Model 3 Efficiency

Discussion in 'Model 3' started by bwilson4web, Dec 8, 2019.

  1. bwilson4web

    bwilson4web Well-Known Member Subscriber

    One of my interests is efficiency, OUTPUT / INPUT, expressed as an efficiency %. So I went to a favorite benchmark road, Brindley Mountain, a 1.1 mi (1.76 km), ~500 ft (~160 m), ~8% grade, South of Tennessee River, Route 231. Waiting for traffic to pass, pull onto the road and stop. Then floor the accelerator to climb the hill; turn around at the top, and; descend on cruise control.


    Less 'frantic' driving, it still reaches the speed limit before anyone else at a light. So this is the first run:
    • Initially the car has reduced power to avoid spinning the tires. But around 60 kph (~37 mph) the full power is not available. Then the full power kicks in, ~140 kW (~188 hp).
    • Full power, climbing efficiency approaches ~98%.
    • To avoid a scary curve at the top, 180 kph (112 mph).
    • On the descent, the ~103% has a slight, ~1%, decrease in efficiency.


    Not used except for benchmarks, included here:
    • Peak power ~220 kW (~295 hp)
    • Peak velocity ~180 kph (112 mph) is also limited by the low banked curve at the top
    • Efficiency ~102% does not make sense unless there is a battery or traction motor power data problem
    • Descending efficiency, ~103% is about 1% less efficient than climbing suggesting the power efficiency is similar to chill mode
    Bob Wilson

Share This Page