help fuel efficiency.
E.g. BMW publishes 300 miles of range for 81.5kWh(usable), or 3.65 miles/kWh.
The i3@3000lb with 30kWh(usable) goes 150 miles, or 5 miles/kWh.
Tesla Model 3 is around 4 miles/KWh, or 26kWh/100 miles per EPA.
So yes, BMW has a dedicated EV platform (i3 with CFRP) that are 20-25% more efficient than Model 3, while BMW's hybrid platform(e.g. i4 ) is not based on published numbers.
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You are correct about the total vehicle weight and that increased weight has an undesirable effect on range. No disagreement there. Part of the i3 effect is the use of CF in the body, beyond the platform. The problem occurred elsewhere on this thread where the versatility of the i4 platform is singled out as the root cause of any additional weight versus comparable models, without any facts of platform weight. Had the discussion focused on total vehicle weight, as you show here, rather than some attempting to single out the platform without knowing actual part weight, it would not have gone so far off the rails.