Speedometer / odometer

[Mike1424]

I have KO2 tires on the Grenadier. The speedometer is off 4-5%, and I find this unacceptable. I say confidently off because I have 2 gps off cell towers and 1 satellite gps - all three come up the same speed except Ineos OEM speedometer. The dealership originally told me they and Ineos are aware of the problem. I took my vehicle to the dealership and now I’m told it’s 100% accurate. I have been driving cars for almost 40yrs and know the different between 80mph and 75mph. I plan to do a miler marker test this week. I am disappointed because it’s a lack of attention to detail and an unwillingness for Ineos to fix. Plus when the vehicle gets to 100k miles it only really have 95k miles- or so I suspect.

Also annoyed the door handle buttons stick but defects to happen and this Ineos is going to fix.

 

[DaveB]

I have KO2 tires on the Grenadier. The speedometer is off 4-5%, and I find this unacceptable. I say confidently off because I have 2 gps off cell towers and 1 satellite gps - all three come up the same speed except Ineos OEM speedometer. The dealership originally told me they and Ineos are aware of the problem. I took my vehicle to the dealership and now I’m told it’s 100% accurate. I have been driving cars for almost 40yrs and know the different between 80mph and 75mph. I plan to do a miler marker test this week. I am disappointed because it’s a lack of attention to detail and an unwillingness for Ineos to fix. Plus when the vehicle gets to 100k miles it only really have 95k miles- or so I suspect.

Also annoyed the door handle buttons stick but defects to happen and this Ineos is going to fix.

99% of car speedos read higher than the true speed.
Most countries have similar laws to here in Australia, which state a speedo can never read less than the true speed.
This is to stop people speeding when not intended and taking legal action against the manufacturer.
Typically a speedo will read 4-6% higher than true speed.

 

[Ovrland Bill]

My speedometer over reads, as is typical, but the odometer is amazingly accurate. (The “optimistic” speedometer, coupled with the ADAS Overspeed Warning, does make for a noisy experience when driving at the actual speed limit.)

 

[anand]

Nearly every vehicle on the road reads high, it's a safety factor

 

[Tazzieman]

If you drive Euro vehicles from 1970s on , you know it reads high.
If you're new to Euro vehicles, it's a surprise. Like indicator stalks on the "wrong" side if you've always driven non Euro setups.

 

[DaveB]

My speedometer over reads, as is typical, but the odometer is amazingly accurate. (The “optimistic” speedometer, coupled with the ADAS Overspeed Warning, does make for a noisy experience when driving at the actual speed limit.)

See if you lived in Australia........the land of the free........from stupid speed warnings you could just turn it off or change the settings to anywhere between 10 kmh and 150 kmh.

 

[Tazzieman]

The hand is watching every move ... every touch

 

[DaveB]

The hand is watching every move ... every touch

I was using the force

 

[Tazzieman]

I was using the force

You're a bit early. 4 days to be precise

 

[landmannnn]

In most of the world speedos must be between 100% and 110%, so normally set at 105%.
In north America the laws are 95% to 105%, so normally set at 100%..

 

[ECrider]

Fix - run larger tyres (285/70/17 or equiv diameter) and you'll get closer to spot on.

 

[JGB5]

I have KO2 tires on the Grenadier. The speedometer is off 4-5%, and I find this unacceptable. I say confidently off because I have 2 gps off cell towers and 1 satellite gps - all three come up the same speed except Ineos OEM speedometer. The dealership originally told me they and Ineos are aware of the problem. I took my vehicle to the dealership and now I’m told it’s 100% accurate. I have been driving cars for almost 40yrs and know the different between 80mph and 75mph. I plan to do a miler marker test this week. I am disappointed because it’s a lack of attention to detail and an unwillingness for Ineos to fix. Plus when the vehicle gets to 100k miles it only really have 95k miles- or so I suspect.

Also annoyed the door handle buttons stick but defects to happen and this Ineos is going to fix.

There is nothing to fix with regard to speedometer accuracy. INEOS, like most auto manufacturers, is following industry practice of ensuring indicated speed, i.e. the speedometer, is reading higher than actual speed by about 2 to 4%. European UNECE Regulation 39 mandates speedometers must not show less than actual speed, and with vehicles being sold internationally it only makes sense manufacturers everywhere would try to follow that, including those in North America where there currently are no regulations on speedometer accuracy.

The vehicle mileage is not related to vehicle speed. Mileage is read by the odometer, speed by the speedometer. Two different things.

 

[LabRat]

Given how inaccurate the fuel efficiency calculation is, I wonder what that is using.

 

[CL66SEN]

I have KO2 tires on the Grenadier. The speedometer is off 4-5%, and I find this unacceptable. I say confidently off because I have 2 gps off cell towers and 1 satellite gps - all three come up the same speed except Ineos OEM speedometer. The dealership originally told me they and Ineos are aware of the problem. I took my vehicle to the dealership and now I’m told it’s 100% accurate. I have been driving cars for almost 40yrs and know the different between 80mph and 75mph. I plan to do a miler marker test this week. I am disappointed because it’s a lack of attention to detail and an unwillingness for Ineos to fix. Plus when the vehicle gets to 100k miles it only really have 95k miles- or so I suspect.

Also annoyed the door handle buttons stick but defects to happen and this Ineos is going to fix.

Part of the issue will be due to the KO2 tyre size versus the Bridgestone tyre size, , plus whether you're running 17's or 18's, noting that the Gren's speed reading 'configuration' has to deal with different stock tyre sizes and can therefore never be 'accurate' for all.

Per below, if you are running 18-inch rims with the Bridgestone Duellers, you will get different (and more accurate) readings than if you are running 17-inch wheels with KO2s (as I am).

The comparison table below shows how the 18-inch Dueller is 5.88% larger than the KO2, which translates to a 1.4% deviation in readings on the speedometer. Note that the speedometer difference shown in the table below is indexing the first tyre to the second (i.e. 100 vs 101.4) and is not saying that the first tyre would read 100 at 100mph.

Speedometer 'accuracy' readings for 265/70/17 BFG KO2:

Speedometer 'accuracy' readings for 255/70/18 Bridgestone Dueller:

All of the above also assume that you are running appropriate tyre pressures, as different tyre pressures will directly affect the diameter of a moving vehicle. The laden weight of the vehicle will also impact this.

As mentioned by @ECrider you can solve your differences via a larger tyre size. It feel that it's a little unfair to expect INEOS to have a speedometer that gives the same accuracy for all 'standard' tyres fitted and in all modes of use, given it's many different intended applications.