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Aeromod nissan leaf improved aerodynamics increased range

Posted: Tue Feb 17, 2015 11:14 pm
by Brenthasty
Well the results are in, almost a full 1 mile more per KWH in my Nissan Leaf. Up from an average of 3.9 to 4.8 M/Kwh.

This was achieved by deleting the mud flaps, flipping the mudflaps from side to side and reattaching them in front of the wheels to aeromod and deflect the wind off the cheek of the tires. Along with a partial grille block and licence plate relocation. We placed the licence over the inlet left in the aerodynamic grill block, this serves to shed the wind more cleanly and block direct entrance of particles, bugs, rain ect directly into the grill and radiators. We run the tires at full sidewall pressure 45psi.

These simple improvements to the aerodynamics of the nissan leaf have added 20% in efficiency and range!
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Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Tue Feb 17, 2015 11:49 pm
by EVDrive
Pictures?

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 12:53 am
by Brenthasty
Pics posted here
http://fireplacefurnaces.blogspot.com/2 ... d.html?m=1" onclick="window.open(this.href);return false;

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 3:48 am
by NeilBlanchard
Smooth (clear?) wheel covers would help a lot, too. And a more fully formed Kamm back, as well.

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 10:19 am
by desiv
Looks great..
Do you forsee any issues by not having airflow (cooling) blocking the vents like that?

Also, how much of an effect do you think were the body mods and how much might be the full tire pressure inflation?
(Or were you doing the fill tire pressure before, included in your 3.9 M/Kwh?)

Either way, that looks great!!!
And an extra 20-ish miles in range is pretty nice!!!

desiv

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 11:04 am
by NeilBlanchard
Image
Image

I have not had a chance yet to even see what is cooled with the intake grill - can temperatures be monitored with an OBD II unit?

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 11:46 am
by TomT
The A/C Condenser and the radiator for all the cooling pumps (motor, inverter, charger, etc.) in the car... The temperatures can not be monitored with a conventional OBDII tool. Coolant temperatures are probably on the buss but it would take a specialized tool to monitor them and I don't believe that Leaf Scan Pro has them accessible at this point... I doubt condenser temperature is directly available at all.
NeilBlanchard wrote:I have not had a chance yet to even see what is cooled with the intake grill - can temperatures be monitored with an OBD II unit?

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 11:54 am
by Slow1
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?

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 12:01 pm
by Brenthasty
Through the grill air flows first through the air conditioning core, then through a radiator core that cools these in this order the battery charger then the inverter then the ac drive motor. It is pumped by dual redundant variable speed brushless centrifugal pumps.
The air then flows around the charger inverter ac traction motor; continuing on into a channel between the belly pan around the sealed battery and out just in front of the rear axle; it then mixes with undercar air and is vented underneath and out the back with the trunk aerodynamic ground effects.

Since the ac drive is rated to full power up to 150f and at full freeway speed the coolant is only running 10f above ambient with the partial grille block off, I would love to use what little waste heat is there to defrost windows in winter...

Really only need airflow in the summer if using the ac and pulling a camper trailer....

Re: Aeromod nissan leaf improved aerodynamics increased rang

Posted: Wed Feb 18, 2015 2:33 pm
by NeilBlanchard
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?
It is true - aero drag has a huge effect on the range. At just 30MPH, the aero drag is ~50% of the load on the motor. So, even a few changes that reduce the turbulence caused by moving the car through the air will show up on range.

And you are right that lowering the drag will make the car a better value without increasing the cost. Nissan did some things to lower the drag, but htye certainly could do a lot more.

Nissan could have thermally activated shutters on the cooling air intake. Then you would get lower drag until / unless cooling is needed. In the winter the heat could be harvested by the heat pump, before opening the shutter.