diesel consumption again............ - Page 5

bramblp · 13th November 2010, 16:07

If you compsre the ODO on the sat nav with the car you will find they are very simimilar if not identical, the car's speedo is set wrong on purpose so it will always read higher, in fact the needle is correct its the numbers behind that are in the wrong place

hogweed · 13th November 2010, 16:55

Quote:

Originally Posted by bramblp

If you compsre the ODO on the sat nav with the car you will find they are very simimilar if not identical, the car's speedo is set wrong on purpose so it will always read higher, in fact the needle is correct its the numbers behind that are in the wrong place

How can the needle be correct

The needle only means something in relation to the numbers...

bramblp · 14th November 2010, 17:32

The needle deflects as directed by the ECU, any set of numbers can placed behind it in any configuration or spacing the manufacturer prefers, only by placing a correctly calibrated set of numbers behind the needle as in Police cars can the needle be interpreted correctly, the needle will always be at the same position at any given speed whatever the numbers behind.

COLVERT · 15th November 2010, 12:50

You don't need to play about with dial. As you say the ECU tells the needle where to go. It tells it to read a higher speed than the car is going by around 5%. The sat nav will give the right speed.
The ECU takes its info from the wheel sensor and so the speedo readout varies throughout the life of the tyre as its rolling diameter decreases with wear.

Colvert.

man of kent · 12th December 2010, 14:50

Can somebody compare my mpg so I can determine if anything is wrong - 75 DIESEL AUTO TOURER on a motorway 2 up, cruise control engaged with speedo at 70mph (68 actual on computer) 42mpg. FBH not on as over 5 degrees C. 20 mile run.

James.uk · 12th December 2010, 14:57

The only way to measure mpg is by doing a brim to brim test, anything else is a waste of time..
...

rossocorsa · 12th December 2010, 16:45

Quote:

Originally Posted by man of kent

Can somebody compare my mpg so I can determine if anything is wrong - 75 DIESEL AUTO TOURER on a motorway 2 up, cruise control engaged with speedo at 70mph (68 actual on computer) 42mpg. FBH not on as over 5 degrees C. 20 mile run.

sounds good to me better than I could achieve especially if from cold I very rarely achieve over 40mpg

13th November 2010, 16:07	#41
bramblp Loves to post Rover 75 CDT Join Date: Dec 2006 Location: Dublin Posts: 470 Thanks: 0 Thanked 8 Times in 7 Posts	If you compsre the ODO on the sat nav with the car you will find they are very simimilar if not identical, the car's speedo is set wrong on purpose so it will always read higher, in fact the needle is correct its the numbers behind that are in the wrong place

14th November 2010, 17:32	#43
bramblp Loves to post Rover 75 CDT Join Date: Dec 2006 Location: Dublin Posts: 470 Thanks: 0 Thanked 8 Times in 7 Posts	The needle deflects as directed by the ECU, any set of numbers can placed behind it in any configuration or spacing the manufacturer prefers, only by placing a correctly calibrated set of numbers behind the needle as in Police cars can the needle be interpreted correctly, the needle will always be at the same position at any given speed whatever the numbers behind.

15th November 2010, 12:50	#44
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	You don't need to play about with dial. As you say the ECU tells the needle where to go. It tells it to read a higher speed than the car is going by around 5%. The sat nav will give the right speed. The ECU takes its info from the wheel sensor and so the speedo readout varies throughout the life of the tyre as its rolling diameter decreases with wear. Colvert.

12th December 2010, 14:50	#45
man of kent Loves to post 75 tourer auto diesel Join Date: Nov 2010 Location: Nordelph, nr Downham Market Posts: 419 Thanks: 0 Thanked 0 Times in 0 Posts	Can somebody compare my mpg so I can determine if anything is wrong - 75 DIESEL AUTO TOURER on a motorway 2 up, cruise control engaged with speedo at 70mph (68 actual on computer) 42mpg. FBH not on as over 5 degrees C. 20 mile run.

12th December 2010, 14:57	#46
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	The only way to measure mpg is by doing a brim to brim test, anything else is a waste of time.. ...