speedo adjustment

[basstard440]

I have a 2000 disco and 32" tires on it. The speedometer is off around 5 mph. Does anyone know how to correct it? I have some time to get the info because I will be doing true tracks and gears in about 2 months so I figured that I will do it all in one shot (that is if it is mechanical and not computer) thanks Joe

 

[joey]

I presume you tested your speed against a GPS?

Normally Land Rovers Speedometers are off to begin with. I know on my 97, after installing 31 inch tires My speedometer matched my GPS.

If you have matched it, and it is still off, there is an electronic controller out there (designed by someone for jeeps) that will work... just can't remember the web address off the top of my head. I am sure a googe search will find it.

 

[basstard440]

Yes Joey, Gps. Thanks I'll look it up.

 

[basstard440]

Hey joey, is this what you were speaking of?
http://www.4wheelerssupply.com/catalog/product_info.php/products_id/1762

 

[Disco Squared]

I may be wrong, but I don't think those speedo controllers will work on a DII because the ECU determines speed through all four ABS wheel sensors, not just a transmission sensor. Having a transmission sensor alone would be great because you could correct the speed discrepancy by changing the ring and pinion to match the stock wheel speed, but unfortunately thats not the case for our DIIs. I've heard the speedo can be adjusted through ECU reprogramming though.

 

[joey]

Disco Squared, I believe you are correct... I keep forgetting the D2 gets speed from the wheel sensors...