Quote:
Originally Posted by Phase
Do you think engineering explained had credibility?
https://youtu.be/NYvKxsYFqO8?si=4L4M45SEzCVrZW_H
Skip to 7:30 in the video. He straight up states that Tesla itself has different ranges submitted legally for each tire size at a STEADY STATE speed also.
Explain that too, regardless of your beef with Wayne |
Wow!, that's an old one.
From Jason's data:
1) The tire circumferences are essentially the same, so, fundamentally, either size tire's sidewalls and tread blocks are deforming at equal surface-feet-per-minute rates. Only a difference in tire construction could explain a difference in R-R.
2) All-season radials have the lowest R-R of all tires.
3) Touring tires have the next-best R-R characteristics.
4) High-performance tires have the worst R-R. The lower aspect-ratio, larger wheel tires may be high-performance, hence, higher R-R.
5) 'Wider' tires would increase frontal area, at a fixed ground clearance. Jason never specifies if this 'condition' exists with the Tesla 3 tires. So it remains an unknown quantity.
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6)Rob Palin, aerodynamicist for all Tesla Vehicles, excepting the original Lotus Elise-based Roadster-I, tested Tesla's different Wheel/tire combos in Germany on the Autobahn, at up to 141-mph ( 247-km/h ) in 2018, and reported his findings @ 'Tesla Model 3 Aerowheels', at electrek.co.
7) Mechanical efficiency varied by 10%.
8) Range varied by 5%.
9) Cd varied from zero at low-speed, to 3% @ top speed.
10) Bjorn Nyland did the same thing, at posted speed on the Interstate, from Tesla's Hawthorne, California offices, with a Dual-Motor, Long Range Model 3.
11) He saw a delta-10% difference in efficiency also.
12) Range in energy consumption between, 186-Wh/Mi, and 179-Wh/mi, Delta-3.9%.
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This tire issue involves a multivariate problem involving the simultaneous solution for both linear, and non-linear equations, which even with a Masters Degree in Mechanical Engineering, Jason shied away from.
And we never actually learn from the video what 'mechanism' is attributed to the explanation for the difference in Tesla's submitted EPA documentation, only 'hypotheticals.'
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So, on to the 2024 Prius...................................