Reply With QuoteThat's because you can't look at it.
When they set up the Gap IID for the DS you will be able to use it to look at the real speed, which as I said, is known by the car and adjusted up before being displayed, to meet the legal speedo requirements.
Master
I'm just wondering how to display the GPS speed. I can't find it.
2016 Disco Sport HSE TD4.
Wizard
SupporterThat's because you can't look at it.
When they set up the Gap IID for the DS you will be able to use it to look at the real speed, which as I said, is known by the car and adjusted up before being displayed, to meet the legal speedo requirements.
Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
Master
Well, that makes sense!Originally Posted by BobD
The car can tell you the actual speed, but 'legal requirements' won't let the car tell you the actual speed. So you have to sit there and do little sums in your head to work out the speed you are actually doing.
Who thought this one up?
Wizard
SupporterI suspect that all modern cars do the same sort of thing. It is the same in the 2010 D4 and is probably driven by ADR's or whatever other rules Land Rover has to comply with all over the world. Like you, I hate it and have to continually convert and set the cruise higher.
Certainly the same sort of speedo "error" on all recent cars of different brands that I have had. Others seem to have had more accurate speedos on some brands from their posts on the subject on the D4 forum.
If you can find a place where you can check distances (WA has km pegs every 2 km on major roads) you can check the odometer accuracy and you will find it is almost perfect because both distance and speed are calculated accurately by the ECU.
With the GAP IID on my D4 you can display the actual speed as it is a parameter that the ECU's generate. The only trouble is that my bigger tyres mean that the displayed speed is accurate and the Odo is out, so there is no point looking at the now wrongly calculated ECU speed!
Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
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