Thread: Speedo, Tyres and Correction

The Disco2 reads its speed via the ABS sensors which all report back to the SLABS computer which then averages the speed from the 4 sensors and outputs that as a single signal. That signal then is split to the speedo and the BCU. I’m not sure if the Nanocom picks up its speed from the SLABS directly of the BCU.

Originally Posted by Slunnie

The Disco2 reads its speed via the ABS sensors which all report back to the SLABS computer which then averages the speed from the 4 sensors and outputs that as a single signal. That signal then is split to the speedo and the BCU. I’m not sure if the Nanocom picks up its speed from the SLABS directly of the BCU.

Yep, Nanocom has a multiplication factor that you can play with until you get the right speed. Its on the same screen as the coolant temp alert setting. I have the Hunter-Di supplied C6100 adapter as well, so amuse myself checking speeds on speedo, nanocom and gps against km signs on the way down Forrest H'way between Perth and Bunbury etc.

I just use the gps as a speedo as the one in the D2a is out 6k's at 100kph.

Originally Posted by trout1105

I just use the gps as a speedo as the one in the D2a is out 6k's at 100kph.

When I was getting engineering approval, they wouldn't let me use GPS as the primary speed reading device because it doesnt work in all conditions.

A speedo correction unit is probably only $100 or so, saves me all of the calculations also.

Originally Posted by Slunnie

When I was getting engineering approval, they wouldn't let me use GPS as the primary speed reading device because it doesnt work in all conditions.

A speedo correction unit is probably only $100 or so, saves me all of the calculations also.

Slunnie,

with your speedo correction device does your cruise control still work?. I think I remember reading that you had issues getting it to work after the install of the correction device.

FYI, I have the same as your original 4x4 intelligence / superlift one and would like to install it but do a lot of highway work so want the cruise control.

cheers, Chris

Personally adding MORE electronics to a D2 is Not a great idea, Using a GPS to get an idea of the difference between what is being displayed on the speedo and you actual speed and driving accordingly is a much simpler option to adding another electronic device

Originally Posted by 4runnernomore

Slunnie,

with your speedo correction device does your cruise control still work?. I think I remember reading that you had issues getting it to work after the install of the correction device.

FYI, I have the same as your original 4x4 intelligence / superlift one and would like to install it but do a lot of highway work so want the cruise control.

cheers, Chris

Hey Chris, yes, no problems with the cruise control. Mine is an Auto transmission. I do a lot of highway work also and love the CC.

The issue is with the manual transmissions and losing CC. If the roadspeed doesnt match the gearing, then you will lose CC. Ie on a manual, the speedo correction has to match the driveline gearing to retain it. Off the top of my head you can intercept the signal to the Dash, but I have not tried that and I can not confirm it doesnt upset the dash/BCU odometer confirmation, but I do understand this to the be workaround.

As already stated wheel speed sensors send signals to the SLABS and Nanocom reads from there.
Nanocom will always agree with the speedo unless you play with the ratio (EVO only)
A speedometer correction unit will intercept output signal from the SLABS to speedometer and provide permanent correction.
You cant permanently correct the speedo reading with Nanocom.
As far as the cruise control question goes. If you have a C1600 from Hunter Di, everything will work as factory if installed correctly. I believe the same applies for "truespeed" also.