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Post by jake on Apr 23, 2016 14:14:51 GMT 11
It really annoys me that the Leaf Speedo is so inaccurate when it has the technology already built in to be 100% accurate. Admittedly nearly all new cars have this problem and I guess it is to encourage us to drive slower. But couldn't they have limited it to 1 or 2 k. 6 kilometers higher is too much! Within Australian design rules we could be travelling as slow as 86K with a reading of 100k on the speedo. I think this should be tightened up given todays technology.
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Post by Phoebe on Apr 23, 2016 15:30:46 GMT 11
Doesn't worry me as I drive as slow as possible not as fast as possible
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Post by jake on Apr 25, 2016 1:15:12 GMT 11
Good way to be. I should take a LEAF out of your book.
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Post by duncan on Apr 28, 2016 20:00:52 GMT 11
I absolutely hate it, especially with the enormous speedo showing the inaccurate number in front of your eyes all day.
Took it up with nissan, they said 10% low is normal and they would not do anything about it.
So I run 235/45/18 tyres and now it is spot on accurate
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Post by jeffjl on May 1, 2016 16:04:26 GMT 11
So Jake, if the speedos were 100% accurate with the original tyres what should manufacturers do with people like Duncan who put larger tyres on their vehicles?
Duncan. Any feelings/data on how the larger tyres affect the economy?
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Post by jake on May 13, 2016 12:24:56 GMT 11
Yes that would be a problem. Is that one of the reasons they do that? I'm tempted to get larger tyres next time just to get the speedo accurate.
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Post by jake on May 17, 2016 15:24:17 GMT 11
I absolutely hate it, especially with the enormous speedo showing the inaccurate number in front of your eyes all day. Took it up with nissan, they said 10% low is normal and they would not do anything about it. So I run 235/45/18 tyres and now it is spot on accurate Hi Duncan, did you just change the tyres or did you get bigger wheels as well?
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Post by duncan on May 26, 2016 8:52:28 GMT 11
Wearing out the original tyres and wanting to replace them with grippier ones drove my change, I just took the opportunity to change to hectic Nismo wheels at the same time. Yes they are larger rims at 18 x 8", and lighter (and stronger) as they are forged not cast. When choosing the new tyres I just compared the speedo reading to the actual speed (used a GPS with cruise control on a freeway), looked at the maximum tyre width for the new rim width (235 on an 8" rim) and then worked out the required sidewall size to get the right increase in diameter. Standard: 205/55/16 = 16"x25.4mm + 2x(205*.55) = 406.4 + 225.5 = 631.9mm high New: 235/45/18 = 18"x25.4mm + 2x(235*.45) = 457.20 + 211.50 = 668.7mm high There are plenty of sites that do tyre diameter calcs if that all sounds tricky The new tyres are 5.8% higher so the speedo reads 5.8% lower (yes it is the circumference not diameter that matters to the speedo, but since it is a fixed ratio no need to calculate that) And our energy economy is poor (haven't checked it for a while but I'd expect to be last in Australia). The tyres are probably part of it as they are sticky as opposed to low rolling resistance, but I think driving style is the major issue
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Post by Deleted on May 27, 2016 10:17:52 GMT 11
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Post by jake on May 29, 2016 0:32:01 GMT 11
Wearing out the original tyres and wanting to replace them with grippier ones drove my change, I just took the opportunity to change to hectic Nismo wheels at the same time. Yes they are larger rims at 18 x 8", and lighter (and stronger) as they are forged not cast. When choosing the new tyres I just compared the speedo reading to the actual speed (used a GPS with cruise control on a freeway), looked at the maximum tyre width for the new rim width (235 on an 8" rim) and then worked out the required sidewall size to get the right increase in diameter. Standard: 205/55/16 = 16"x25.4mm + 2x(205*.55) = 406.4 + 225.5 = 631.9mm high New: 235/45/18 = 18"x25.4mm + 2x(235*.45) = 457.20 + 211.50 = 668.7mm high There are plenty of sites that do tyre diameter calcs if that all sounds tricky The new tyres are 5.8% higher so the speedo reads 5.8% lower (yes it is the circumference not diameter that matters to the speedo, but since it is a fixed ratio no need to calculate that) And our energy economy is poor (haven't checked it for a while but I'd expect to be last in Australia). The tyres are probably part of it as they are sticky as opposed to low rolling resistance, but I think driving style is the major issue So is it possible to get higher tyres with the original wheels. I am not really interested in more grip. I would rather have more range.
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Post by hieronymous on May 29, 2016 10:01:05 GMT 11
If you want to know the most economical tyres for your Leaf, go look in your garage - they are already on your car. Manufacturers spend millions finding out this sort of stuff to make their vehicles look as good a purchase as possible; Nissan has from the beginning tried to make the Leaf range appear good enough for everyday use by most people. EVangelist's recent trip highlights that good range is very achievable with steady, extended touring, but all vehicles take a 40-50% economy hit in stop/start urban driving. All you can do is up your tyre pressures to 42psi (most recommended on Leaf forums), use Eco mode, and drive smoothly and conservatively.
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Post by jake on May 30, 2016 12:32:28 GMT 11
I am aware the tyres on the car are already low resistance, but I am interested in a low resistance tyre that might make the speedo more accurate.
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Post by duncan on Jun 16, 2016 20:23:42 GMT 11
Well I'd start with the same brand and model (sorry can't remember what they are as I don't have them any more....) just check the manufacturer's site for a size that will suit.
eg if you want 6% higher, have 205/55/16 now and standard 6.5" rim (which limits width to 225) a 215/60/16 would do nicely
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