How do speedos work?

Bitza · 02-03-2018, 05:14 PM

Hi, can anybody tell me how electronic speedos work. In particular is it the ECU software that interprets the rear wheel sensor signal, then sending information to a standard speedo to show the speed. Or are the speedos diferent to suit, wheel sizes, number of sensor triggers etc.? Hopefully somebody knows! Bitza.

Darren69 · 02-03-2018, 05:32 PM

Triggers are the disk bolts and they changed from 5 to 6 and back to 5 again so ypur speedo will need to match.

slob · 02-03-2018, 05:40 PM

not sure whether it’s the ecu or the clocks which interprets the pulses from the disc bolts

Saint aka ML · 03-03-2018, 04:54 PM

Ecu same for RPM. Well the least on m695 style ecu as with right software on them you can change bolt count.

05-03-2018, 01:58 PM

Quote:

Originally Posted by Saint aka ML

Ecu same for RPM. Well the least on m695 style ecu as with right software on them you can change bolt count.

Electrics AKA "Black Magic" !

Saint aka ML · 05-03-2018, 04:20 PM

Quote:

Originally Posted by FJ43

Electrics AKA "Black Magic" !

No Electrics AKA "Go Faster for less"

ECU Programming to make it work not hard, fuel map different story but changing what each pin does in ECU is just a bit of software coding with off the shelf programmers.

Assuming ECU is not password protected like the new ones

Bloody tree hippis

Bitza · 06-03-2018, 10:12 PM

Hi Saint, you seem to have some idea about how these speedos work, so is it the ecu software that processes the information from the sensor, to take into acount the number of triggers/rev & the tyre size etc, which then activates the standard speedo to show the speed? By standard speedo I mean that the same instrument is fitted to all models and that it relies on the ecu software to calculate the diferences between the models specs. Thanks Bitza.

02-03-2018, 05:14 PM	#1
Bitza Bronze Member Join Date: Jul 2006 Location: Poole Bike: M900ie Posts: 471	How do speedos work? Hi, can anybody tell me how electronic speedos work. In particular is it the ECU software that interprets the rear wheel sensor signal, then sending information to a standard speedo to show the speed. Or are the speedos diferent to suit, wheel sizes, number of sensor triggers etc.? Hopefully somebody knows! Bitza. __________________ Bitza

02-03-2018, 05:32 PM	#2
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,029	Triggers are the disk bolts and they changed from 5 to 6 and back to 5 again so ypur speedo will need to match. __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

03-03-2018, 04:54 PM	#4
Saint aka ML Junior ah to be young Join Date: Nov 2007 Location: London Bike: Multiple Monsters Posts: 2,058	Ecu same for RPM. Well the least on m695 style ecu as with right software on them you can change bolt count. __________________ "I am Lucazade"

06-03-2018, 10:12 PM	#7
Bitza Bronze Member Join Date: Jul 2006 Location: Poole Bike: M900ie Posts: 471	Hi Saint, you seem to have some idea about how these speedos work, so is it the ecu software that processes the information from the sensor, to take into acount the number of triggers/rev & the tyre size etc, which then activates the standard speedo to show the speed? By standard speedo I mean that the same instrument is fitted to all models and that it relies on the ecu software to calculate the diferences between the models specs. Thanks Bitza. __________________ Bitza

02-03-2018, 05:40 PM	#3
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,714	not sure whether it’s the ecu or the clocks which interprets the pulses from the disc bolts