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TomT
Posts: 10648
Joined: Sun Aug 08, 2010 12:09 pm
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Leaf Number: 000360
Location: California, now Georgia
Contact: Website

Re: Aeromod nissan leaf improved aerodynamics increased rang

Wed Feb 18, 2015 2:47 pm

I think that a more detailed and controlled test is necessary... I find it hard to believe that these two simple mods would result in a 20% improvement... Granted, the Leaf actually has fairly poor aerodynamics as shown by Car and Driver's test, but still...
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

ydnas7
Posts: 590
Joined: Tue Sep 27, 2011 8:57 am

Re: Aeromod nissan leaf improved aerodynamics increased rang

Wed Feb 18, 2015 8:46 pm

Slow1 wrote:I have to say I'm rather stunned. Seems like very simple modifications - I wonder why Nissan doesn't apply the same approach? Seems a LOT less expensive compared to added battery capacity to increase range by 20%.

What am I missing here?
Its not part of the Nissan's earlier B platform, probably is part of Nissan's V platform

Notice how efficient the Nissan Altima is for highway cruising compared to the significantly smaller engined Nissan Sentra? (which itself is a frugal car)

Sentra and LEAF were optimized for cost effective city use. There is still further they could claw back for highway range, but LOOKS are important.

lorenfb
Posts: 2426
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: Aeromod nissan leaf improved aerodynamics increased rang

Wed Feb 18, 2015 9:10 pm

TomT wrote:I think that a more detailed and controlled test is necessary... I find it hard to believe that these two simple mods would result in a 20% improvement... Granted, the Leaf actually has fairly poor aerodynamics as shown by Car and Driver's test, but still...
That's one of the more realistic views, i.e. 20% is significant based on an assumed Cd improvement
from somewhat minor body changes.
#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

Brenthasty
Posts: 60
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Leaf Number: 023724
Location: Near portland oregon
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Re: Aeromod nissan leaf improved aerodynamics increased rang

Wed Feb 18, 2015 9:52 pm

We have been running 45 psi since November so it is included in the 3.9 miles per kwh average

lorenfb
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Joined: Tue Dec 17, 2013 10:53 pm
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Leaf Number: 416635
Location: SoCal

Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 9:08 am

Brenthasty wrote:We have been running 45 psi since November so it is included in the 3.9 miles per kwh average
Remember there are basically two components to energy loss:

Energy Loss = Rolling Resistance Loss + Drag Resistance Loss

So if the claim of an overall 20% gain in efficiency was achieved, then the drag component improvement
was even more significant.
#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

Slow1
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Leaf Number: 425010
Location: Eastern MA, USA

Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 10:47 am

So there were two things done - one was the mud flaps and the other blocking off the grill? Mudflaps seem to be a significant commitment - perhaps just dong the grill would make a difference and is worth trying. That seems to be a (reversible) change that even simple folks like myself could do....
2013 S with 6kw upgrade (Black)
MFD Date 12/13

Brenthasty
Posts: 60
Joined: Tue Dec 23, 2014 6:24 pm
Delivery Date: 13 Nov 2014
Leaf Number: 023724
Location: Near portland oregon
Contact: Website

Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 11:08 am

The mudflaps are two separate factors

First in thier factory position they cup into the wind, think of attaching 4 pieplates to the roof against the wind.
I think the greatest gain in aero is thier removal; which is just one bolt and 2 screws each, takes less than 30 min....

Secondly thier re attachment in front of the tures, there they serve to slipstream a part of the tire that hit the wind squarely. In thier reattachment they use factory bolt points, only 2 screw holes needed to be added each. Again 30 min...

All and all I would equate this two step mudflap dance to about the removal of 6 pie plates of wind resistance!

Brenthasty
Posts: 60
Joined: Tue Dec 23, 2014 6:24 pm
Delivery Date: 13 Nov 2014
Leaf Number: 023724
Location: Near portland oregon
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Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 3:08 pm

Double up those results same route different driver 4.7m/kwh

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jlv
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Leaf Number: 424487
Location: Massachusetts

Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 3:21 pm

TomT wrote:I think that a more detailed and controlled test is necessary... I find it hard to believe that these two simple mods would result in a 20% improvement... Granted, the Leaf actually has fairly poor aerodynamics as shown by Car and Driver's test, but still...
That was my thought. A back-to-back test of the modified vehicle vs. a stock vehicle would be interesting. I can imagine a number of variables that could affect the comparison of values from today vs. values from some point in the past.
LEAF '13 SL+Prem (mfg 12/13, leased 4/14, bought 5/17, sold 11/18) 34K mi, AHr 58, SOH 87%
Tesla S 75D (3/17)
Tesla X 100D (12/18)
93K 100% BEV miles since '14
ICE free since '18

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TonyWilliams
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Joined: Sat Feb 19, 2011 1:48 am
Location: San Diego
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Re: Aeromod nissan leaf improved aerodynamics increased rang

Thu Feb 19, 2015 3:26 pm

TomT wrote:I think that a more detailed and controlled test is necessary... I find it hard to believe that these two simple mods would result in a 20% improvement... Granted, the Leaf actually has fairly poor aerodynamics as shown by Car and Driver's test, but still...
If this car is in SoCal, I'm happy to participate in a detailed range test.

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