Recalibrating the speedo

[Barraman]

According to my GPS, the speedo in my D4 is over-reading by 6 kph.
Can I recalibrate the speedo with my Gap tool?
If so, can someone point me in the right direction? I can’t find anything in the Gap tool manual.

[p38arover]

Leave it.

[Stuart02]

Just work out how much larger your tyres need to be!!

[DiscoJeffster]

Just work out how much larger your tyres need to be!!

And then give up if you have 19” because you can’t.

[shanegtr]

With my D3 I adjusted the speedo by changing the tyre radius in the CCF. A little bit of trail and error to get it right

[DieselLSE]

The best way is to modify the CCF.
The usual "as built" speedo setting is set at 3.5% below actual and at +2kph.
Although each of these parameters has a number of settings, it appears as if there are only two main market settings. In Genesis, this is displayed under Jaguar Speedometer Calibration Market which can be found under the Warnings and Messages tab. The choices are:
Market 0: 3.5% + 2kph
Market 1: 2.0% + 0kph
Accordingly, if the above is set to Market 0, then the following parameters are also set:
Jaguar KPH Offset: +2kph
Jaguar Percentage Scaling Factor: 3.5%
I changed all three settings as follows:
Market 1: 2.0% + 0kph
Jaguar KPH Offset: 0kph
Jaguar Percentage Scaling Factor: 2%
This gives a spot on speedo on 19” 255/55/19 and 18” 265/60/18

[Tombie]

With a GAP tool: (this is straight from GAP)


For Discovery 3 2004-2009 and Range Rover Sport 2005-2009
Menu–Car Config–Instrument Pack–Tyre Radius

For 2010+ vehicles

Only one of the following settings will work and it depends on the car itself. Menu–Car Config–Instrument Pack–

This setting, Tyre Size MSB – IPC

Or this one, Tyre Rolling Radius (mm) – ABS

[Barraman]

Thanks for the help, it got me headed in the right direction!

OK, I'm getting close - but not perfect.

Gap tool: Menu–Car Config–Instrument Pack–

then I played with these:

KPH offset: was +2.0kph, now +0.0kph

Speed scaling setting: was 3.5%, now 1.5%

Now the cruise control setting and the GPS speed agree +/- 1.0 kph, and the speedo over-reads 3.0 kph.

So, GPS = 100, Cruise control = 100, speedo = 103.

[DieselLSE]

Check that the wheel size is set correctly. I find it odd that the cruise control is set to 100 yet the speedo displays 103.
You may also need to find the market setting as that somehow seems to interact with the other two settings you've adjusted.

[Barraman]

Check that the wheel size is set correctly. I find it odd that the cruise control is set to 100 yet the speedo displays 103.
You may also need to find the market setting as that somehow seems to interact with the other two settings you've adjusted.

Where do I find the 'market setting' and the 'wheel size'? Couldnt see them in the menu I followed.

[DieselLSE]

Where do I find the 'market setting' and the 'wheel size'? Couldnt see them in the menu I followed.
No idea with GAP, sorry. With Nanocom's Genesis you can find and edit it in the CCF file. I'm sure there'll be a way with the GAP tool.

[Tombie]

You didn’t read my post [emoji6]

On a D3 you ONLY adjust the tyre radius.

[DieselLSE]

On a D3 you ONLY adjust the tyre radius.
Oops! Sorry all for being misleading. I hadn't realised it was a D3.

[Tombie]

Oops! Sorry all for being misleading. I hadn't realised it was a D3.

Sorry mate. Wasn’t aimed at you [emoji6]
Aimed at Barra’ who is changing everything but the specified item that Gap advise to change.

[Redtail]

According to my GPS, the speedo in my D4 is over-reading by 6 kph.
Can I recalibrate the speedo with my Gap tool?
If so, can someone point me in the right direction? I can’t find anything in the Gap tool manual.
Tyre size worked for my 2011 D4
find Tyre Size MSB - IPC

I went from 31 to 33 to get it spot on with the 19's that were fitted at the time.
Changed that same parameter when I went to 18's, but I can't recall what value I had to use.

[ramblingboy42]

What is a ccf?

sounds like a fire extiguisher.

[Tombie]

What is a ccf?

sounds like a fire extiguisher.

Car
Configuration
File

[DieselLSE]

What is a ccf?
Car Configuration File. It is the primary binary file that contains the parameters of the car and is referenced by other ECUs. Each ECU has it's own software version, too.
There are some parameters that you can edit if you have a suitable tool, like a Nanocom or a GAP.
You can do simple changes like removing the leading zero on the odometer (up to 100,000kms) so that it displays 75028km instead of 075028km. Or more tricky stuff like calibrating the speedo on a D4 or adding new features to your car like upgraded sound systems or even an e-diff (but you also need the hardware, wiring and upgraded ECU software and a bit of luck as well).

[Barraman]

OK reset!

The vehicle is a 2015 D4 with Pirelli 255/55/19 tyres.

[DieselLSE]

OK reset!

The vehicle is a 2015 D4 with Pirelli 255/55/19 tyres.
PM me your VIN and I'll check your as built CCF.

[rocket rod]

The best way is to modify the CCF.
The usual "as built" speedo setting is set at 3.5% below actual and at +2kph.
Although each of these parameters has a number of settings, it appears as if there are only two main market settings. In Genesis, this is displayed under Jaguar Speedometer Calibration Market which can be found under the Warnings and Messages tab. The choices are:
Market 0: 3.5% + 2kph
Market 1: 2.0% + 0kph
Accordingly, if the above is set to Market 0, then the following parameters are also set:
Jaguar KPH Offset: +2kph
Jaguar Percentage Scaling Factor: 3.5%
I changed all three settings as follows:
Market 1: 2.0% + 0kph
Jaguar KPH Offset: 0kph
Jaguar Percentage Scaling Factor: 2%
This gives a spot on speedo on 19” 255/55/19 and 18” 265/60/18

I've tried all the methods included in this thread, plus another thread I started, plus a few other settings myself and none had worked on my car (MY16 D4). Until, that is, I tried your Market 1 method and it worked a treat. Thanks.