Speedo correction D2 on 32's

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Originally Posted by kelvo

Just looked, it was the Pink with Green tracer that I cut, and joined the C6100 to. This is at the instrument cluster, plug C0230 pin 16.

I found the easiest way was to remove the instrument surround plastic cowl, and fish the two C6100 wires up And join in near the C0230 plug. C6100 brown wire to the Pink/Green from the ECU and C6100 Blue/Green to the Pink/Green going to the instrument plug C0230.

I have used the following switch settings;

01011010 for 235/85R16

10101010 for 245/75R16

Every tyre make and model will be slightly different, even if they are the same size, but should give a starting point for you.

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Cheers Kelvo, thats exactly what im after.
So Brown > ECU
and Green > Dash
White is unused?

Ive done the pre-fishing of the wires from the C6100 up from behind the dash (id done it before running my lightbar to a factory binnacle switch so i knew exactly where to poke the wires)

All thats left to do is actually snip the pink/green-trace wire and connect the module in as you've suggested.
then connect it to power(ill use Slunnies guide to double check acc source) and ground it.

One other thread ive read suggested
11101010 for a 265/75r16 so ill use that as a base.
Failing that, ill chime back in here with a request for help to decipher how to work out the ratio and adjust accordingly.


While ive got the dash off, i may aswell replace the blown odometer globe too :p

Correct, the white from the C6100 is unused. I taped the end up to stop it shorting on anything.

Awesome, cheers.. Yeah I normally just heat shrink over unused wiring

Will update with the results!

I found that my speedo was out by 8% measured against GPS, but I am a bit anal (265/75 R16 Cooper ST).

Its worth checking the error with a GPS at various speeds as the error varies with speeds. I set mine so the speedo is accurate at 100km and it ends up that an actual 50km shows 55kmh I think it is. I have the Truspeed though, which also uses trimpots rather than dip switches.

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Originally Posted by Slunnie

Its worth checking the error with a GPS at various speeds as the error varies with speeds. I set mine so the speedo is accurate at 100km and it ends up that an actual 50km shows 55kmh I think it is. I have the Truspeed though, which also uses trimpots rather than dip switches.

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I had heard this so when I did mine(C600) I checked it at 100Kph, 80, 60 and fifty and I found it to be pretty right at all these speeds.

Yep, I'll be check in at various speeds with multiple units (Navman and HEMA iPhone app)

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Originally Posted by d2dave

Yep. The Jaycar will not work. I used the same as above, followed Slunnie's tutorial and all works a treat. I have 265/75/16.

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Hello d2dave,

Resurrecting this old thread to ask how your C6100 Speed Ratio Interface has performed since you installed it back in 2014..

onebob LROCV #131

Mine has been trouble free for the last four years.

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Originally Posted by kelvo

Mine has been trouble free for the last four years.

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Good news because I’m about to invest in a C6100. Saw your post of 17 Sept 14 and will try your switch settings for my 235/85/16 shod steelies.

NB: whilst cruising at 100km/hr via cruise control my GPS gives my actual speed as 108km/hr.