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Just had a look at that and in a nutshell I think it says a speedo shall not read a speed less than the true speed of the vehicle, and at 100kmh should not read more than 4.4 kmh above 100kmh.
If my interpretation of Clause 5.3 is correct of course. Or have I got that back-to-front? I've had had a couple!
So now I have 295/70/18 ATs on my Y62 and at 100kmh my speedo reads about 103-104kmh.
Can’t remember what the factory wheels and rims read but must have been pretty close.
About 10 years ago I had a Navara Ute that read about 10kmh below actual speed at 100kmh (90-92kmh)! That was bad!
Actually I stuffed this up. The speedo is now more accurate than when I had the factory tyres and rims on. It was probably about 8kmh over reading from factory.
What is the charge? Eating a meal? A succulent Chinese meal??
<snip> and at 100kmh should not read more than 4.4 kmh above 100kmh. <snip>
Not true by my calculations.
Using that rule, with your true speed at 100KPH your speedo can read anything from 100 to 114KPH (basically 10% +4KPH) and comply with the ADR.
Or put another way: with your speedo reading 100KPH your true speed could be anywhere from 87.3 to 100KPH.
Not true by my calculations.
Using that rule, with your true speed at 100KPH your speedo can read anything from 100 to 114KPH (basically 10% +4KPH) and comply with the ADR.
Or put another way: with your speedo reading 100KPH your true speed could be anywhere from 87.3 to 100KPH.
Happy to be corrected mate. That’s crazy isn’t it? Really shouldn’t be that variance in factory spec cars.
What is the charge? Eating a meal? A succulent Chinese meal??
I have ordered a HP Tuners MPVI3 dongle which will hopefully arrive on Friday. Pearl will be my daily driver for the next 3 weeks so I will do some dataloging and post progress here and on YouTube, like a tutorial, so others can try it if they feel brave enough. Initially going to use VCM Suite and possibly Race Render on my Panasonic CF-31 Toughbook until I get, and it could take a long time, a newer FZ-40 Toughbook or a Toughbook tablet.
Originally Posted by rusty_nail
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