dhanson865
Moderator
Posts: 1493
Joined: Wed May 25, 2011 7:12 am
Leaf Number: 16156
Location: Tennessee

Re: Speedometer Reads 6% High

Sun Jun 26, 2016 8:14 am

bowthom wrote:Hello,
According to mfr specs and DOT regs a speedo error range must be +2.5/-0, so all speedos read fast when delivered.


They all read fast but you need to site a source or I'm going to disagree.

https://www.fmcsa.dot.gov/regulations/t ... ion/393.82 says "Each bus, truck, and truck-tractor must be equipped with a speedometer indicating vehicle speed in miles per hour and/or kilometers per hour. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph)." which is +10%/-10%

http://standards.sae.org/j1226_201108/ SAE J1226 "To begin with, manufacturers are afforded the latitude to aim for within plus-or-minus two percent of absolute accuracy or to introduce bias to read high on a sliding scale of from minus-one to plus-three percent at low speeds to zero to plus-four percent above 55 mph. And those percentages are not of actual speed but rather a percentage of the total speed range indicated on the dial. So the four-percent allowable range on an 85-mph speedometer is 3.4 mph, and the acceptable range on a 150-mph speedometer is 6.0 mph."

http://www.unece.org/fileadmin/DAM/tran ... 039r1e.pdf UN ECE Regulation 39 says : "no speedometer can read slower than the actual speed. Ever. On the high side, it’s allowed to read up to 10% above the actual speed plus four or six kilometers per hour, depending on the type of vehicle." So this one can be 0%/+10%.

And since the manufacturers don't like to do much customization per market they often just let them ride in the +3% to +8% zone for so they have plenty of margin for error.

So yeah I'll go with "all speedos read fast when delivered" but I don't agree with your +/-.
Blue 2012 Leaf 195/65/15 tires, 15" Rims
Silver 2012 Leaf 16" stock wheels
wiki/index.php?title=Real_World_Battery_Capacity_Loss
(efficiency 3.x KW vs 6.x KW)
please join Truedelta.com and input your repairs.

PianoAl
Posts: 222
Joined: Mon May 16, 2016 4:15 pm
Delivery Date: 20 May 2016

Re: Speedometer Reads 6% High

Sun Jun 26, 2016 8:27 am

So, no way to calibrate it in my 2016 LEAF Model S?
2016 Nissan LEAF Model S, Purchased May 2016

dhanson865
Moderator
Posts: 1493
Joined: Wed May 25, 2011 7:12 am
Leaf Number: 16156
Location: Tennessee

Re: Speedometer Reads 6% High

Sun Jun 26, 2016 8:31 am

PianoAl wrote:So, no way to calibrate it in my 2016 LEAF Model S?


As I said above. The dealer might be able to adjust it -2.5% using their tools. Past that you'll have to buy different sized tires.

Pck a tire with a RPM nearest to 815 revs per mile or 25.5" diameter. Doesn't have to match the OEM tire sizes just pick the size that matches the RPM/diameter.

Ideally if you care about range you'll also get rid of the steel rims that come with the S and get 15" alloy rims that weigh around 15 pounds per.

196/65/15 is similar to your current inaccuracy but will increase range.
205/65/15 will reduce speedometer by about 2%

205/60/16 is also good for about -2%

I'd avoid going further than a 3% reduction by tire size due to the lack of variety/sizes of narrow tires with high diameters preventing us from getting larger diameters in narrow tires. It's also not a bad idea to just to stop with a mild correction so you don't have to worry about clearance/rub issues.
Blue 2012 Leaf 195/65/15 tires, 15" Rims
Silver 2012 Leaf 16" stock wheels
wiki/index.php?title=Real_World_Battery_Capacity_Loss
(efficiency 3.x KW vs 6.x KW)
please join Truedelta.com and input your repairs.

jkline
Posts: 102
Joined: Mon May 02, 2016 10:46 am
Delivery Date: 01 May 2016
Location: Eastern, WA

Re: Speedometer Reads 6% High

Sun Jun 26, 2016 11:57 am

All my vehicles go faster than the speedometer indicates-- my pickup is 10% faster. I just keep a gps going that shows my actual speed. Whatever speed that says is what police radar will show. At least that is what a deputy friend told me.

LeafMuranoDriver
Posts: 349
Joined: Wed May 13, 2015 8:15 am
Delivery Date: 01 May 2015
Leaf Number: 323189
Location: Los Angeles, CA

Re: Speedometer Reads 6% High

Mon Jun 27, 2016 9:52 am

It's the S model with 16" wheels/tires. I was told by the Leaf Specialist group that the odometer is 100% accurate while the speedo is not.

Low speeds under 40, it's usually 2 mph off.
Middle speeds of 50-60 is usually off by 3 mph.
Higher speeds of 60+ are off by 4+ mph.

