Page 35 of 35

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

Posted: Tue Mar 10, 2020 3:52 pm
by DougWantsALeaf
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?

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

Posted: Tue Mar 10, 2020 4:52 pm
by GRA
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=

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

Posted: Tue Mar 10, 2020 7:45 pm
by DougWantsALeaf
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.

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

Posted: Tue Mar 10, 2020 7:58 pm
by lorenfb
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

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

Posted: Wed Mar 11, 2020 6:42 pm
by GRA
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.