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

Re: Speedometer Reads 6% High

Sat Jul 02, 2016 11:52 am

LeafMuranoDriver wrote:
NeilBlanchard wrote:Right, the 17" stock wheels are probably much more accurate. The 16" stock wheels are the ones that are having the much lower accuracy - the speed and the distance registered on the odometer are too high.

Do you have proof of the bold part? I think if there is definitive proof, many that dropped their 4th bar right after 60k miles could show this proof and the car would actually be under 60k miles and qualify for a new battery.


I compared both my GPS and Google Maps against my '15 Leaf S odometer, and it was 2.3% too many miles. This has now changed after we got a software update down a bit.

We used winter tires that are a larger diameter basically the same as the stock 17" tires, and then it was only 0.5% too high.

FireDude
Posts: 4
Joined: Fri Aug 23, 2013 12:20 pm
Delivery Date: 23 Aug 2013
Leaf Number: 311209

Re: Speedometer Reads 6% High

Sun Jun 03, 2018 11:36 am

I know I’m posting on an old subject but it appears to still be a current problem.

My new 2018 Leaf consistantly reads 6% high compared to gps, radar signs and timed miles. I had the same issue with my 2013 Leaf. I own several vehicles and none of the others are off at all.

I suspect there’s more to it than a simple manufacturing error.

First off, electric cars are all about range. Wind resistance increases exponentially with speed and at freeway speed your miles per kilowatt decreases rapidly the faster you go. If your car is saying you’re traveling 65 but in reality you’re only going 60 it makes a difference. Bottom line is Nissan is fudging (lying about) their numbers.

Secondly I lease my car therefore I pay for miles beyond my contract. I will likely go over my miles and that 6% error will equate to 2700 fake miles at the end of my lease for which I will receive a bill for $405

I don’t believe any of this is an accident.

goldbrick
Posts: 201
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Colorado front range

Re: Speedometer Reads 6% High

Mon Jun 04, 2018 10:14 am

The accuracy of the speedometer and odometer will vary based on tire size and even the amount of tire wear, since a worn tire is smaller than a brand new one. I've had many cars from many manufacturers over the last 40 years of driving and I would say every single one showed an actual higher speed than GPS and this started before GPS was widely available.

Car manufacturers need a reliable way to gauge speed and the only sensible way to do that is to measure the speed of rotation of a tire(s) and convert that to speed. They cannot control what tires are on the car so all or nearly all of them show a slightly higher speed than actual. 6% seems a little high but I don't think it is a conspiracy to inflate the efficiency of the car. It's just a small buffer built in for tolerances, different tire brands and sizes and of course, the required legal CYA. If the speedo read low, people would probably try to sue the car mfg's to recover ticket fees, lost time, emotional distress, etc after receiving a speeding ticket...

arnis
Posts: 896
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Speedometer Reads 6% High

Mon Jun 04, 2018 12:37 pm

Speedometer error is coded into the vehicle. This is disgusting EU requirement which is heavily abused by Nissan.
Car actually knows the speed.
Find a place to drive with constant speed for one minute.
Engage cruise control at 100km/h for example.
RESET average speed reading.
Wait 30 seconds. Observe average speed reading WITHOUT changing cruise speed.
Compare to GPS data.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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mgoleta
Posts: 198
Joined: Tue Oct 19, 2010 12:55 am
Delivery Date: 21 Apr 2011
Location: Goleta,CA

Re: Speedometer Reads 6% High

Mon Jun 18, 2018 11:14 pm

In the 's trim ' I just picked up it appears that this it is also off by about 6%. This appears to be the difference between having a 16" (S trim) tire versus a 17" tire (SL,SV trim). Odometer also appears off by same amount. So this may still be a problem. Checking with the dealer.
Glacial Pearl 2011 LEAF SL, QC delivered 4/21/2011, sold 7/22/2018
Chevy Bolt Premiere, 6/4/2018
White 2018 LEAF S, QC, Winter package, 6/14/2018

alozzy
Posts: 1080
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Speedometer Reads 6% High

Mon Jun 18, 2018 11:34 pm

This is a handy online calculator:

https://tiresize.com/speedometer-calibration/

For a 6% correction in circumference on a 2018 S tire, you could switch to 225/60 R16 tires when you replace the stock ones.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
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mgoleta
Posts: 198
Joined: Tue Oct 19, 2010 12:55 am
Delivery Date: 21 Apr 2011
Location: Goleta,CA

Re: Speedometer Reads 6% High

Fri Jun 22, 2018 11:46 am

After talking to my local clueless dealer service (one person asked if I was bringing the car in for an oil change) it was clear that they had no idea what was happening. So I came up with a simple solution that solves 2 problems, speedometer accuracy and the missing large digital speedometer display like in the Gen 1 LEAFs.

Image

An Android phone with the free digHUD speedometer app.
Last edited by mgoleta on Tue Jun 26, 2018 12:10 am, edited 1 time in total.
Glacial Pearl 2011 LEAF SL, QC delivered 4/21/2011, sold 7/22/2018
Chevy Bolt Premiere, 6/4/2018
White 2018 LEAF S, QC, Winter package, 6/14/2018

BlueLectroid
Posts: 5
Joined: Sat Feb 24, 2018 10:31 am
Delivery Date: 24 Feb 2018
Leaf Number: 306785

Re: Speedometer Reads 6% High

Sun Jun 24, 2018 3:18 pm

Our speedometer reads 5% high (63 mph when car is actually going 60 mph). We have another vehicle that has an accurate speedometer to compare to. The dealer was less than concerned - took it on a test drive and said that since the trip odometer (measures in 10ths of miles) showed 1 mile after driving 1 mile (as determined by highway markers), there was no problem. Of course you cannot show a 5% error under these circumstances. Nissan support said to use "taller" tires. The 2017 Leaf S we have behaves as though the speedometer was for a larger wheel size than we have.

There are consequences to this: 1) we lose $400 worth of miles on our lease (5% of 36,000) 2) the range is overstated - perhaps this is Nissan's reason for doing this?? 3) it is annoying to always have to mentally add the 5% when using cruise control.

This was such a heated issue at the dealership that it generated a shouting match in the service area. I have read that the national standard is 4% tolerance, but if there is systematic error (all in one direction) by design, legal issues come into play.

arnis
Posts: 896
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Speedometer Reads 6% High

Mon Jun 25, 2018 6:44 am

Trip meter is actually more precise. Use Waze and cruise control. Set defined speed. Like 60.
Reset average speed data. Observe. It is pretty spot on. Speedo number is not the same as average speed,
even if you never changed the speed :lol:
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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