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garygid
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Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Performance - Max Grade Climbing

Mon May 30, 2011 6:53 am

With the LEAF over 3300 pounds,
the maximum torque listed at 209 foot-pounds,
and the wheel & tire radius at about 1 foot:

209 ft-lbs / 1 foot = 209 lbs maximum "push".
209 lbs / 3300 lbs = about 0.063, or just a little over a 6% grade.

So, is the LEAF's MAXIMUM constant-speed grade-climbing
ability something under a 7% grade?

Others talk about going up "mountains" or hills with an 8% grade.

What am I missing?
Thanks, Gary
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MikeD
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Joined: Thu Jun 24, 2010 6:14 am
Delivery Date: 12 May 2011
Leaf Number: 592

Re: Performance - Max Grade Climbing

Mon May 30, 2011 7:09 am

Two drive wheels?

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EVDRIVER
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Re: Performance - Max Grade Climbing

Mon May 30, 2011 7:33 am

I believe that is the motor spec, there is the torque multiplication of the transfer case. The LEAF can climb very steep grades I can assure you, and any hill in SF at very high speed and those make 8% grades look easy. IF the motor were only connected to the wheels there would be an issue.

palmermd
Posts: 2612
Joined: Fri Apr 23, 2010 3:19 pm
Delivery Date: 31 Mar 2011
Leaf Number: 1100011011
Location: Hermosa Beach, CA

Re: Performance - Max Grade Climbing

Mon May 30, 2011 7:45 am

I'd guess a 7 or 8 to 1 gearbox, so that would make it at least a 50% grade constant speed.
Michael

Leaf from 31 March 2011 - Traded 18 April 2018 for Tesla Model 3 Unicorn
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TomT
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Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: California, now Georgia
Contact: Website

Re: Performance - Max Grade Climbing

Mon May 30, 2011 8:02 am

7.9377 to be exact...

palmermd wrote:I'd guess a 7 or 8 to 1 gearbox, so that would make it at least a 50% grade constant speed.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
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hill
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Posts: 1870
Joined: Wed Apr 21, 2010 4:05 pm
Delivery Date: 27 Mar 2011
Leaf Number: 0659
Location: Lake Forest, CA

Re: Performance - Max Grade Climbing

Mon May 30, 2011 9:20 am

garygid wrote:With the LEAF over 3300 pounds,
the maximum torque listed at 209 foot-pounds,
and the wheel & tire radius at about 1 foot:

209 ft-lbs / 1 foot = 209 lbs maximum "push".
209 lbs / 3300 lbs = about 0.063, or just a little over a 6% grade.

So, is the LEAF's MAXIMUM constant-speed grade-climbing
ability something under a 7% grade?

Others talk about going up "mountains" or hills with an 8% grade.

What am I missing?
Thanks, Gary
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TonyWilliams
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Re: Performance - Max Grade Climbing

Mon May 30, 2011 9:34 am

We were playing around with how fast the LEAF would go up a hill near our house (and how much regen down the hill).

With 2 1/2 people, ISA plus 5C at near sea level, max speed up the hill was 82.

Max regen down the hill was about 15kw at 45mph, and about 22kw at 60mph, both in ECO mode. Obviously, hitting the brake pedal can max out either to 30kw.

So, towing your LEAF with a motor home for about an hour at 60mph will fully charge the battery.

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TomT
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Re: Performance - Max Grade Climbing

Mon May 30, 2011 9:42 am

That assumes that it would continue regening at that level for the entire hour, which I doubt. Likely it would taper off quickly to a much lower value... Regardless, it is an inefficient (and likely unsafe) way to charge.
TonyWilliams wrote:So, towing your LEAF with a motor home for about an hour at 60mph will fully charge the battery.
Last edited by TomT on Mon May 30, 2011 11:25 am, edited 2 times in total.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
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JohnnySebring
Posts: 110
Joined: Tue Apr 26, 2011 10:13 am
Delivery Date: 10 May 2011
Leaf Number: 0457
Location: Seattle, WA

Re: Performance - Max Grade Climbing

Mon May 30, 2011 9:43 am

I live in a very hilly area of Seattle, 98199. Dravus street is very steep grade and my Leaf climbs it like a rocket. I have to lift the petal to not catch air at the cross streets. Starting from a dead stop on the hill is easy and smooth. This is the route I take when giving demo rides to friends and neighbors. They are always amazed and realize that this isn't a golf cart. They know what their ICE car does on the hills, all the down shifting, noise and rotten egg exhaust smell from the catalytic converters and appreciate the difference. The Leaf is awesome in this urban environment! :D :D :D

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TonyWilliams
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Re: Performance - Max Grade Climbing

Mon May 30, 2011 9:45 am

mogur wrote:That assumes that it would continue regening at that level for the entire hour, which I doubt. Regardless, it is an inefficient (and likely unsafe) way to charge.

[quote="TonyWilliams"So, towing your LEAF with a motor home for about an hour at 60mph will fully charge the battery.
[/quote]


Neither of us know whether it will continue for an hour or not. It's not likely that it would matter if it was an hour, or 90 minutes. It is fast, I think we can agree.

The efficiency is TIME. If I'm towing the LEAF anyway, and would like to use it at my next RV destination 90 minutes away, it is absolutely efficient.

Please expand on the "unsafe" part. If it's unsafe for regen, then I need to sell my car now.

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