Mine is almost 10% out when compared to a Garmin GPS.
Mine was at least 10% out. Now that I've put on the larger diameter wheels/tyres and adjusted the calibration, it's about 3% out. The car still says it's going faster than it actually is but I don't worry about it any more.
10% is enough that people will tailgate you, and the potential is there for you to make a mistake and get caught by a speed camera. With 3% this all goes away.
I still find it completely bizarre and baffling that Nissan would send cars out that it knows have incorrect speedometers.
no Nissan sent cars out that have speedos that are within the margin of error mandated by the ADR rules. all cars are within this margin of error just some better than others and it's not just Nissan and not just the LEAF. I've had Toyota drivers complain too.
This new rule requires that the speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h. Significantly, this change means that speedos must always read 'safe', meaning that the vehicle's true speed must not be higher than the speed indicated by the speedo.
Post by markrmarkr on Sept 9, 2014 14:11:47 GMT 11
The other annoying thing about this is that it throws out things like the efficiency calculations, which has follow on problems like the estimated range of the navigator- estimated distance to destination (Map based) is not going to match what the car can give because the efficiency estimate is wrong.
There are a swag of similar issues - I'm sure you can think of your own pet ones.
Post by markrmarkr on Sept 10, 2014 19:21:02 GMT 11
Yes Jim, the odometer and speedometer are both out by about 10%.
So the Leaf tells you you are going faster and further than you are actually going.
This means the efficiency calculation is out, telling you you have a better KWh/km than you really have.
As a result of the efficiency being out the GOM is also out. It tells you you have more range than you really have. Thankfully the 2 hidden bars will probably save you, but do we want to be operating this way?
Wait there is more..... even carwings is out, telling you that you have traveled further and with better economy than you really have.
It's scary to me that Nissan has been so fast-and-loose with this stuff, and just not thought through the consequences. All it takes to see the problem is a gps speedo app on your phone and a short trip. Can someone tell me: how is it possible for them to make such a brilliant car, yet screw up on something so basic?
Its like someone realised that the performance would be better with smaller wheels, and the marketing people decided this was real important. So they made the change at the last minute, but forgot to tell the config engineers to recalibrate the speedo and odometer.
Sent from my SM-N9005 using proboards
Last Edit: Sept 10, 2014 21:20:40 GMT 11 by markrmarkr
With my GPS showing 50 km/hour, on a straight road, in cruise control, the Leaf speedo reads a steady 54 km/hour. So that's about 8% difference, which sounds like what other people are experiencing.
So I found this post really interesting, and I could access the menu as long as my button pressing is reasonably brisk.
However, when I tried doing the adjustment, at both +2.5% and at -2.5%, I didn't notice any change in reported speed. For example, with the GPS reading 100 km/hour, the the Leaf speedo reported 108km/hour, irrespective of the correction was 0% (off), or at +2.5%, or at -2.5%.
All measurements were made with the car in cruise control, on a straight stretch of road, and observed for about 10 seconds once the speeds were steady.
Any ideas what I might be doing wrong? I made sure that I had hit the 'Set' button (as per picture). Or maybe this is not having the effect on reported speed that we are assuming it's having?
(In case you're interested, here are my results: The lines of best fit for the +2.5% and the -2.5% are on top of each other, so one is obscuring the other; while this doesn't show any difference, it does show nicely the 8% offset over a range of speeds.)
Nissan Leaf: built 06/12, purchased 08/14, 30k km 02/16
Post by markrmarkr on Sept 18, 2014 21:39:39 GMT 11
Mark, I have to admit I didn't check the effect of the recalibration change as thoroughly as I could have. It is such a painful process, doing it several times in order to compare results was beyond my patience threshold. But it looks like you have done a good job. Coincidentally I'm taking my car in for it's first annual service tomorrow, so I'll ask the guys at Steve Jarvin service department if they have any ideas.
Post by quaternary on Sept 19, 2014 8:05:05 GMT 11
Hi Mark, That'd be terrific - I look forward to hearing what they say.
Hi jeffjl, Well that's a great point you make - if all we can do is claw back 2.5%, that's at best around a quarter of the offset, which still leaves a sizable offset; sigh. By the way, my readings went up to 100km/h without detecting a change.
Nissan Leaf: built 06/12, purchased 08/14, 30k km 02/16
Coincidentally I'm taking my car in for it's first annual service tomorrow, so I'll ask the guys at Steve Jarvin service department if they have any ideas.
So it was you! I was there this morning for my service and I asked them how many LEAFs get serviced there. They said they've got two today and I wondered if I knew the other owner. They said have had eight in a day and then go for weeks without seeing one, I wasn't sure if that was an exaggeration.
The service only took half an hour and I always wonder if they actually did anything besides a cursory glance at the important bits.
Anyone else who's due for a service at Steve Jarvin might want to get it done soon, they said the LEAF mechanic is going to take some time off when his wife has her baby.
Post by markrmarkr on Sept 19, 2014 15:07:58 GMT 11
Yes it was I. The car is with them now. It'll cost $263.80 !!! I asked what they would do for that price. He started talking about oil filters and such, then realised his mistake, and said there were lots of diagnostics they had to run yada yada... And this with no tyre rotation required. That would have bumped the price by $30.
Anyway, I asked about the calibration feature. He wasn't 100% sure but said he belived that all new cars are required to have their speedo's 10% out by law. So the adjustment feature had been disabled in order to comply with this. So Mark it looks like people from NZ are just caught up because your Leafs come from Australia. He said he'd show me some paper work later when I pick the car up. I'll post later when I know more.
Incidentally, I tested the Steve Jarvin carger, and it's working fine.
Post by markrmarkr on Sept 20, 2014 15:29:32 GMT 11
When I returned to pick up my car the price had changed to $259.25. Whatever...
The answer on the calibration question turned out to be a quote from "the daily telegraph, ask smithy with Graham Smith in carsGuide.com.au" - 20 February 2009, page 93.
He pulled it from a folder (one of many copies), which looked like it should be called "the give a copy to customers when they ask these questions folder"
here is the quote:
What can you tell me about the Australian standard for speedometers that allows a 10 per cent tolerance? Stephen Harrington
SPEEDO tolerance is covered by ADR, which says it must be within a tolerance of minus zero to plus 10 per cent plus 4km/h. That means it can't read lower than the real speed of the car but can read faster up to 114km/h when the car is actually doing 100km/h."
I think some-one else has already told us this. Was it you Gab?
Anyway, I'm not really happy with this answer but I guess it's all we will get.
Bottom line is - If you want to improve your speedo accuracy, your only real option is to change your wheels/tires. Duncan and I have both done this with good results.