minispeed
Posts: 681
Joined: Sun Jul 06, 2014 4:52 am
Delivery Date: 15 Jul 2014
Location: Ancaster, ON

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sat Feb 21, 2015 6:35 pm

I know of one other leaf owner with a 2011 that has had a 100% grill blocked in the winter without trouble. I never got around to doing mine before the winter and since I haven't run into a problem making my round trip with a brand new 2015 I put it off to the spring.

As many people have touched on before the opening is designed for all conditions. Nissan has to make it big enough to cool a car going through death valley on the hottest day in July with 5 adults in it at 80 mph and stock PSI inflated tires with the AC going full blast. Once you factor in your unique conditions there is a lot of the grill most drivers can block off. Less energy needed to move the car down the road also means less load on the car which means less need for cooling. If you run max sidewall PSI LRR tires keep it under 60 mph and don't crank the AC then every single car grill opening out there is overkill for you. As far as the heat pump goes a grill block probably makes it more efficient allowing the ambient air under the hood to be warmer and instead of bleeding that heat to the outside air you can harvest it through the heat pump.

ICE drivers have been doing partial (75-90%) and full grill blocks for years without major issues. I ran a full block for winter and 80-90% for summer on my insight, prius, optima and miata (didn't run the winter with that one though). A good test is to wire up a little LED to the cars fan. If something gets hotter than the car likes then the car will turn the electric fan on in an attempt to aid cooling. At this point you see the LED go on which means you should probably open up the grill a bit.

I'm interested in trying the mud flaps as I removed mine the week I got the car. Not too crazy about the screws through the side though. I think some good 3M tape and screws into the inner liner should hold it.


Here are some fun tools I've used to find out what can be done with the leaf for aerodynamics.

http://ecomodder.com/forum/tool-aero-ro ... stance.php

I used the numbers from car and driver and the drag queen test, 3353 lbs, .32 cd and 24.5 frontal area. Engine and drivetrain efficiency and parastatic overhead are for MPG, they don't affect the rolling and aero HP. http://www.caranddriver.com/features/dr ... ecs-page-7

At 70 mph the calculator gets the same results as the car and driver test, 18 hp aero. At a more useful to us 60 mph it's 11.54. If we could get the car down to a prius like 0.26 at 60 it would be 9.38. or 18.7% less HP needed.

I used 0.01 for the rolling resistance based on this http://en.wikipedia.org/wiki/Rolling_resistance. It's no surprise that LRR would give you much better results than aero for people who keep the speeds under 35 mph. A 20% decrease in rolling resistance as quoted by many tires would only give you about 6.3% less hp needed at 60 mph.
2015 White SV, after one month 292 GIDS
Best 1 charge drive, 229km (143miles)

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

Sat Feb 21, 2015 7:58 pm

We made the wheel discs out of 16" pizza pans $3 each, more images and details in our blog

LeftieBiker
Moderator
Posts: 14874
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sat Feb 21, 2015 9:34 pm

Nissan has to make it big enough to cool a car going through death valley on the hottest day in July with 5 adults in it at 80 mph and stock PSI inflated tires with the AC going full blast.
Make that 15MPH for maximum cooling needed. At 80 the air would find its way into the motor compartment anyway.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DesertSprings
Posts: 158
Joined: Wed Dec 03, 2014 4:40 pm
Delivery Date: 21 Dec 2014
Leaf Number: 319100
Location: Southern California

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sun Feb 22, 2015 12:10 am

Brenthasty wrote:We made the wheel discs out of 16" pizza pans $3 each, more images and details in our blog
You should add a link to your blog from your signature to make it easier for people to find.

NeilBlanchard
Posts: 619
Joined: Sat Oct 11, 2014 5:02 pm
Delivery Date: 14 Oct 2014
Leaf Number: 306278

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sun Feb 22, 2015 5:50 am

Looks great to me! Please keep us posted on the efficiency changes.

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You drilled into the spokes, and used self-tapping screws to hold them in place? Wow, you are going full monty!

Nissan needs to tighten up the wheel openings - this could lower the Cd another 0.01+.

BrockWI
Posts: 830
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sun Feb 22, 2015 5:56 pm

On the Leaf I have our grill blocked with black gaffers tape, it is similar to duct take, but doesn't leave a residue when you take it off and is more flexible, more cloth like. It is commonly used in theater and production applications. I haven't noticed anything any more warm, but then again it was -2F for a high yesterday and -16F when I left work at midnight, the dash battery is usually between 1 and 3 bars. I can't say I have noticed any better areo from it, but it is cold, snowy and I have the snows on as well. If your not up close you would never know it is on there and it is easy to take off in the spring as well. I did it to hopefully keep the engine bay a bit warmer, can't hurt in winter anyway.

Image
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@100k miles - 57.3Ahr - 87.62SOH - 84.13Hx - 241GID
3.3 kw solar pv - XW6048 - eight L16's
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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

Sun Mar 01, 2015 10:01 am

Trailered 1 tone of hay home for the horses yesterday with our nissan leaf. Pulled it better than a toyota truck! Surprized at how little it dropped the range on the 30 mile haul! I was expecting more like a 50% drop, it was closer to 20....

GetOffYourGas
Posts: 2084
Joined: Tue Dec 20, 2011 6:56 pm
Delivery Date: 09 Mar 2012
Location: Syracuse, NY

Re: Aeromod nissan leaf improved aerodynamics increased rang

Sun Mar 01, 2015 6:58 pm

Brenthasty wrote:Trailered 1 tone of hay home for the horses yesterday with our nissan leaf. Pulled it better than a toyota truck! Surprized at how little it dropped the range on the 30 mile haul! I was expecting more like a 50% drop, it was closer to 20....

Wow, that's awesome! I've been toying with the idea of installing a hitch to tow my sunfish sailboat. Maybe if spring ever comes, I'll bite the bullet this year. Mind sharing what hitch you installed?
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

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

Mon Mar 02, 2015 9:20 am

I went with a curt direct fit complete hitch kit with direct plug wire harness and fitted hitch sstinger with 4" rise
Ill start a new thread about pulling...

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 Mar 05, 2015 11:59 pm

Aeromodded Nissan Leaf pulling a 3 point tractor scraper box on a utility trailer. Getting 3.6 mi/kwh 122 mpg @60 mph over a 100 mile average.

Leaf pulling a empty utility trailer. Getting 4.1 mi/kwh 138 mpge @60 mph over a 100 mile average.

Aeromoded nissan leaf gets 162 mpg with improved aerodynamics

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