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Re:Re:JB74 speedo correction with bigger tyres/re-gear?

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20 Jan 2024 15:17 #253604 by 300bhpton
Anyone know how the speedo can be re-calibrated on the 4th Gen if you significantly change tyres size and/or add a re-gear set in the transfer box?

Not sure if it is gear driven or if there is an electronic way of doing it.

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20 Jan 2024 18:08 - 20 Jan 2024 18:08 #253615 by Soeley
I have just copied this from the Workshop Manual:

Speedometer
ECM calculates vehicle speed using wheel speed sensor signal from ESP® control module and sends vehicle speed signal through CAN communication to combination meter.


So does that mean it will self calibrate?
Last edit: 20 Jan 2024 18:08 by Soeley.

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20 Jan 2024 18:30 #253616 by mlines

Soeley wrote: I have just copied this from the Workshop Manual:

Speedometer
ECM calculates vehicle speed using wheel speed sensor signal from ESP® control module and sends vehicle speed signal through CAN communication to combination meter.


So does that mean it will self calibrate?


No, because it will be calculating based on the standard wheel diameter

Sent from my ThinkPhone by motorola using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
The following user(s) said Thank You: Soeley

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20 Jan 2024 19:42 #253619 by Soeley

Soeley wrote: I have just copied this from the Workshop Manual:

Speedometer
ECM calculates vehicle speed using wheel speed sensor signal from ESP® control module and sends vehicle speed signal through CAN communication to combination meter.


So does that mean it will self calibrate?


No, because it will be calculating based on the standard wheel diameter

Sent from my ThinkPhone by motorola using Tapatalk

Yes, of course :)

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20 Jan 2024 22:14 #253622 by mlines
What would be nice is if you could enter the tyre diameter into the controller

Sent from my ThinkPhone by motorola using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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20 Jan 2024 23:33 #253623 by 300bhpton
We could do we someone selling something like this for the Jimny then. Surprised there isn’t, as there are loads of people on YouTube running all sorts of different tyre sizes on the Gen 4.

ashcroft-transmissions.co.uk/product/speedo-correction-kit/

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21 Jan 2024 10:28 - 21 Jan 2024 10:37 #253628 by mlines
They do, I ran the kit version of this on BigJimny for a while

www.jaycar.com.au/speedo-corrector-module-for-cars/p/AA0376

Sent from my ThinkPhone by motorola using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 21 Jan 2024 10:37 by mlines.
The following user(s) said Thank You: 300bhpton

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21 Jan 2024 11:37 - 21 Jan 2024 11:44 #253631 by mlines
Update.

The Gen4 is a twin double sensor (four in total) system whilst the Gen 3 is a single sensor system, therefore this kit would not work

Sorry, I assumed the system was similar with a single dedicated sensor for the speedo. 

I guess that due to the extensive electronics providing the ESP (Electronic Stability) they need redundant double sensors and then two of them to compare front and back

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 21 Jan 2024 11:44 by mlines.

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