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Old 02-11-2021, 02:38 PM   #1 (permalink)
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VW ID3 aerodynamics

I will soon get my own first eletric car and it will be the VW ID3
Frontal area is 2,36m2 and announced drag coefficient Cd 0,267.

Cars oem tire size is 215/55R18 which is not super wide, but still not super narrow either.

Car is already pretty energy efficient, but ofcourse there is room for improvements as the drag is 0,267 which in my mind is pretty high.

Testing and changing will begin from tires. I already have bougth BMW I8 20" aerowheels and 195/55R20 Nokian Hakkapeliitta R2 winter tires which have A rolling resistance mark. Those wheels are almost fully closed.

I also have the 155/70R19 wheels and tires from A8 project, but for those I have only summer tires at the moment. But surely I will test also those when weather gets better. Will try also with wider wheels at rear like they are in the I3. Specs on these vehicles are pretty close as
BMW I3 CdA 0,714 vs VW ID3 0,63 The bmw is 400kg lighter so it consumes little less energy at lower speeds about 10% . But when speeds go to 140km/h difference is only under 4%.

Roofline of the ID3 matches perfectly the ASTII template so the bad aerodynamics come from wheels and underside of the car as the front already has a active grill block on all models. Will look closer is it full grill block or not when I get the car.

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Old 02-11-2021, 05:38 PM   #2 (permalink)
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Wheels tires and underbody? Is that why they call it low-hanging fruit?
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Old 02-12-2021, 12:37 PM   #3 (permalink)
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ID3

Just looked at it online.
* L= 4261mm
* W= 1809mm
* H= 1552mm
* L/H= 2.745
* L/W= 2.355
* Cd 0.267
* Af= 2.36 m-sq
* CdA= 0.63012 m-sq
--------------------------------------------------------------------------
* There's a 4-view Blueprint of it available online
* Lower rear quarters have little plan-view camber
* Beltline has healthy plan-view camber
* Roofline has healthy plan-view camber
* Tumblehome is healthy
--------------------------------------------------------------------------
* Tighter front wheel arch gaps might be possible
* 'Tesla', long-strut mirrors might knock 0.005 off the Cd
* Rear skirts would be a setup for some later tail extension
* No view yet of underbody, so it remains an unknown quantity
--------------------------------------------------------------------------
* Creating a perfectly-vertical, Kamm-truncated box-cavity, to take advantage of every existing millimeter of body length, would be a logical setup for a later boat-tail elongation ( that's where any significant drag reduction would come from )
--------------------------------------------------------------------------
* The Blueprint side elevation would allow us to accurately locate the roof apex, and that would allow us to quantify the starting Verjungsgungverhaltnis ratio, to compare to bodies of known lower drag, from which one might more accurately predict a drag outcome from a specific degree of elongation.
* She looks like a great canvas from which to paint a masterpiece!
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Last edited by aerohead; 02-12-2021 at 01:31 PM.. Reason: typo
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Old 02-12-2021, 01:41 PM   #4 (permalink)
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Join Date: Jan 2009
Location: Kitee (Finland)
Posts: 1,024

Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
Diesel
90 day: 104.94 mpg (US)

A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual
90 day: 64.64 mpg (US)

Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L
90 day: 54.57 mpg (US)

Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual
90 day: 32.98 mpg (US)

A2 1.4TDI - '03 Audi A2 1.4 TDI
90 day: 45.68 mpg (US)

A2 1.4 LPG - '02 Audi A2 1.4 (75hp)
90 day: 27.48 mpg (US)
Thanks: 206
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I have thinked about the boattail. The oem spoiler has good angles so I just need to make it longer with clear 0,5mm thick plastic sheets.

What I have read the door mirrors like they have in the ID3 should be better than the long arm a corner piece mirrors.

Underside is pretty smooth due to battery, but around the a struts and before wheels you can do something.

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Tags
aerodynamics, energy consumption, id3, lower drag, range improvements

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