DougWantsALeaf
Posts: 2193
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Official VW e-Golf thread - $29,815

Tue Mar 10, 2020 3:52 pm

Where can you find the frontal area of the cars?

Coefficient of Drag can be easily found. Niro EV is .3, Leaf is .28, and M3 .22-.23.

What are the frontal areas?
2019 S Plus (98.06% SOH) & 2019 SV Plus (94.77% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh

GRA
Posts: 12387
Joined: Mon Sep 19, 2011 1:49 pm
Location: East side of San Francisco Bay

Re: Official VW e-Golf thread - $29,815

Tue Mar 10, 2020 4:52 pm

One rough and ready method is (width x height) x .85, or you can be more precise by using graph paper: See: https://a2wt.com/AeroInfo.html#:~:text=
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

DougWantsALeaf
Posts: 2193
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Official VW e-Golf thread - $29,815

Tue Mar 10, 2020 7:45 pm

Leaf and Niro are almost identical in height and width. Leaf technically has a better CoD. Both use 17 inch rims. Weight is pretty similar.

Many tests seem to show the EPA difference (215/226 to 239 ..though most tests use the SL, so 215) to understate the range difference between the cars.

The batter is bigger, by about 3.5 kWh from what I can tell from the UDDS tests. That would explain about 12-14 of the 25 miles epa difference.

Either the power mapping help improve efficiency, or the power train just more efficient.

Interestingly enough, Niro (on the car wow test) on a published range vs. actual did much better than the M3 LR. On a proportionate basis, even the Leaf would have out run the M3 SR+, and the Niro got close to the M3 LR.

I know we are off topic. Apologies.
2019 S Plus (98.06% SOH) & 2019 SV Plus (94.77% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh

lorenfb
Posts: 2474
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: Official VW e-Golf thread - $29,815

Tue Mar 10, 2020 7:58 pm

DougWantsALeaf wrote:
Tue Mar 10, 2020 3:52 pm
Where can you find the frontal area of the cars?

Coefficient of Drag can be easily found. Niro EV is .3, Leaf is .28, and M3 .22-.23.

What are the frontal areas?
https://en.wikipedia.org/wiki/Automobil ... oefficient
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F

GRA
Posts: 12387
Joined: Mon Sep 19, 2011 1:49 pm
Location: East side of San Francisco Bay

Re: Official VW e-Golf thread - $29,815

Wed Mar 11, 2020 6:42 pm

The biggest problem with Cd is that unless all the cars are tested in the same tunnel using the same methodology, you can't strictly compare one Cd with another. IIRR C&D did a Cd comparo back awhile (included a Model S IIRC), which did test them all the same, and showed how the Cd can vary from the ones produced by the manufacturers.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

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