I've been told there is nothing the dealer can do. With the S model, you cannot adjust +/- 2.5 mph like with the SV and SL.
2015 Leaf S w/ QC
Mfg: Jan. '15 // Pur: May '15
Best: 6/27/15 - 1,416 Miles - 292 GIDs - 63.11 Ahr - 22.6 kWh - 100% SOH - 97.2% Hx - 4 QC, 29 L2
Worst: 12/12/15 - 4,616 Miles - 259 GIDs - 55.02 Ahr - 20.1 kWh - 99% SOH - 82.8% Hx - 17 QC, 96 L2

User avatar
keydiver
Posts: 1080
Joined: Mon Sep 05, 2011 1:04 pm
Delivery Date: 08 Dec 2011
Leaf Number: 16484
Location: Hobe Sound, Florida
Contact: Website

Re: Speedometer Reads 6% High

Mon Jun 27, 2016 1:56 pm

TomT wrote:Nope, the speedo on my 2017 Volt is dead on... Our 2013 CUV is also dead on... Nissan is simply lazy or playing a game...

bowthom wrote:According to mfr specs and DOT regs a speedo error range must be +2.5/-0, so all speedos read fast when delivered.


I have found that every car I have owned was off at least 1-2 mph, even my 2006 Prius. The worst one was my 1986 Maza 626GT Turbo, which I had checked out by the same speedometer shop that does all the state police near me. The speedometer was high by 7% and the odometer was high by 4%, putting on 104 miles for every 100 I drove! I had them put a 5% gear reduction in, which put the speedo much closer, and started taking off some of the extra miles the odometer had added. I think I would have had to drive 200-300,000 miles to get even though.
2012 Glacier Pearl SL - Delivered December 8, 2011
10kW Solar PV for recharging!
2006 Prius with Hymotion 5kWh PHEV upgrade
Tesla 70D | Titanium Metallic | Matte Obeche Wood Décor| All Glass Panoramic Roof
Tesla Model 3 Pre-Ordered!

aarond12
Posts: 381
Joined: Thu Jun 27, 2013 11:42 am
Delivery Date: 17 Oct 2015
Leaf Number: 311353
Location: Dallas, TX

Re: Speedometer Reads 6% High

Tue Jun 28, 2016 7:55 am

My 2015 LEAF S is about 4-5% fast on speed. I plan on replacing the tires with a taller-aspect tire when they wear out to help minimize the speedometer error.
2012 Mitsubishi i-MiEV ES (lease ended) • 2015 Nissan LEAF S • Tesla Model 3 reserved
Mods: Matte black Juke wheels, LED headlights and accessory lights, horn, CarPlay receiver

NeilBlanchard
Posts: 618
Joined: Sat Oct 11, 2014 5:02 pm
Delivery Date: 14 Oct 2014
Leaf Number: 306278

Re: Speedometer Reads 6% High

Tue Jun 28, 2016 10:08 am

I think that both the speedometer and the odometer are tied together. So, if one is off, then they both are.

I noticed that a software update mostly corrected for the 16" wheels on our Leaf S vs the 17" on the SV / SL models.

LeafMuranoDriver
Posts: 349
Joined: Wed May 13, 2015 8:15 am
Delivery Date: 01 May 2015
Leaf Number: 323189
Location: Los Angeles, CA

Re: Speedometer Reads 6% High

Tue Jun 28, 2016 3:42 pm

NeilBlanchard wrote:I think that both the speedometer and the odometer are tied together. So, if one is off, then they both are.

I noticed that a software update mostly corrected for the 16" wheels on our Leaf S vs the 17" on the SV / SL models.

I think the same but was told differently by Nissan. I haven't done any actual mileage tests vs. mapped distance type experiments.

Which software update?
2015 Leaf S w/ QC
Mfg: Jan. '15 // Pur: May '15
Best: 6/27/15 - 1,416 Miles - 292 GIDs - 63.11 Ahr - 22.6 kWh - 100% SOH - 97.2% Hx - 4 QC, 29 L2
Worst: 12/12/15 - 4,616 Miles - 259 GIDs - 55.02 Ahr - 20.1 kWh - 99% SOH - 82.8% Hx - 17 QC, 96 L2

LeftieBiker
Posts: 8777
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Speedometer Reads 6% High

Tue Jun 28, 2016 4:31 pm

aarond12 wrote:My 2015 LEAF S is about 4-5% fast on speed. I plan on replacing the tires with a taller-aspect tire when they wear out to help minimize the speedometer error.


I've gotten quite used to just adding 2MPH to the speed at which I set the cruise control, knowing it reads that much high anyway. It seems like I get to go faster. ;-)
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Return to “General / Main Owners Forum”