View Single Post
Old 08-14-2020, 09:30 AM   #6 (permalink)
Engineering first
bwilson4web's Avatar
Join Date: Mar 2009
Location: Huntsville, AL
Posts: 792

14 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

17 Prime Plus - '17 Toyota Prius Prime Plus
90 day: 58.25 mpg (US)
Thanks: 79
Thanked 196 Times in 126 Posts
Here are the first results:
  • Red line diamonds - a baseline recorded in March 2019 from our Std Rng Plus Model 3. It had the stock rims and tires with the aero covers.
  • Green line triangles - recorded August 11, 2020 with 18x8 Enkei trims and 225/55R18 Bridgestone ECOPIA EP422 Plus on the rear. The front tires are the Tire Rack recommended 235/45R18 Michelin Pilot Sport 4.
At lower speeds, the lower rolling resistance tires on the rear are working great. So now I need to look at aerodynamic tricks.

My first thought is rear wheel well pants. I can test it using heavy paper/cardboard and blue sticky tape. I'll only need to replicate the 63 mph benchmark. This approach doesn't add a rotating mass to the wheels.

There are rear spoilers sold but at $700, they are pricy and I'm seeing credible data showing a significant drag reduction. But I can hack-test with heavy paper/cardboard and blue sticky tape.

Bob Wilson
2019 Std. Range Plus Model 3 - 134 MPG3 || 2014 BMW i3-REx - 117 MPGe, 39 MPG
JuiceBox 40 Pro (240 VAC, 40 A), KHONS portable (120-240 VAC, 12-32 A)
Retired engineer, Huntsville, AL (five times AutoPilot saved.)
  Reply With Quote