groingo
Posts: 24
Joined: Sat Mar 04, 2017 2:43 pm
Delivery Date: 04 Mar 2017

2018 Leaf final drive ratio

Thu Sep 28, 2017 11:11 am

The numbers I got from Nissan US were 8.193.....if so this will make a big difference in town and hilly driving combined with the higher h.p. and torque....hope the numbers are true.

armmynissanleaf
Posts: 34
Joined: Wed Feb 05, 2014 7:27 pm
Delivery Date: 05 Feb 2014

Re: 2018 Leaf final drive ratio

Sat Oct 07, 2017 6:44 pm

What number is 8.193?

Thank you
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alozzy
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Re: 2018 Leaf final drive ratio

Sat Oct 07, 2017 10:33 pm

@armmynissanleaf - read the subject line - "final drive ratio"...
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Nubo
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Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: 2018 Leaf final drive ratio

Sat Oct 07, 2017 10:45 pm

armmynissanleaf wrote:What number is 8.193?

Thank you

The motor turns 8.193 times for every revolution of the wheels.
I noticed you're still working with polymers.

BrockWI
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Re: 2018 Leaf final drive ratio

Sun Oct 08, 2017 8:05 am

what is the ratio in the current Leaf?
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JeremyW
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Leaf Number: 19136
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Re: 2018 Leaf final drive ratio

Sun Oct 08, 2017 8:50 pm

Wikipedia (sourcing cars.com) says 2012 leaf was 7.94:1 I don't think Nissan has changed this at all for the 2011-2017 models.

The drive ratio doesn't really tell you much about motor performance on its own...

With a lower ratio you'll have less back EMF at higher speeds, so there's some efficiency gains to lowering the ratio.
With a higher ratio you'll have better low speed performance.
Both of these things are generalities. You can work around back EMF with some control techniques, you can beef up the stator windings to make motors have better low speed performance. It really comes down to how Nissan designed the inverter, what the allowed maximum torque is at all speeds, throttle response at 0, etc. I'm sure it's quite good.

As an example where drive ratio doesn't fit your metrics: I've broken traction in a Spark EV with sticky aftermarket tires when accelerating from 30 mph. It has a final drive ratio of 3.87 :shock:
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