Thread: Speedo Out

Originally Posted by d2dave

I can't see how a diff ratio change would affect cruise control. Isn't it also read from the ABS sensors?

Only going on info given too me from Slunnie, he does know quite a bit about D2s, and is a whealth of knowledge on them, one of the reasons I didn't go 4.11s on mine, I stuck with 32s and standard gearing.

Originally Posted by d2dave

That can't be right. When tyre size changes it is a percentage. So if your speedo was out, say 5 kays at fifty, it will be 10 out at a 100

You asked the question i gave you a answer from my observations with my D2a running the same tyres , All this checked against a Gps speedo ,
Sorry for offering some help

On mine..
Speedo......Actual
102............110
93..............100
74?..............80

I think it works out at 7.5% on mine.
Around town I keep 10km under to be safe.
On big trips I use the laptop for maps and the GPS screen.

I have the same size tires on my D2a, however I purchased a C1600 speedo correction unit and installed that on the ECU. It has worked a treat. There are posts on AULRO with more information.

Originally Posted by kwackpeg

I have the same size tires on my D2a, however I purchased a C1600 speedo correction unit and installed that on the ECU. It has worked a treat. There are posts on AULRO with more information.

I was under the impression it is a C6100.

Either way it is alot cheaper than a truspeed, but only single size setting not the switchable one.

I found this webpage to be a great place for info on D2s

www.slunnie.com - Aussie Built Rovers

I also used to go too Tombie page also, but that has gone.

The D2au Yahoo site, this is where 4X4Intellegence started.
https://groups.yahoo.com/neo/groups/d2au/info

Baz.

I have those exact tyres. I tested my displayed speed against actual speed as measured by gps and radar. With full tread, I established I just need to travel at 9 tenths of my target actual speed E.g travel at 54kmh for 60kmh, 72kmh for 80kmh, 91kmh for 100kmh.

10%. That's what my BFG muddies at 265/75/16 read at. 100 on speedo is 110 actual and it is linear.