Timeline for How are digital speedometer readings typically calculated?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 9, 2012 at 13:40 | comment | added | Rory Alsop | hahahaha - I may have a similar motive for checking the relative errors :-) | |
| Nov 9, 2012 at 13:11 | comment | added | Anonymous | @RoryAlsop - Good point. I never actually said my reason for asking this question, but basically I like cruising smugly past people on average speed checked sections of motorway. :) It looks like I can sit at 57-58mph on the speedometer (a true 52-53mph) and not get a ticket, lol. | |
| Nov 9, 2012 at 12:12 | comment | added | Rory Alsop | @Anonymous - sometimes the differential doesn't vary like that. Certainly on analogue speedos, it may vary. Mine is quite accurate at 30, gets further from the truth up to about 90 then starts to creep back towards the correct speed | |
| Nov 9, 2012 at 10:53 | comment | added | Anonymous | @mac - Yeah. Wish my car had a real-time digital speedometer that I could compare to speed on GPS. I guess I could always set cruise control at 50mph on the speedo and compare it to the value read on the trip computer. Or time a distance.. but then I'd expect it to be an increasingly larger differential the higher the speed... Ah well, it's no big deal. :) | |
| Nov 8, 2012 at 15:32 | comment | added | mac | @Anonymous, my experience with VWAG cars (VWs and Audis) is that the analog speedo reads fast, while the digital odometer and trip computer read pretty accurately. Your comments seem right in line with what I see in VWAG vehicles I've driven. | |
| May 19, 2012 at 12:03 | comment | added | Rory Alsop | The tyre pressure does impair the readings, which is one of the reasons all speedos over estimate the speed: legally it is easier for them to say as long as the speedo is at or below the limit your actual should Bree below there limit. The actual variance will depend on the headroom the manufacturer built in. | |
| May 19, 2012 at 9:12 | comment | added | Anonymous | So how accurate might that computer be? Do I assume that the 54mph showing on the speedo is just 50mph (the speed shown by the computer) marked up to compensate to give drivers a bit of 'headroom'? I just want to know what speed I'm actually going! lol. And would the tyres being over/underinflated impair readings? | |
| May 14, 2012 at 7:56 | history | answered | Rory Alsop | CC BY-SA 3.0 |