Instrument indicating the speed of a vehicle in km/h or mph

learn more… | top users | synonyms

5
votes
2answers
40 views

Calculating actual speed of vehicle based on wheel size?

I started wondering today, how does one calculate the moving velocity of a vehicle if they change their tires? I know there are a lot of companies that make the gauges for tuners that change wheels, ...
1
vote
2answers
371 views

Speedometer stop working on My Opel corsa C 2006

Speedometer stop working on My Opel corsa C 2006, it always shows 0 km/h although I am driving the car, before it stop working it vibrated some times and then stopped. Does it have a specific Fuse in ...
4
votes
1answer
56 views

Prius dash board does completely off and does not turn off

I took my 2006 Prius on a trip and at some point I drove for about 15 miles in unpaved road. The road was not really bumpy but it vibrated the car a little. About 10 miles into the ride in the ...
3
votes
1answer
75 views

2012 Ford Fiesta S speedometer calibration

I just got a 2012 Ford Fiesta S (5-speed manual) a couple days ago. It's running great, but I noticed the speedometer reads about 3 MPH too high at around 55 MPH when comparing to the speed on my ...
3
votes
1answer
36 views

Sporadic speedometer, and performance lags when speedometer not engaged

I have a 2000 Honda Accord, 2.3L L4 with a 5-speed manual transmission. Recently, the speedometer has been sporadic- sometimes accurate, sometimes bouncing around, but mostly sitting at 0. I replaced ...
7
votes
1answer
98 views

How do nonlinear speedometers work?

Some cars, now have nonlinear speedometers. How can they achieve to get different spacing between some speed ranges? For better understanding, see the image of an old Audi A4 speedometer. The ...
0
votes
1answer
1k views

During acceleration, tachometer needle raises, but speedometer needle does not raise until RPM hits over 2

I have a 2000 Honda Accord SE. I have noticed that when I stepped on the gas pedal after coming to a complete stop, or just starting a drive, the tachometer needle would raise while the speedometer ...
5
votes
2answers
135 views

How does the speedometer on my dash actually work?

So pretty much everyone knows what a speedometer is, the thing on your dash that tells you how fast you are going, whether or not you're speeding, and what speed you have the cruise control set to ...
3
votes
1answer
149 views

RAV4 speedometer sometimes stops at 0, sometimes (less often) works perfectly

I have a 1998 Toyota RAV4 (FWD, automatic transmission). The speedometer sometimes works, sometimes doesn't, seemingly journey by journey - one time, it stuck at 0 at the start of a journey then began ...
0
votes
1answer
115 views

1996 Ford Explorer Speedometer and Shifting issues, O/D light flashing

My 1996 Ford Explorer began having issues at the end of a moderately long drive home while going approximately 60 miles per hour (not sure if related; I drive that speed often). The speedometer ...
4
votes
2answers
18k views

Does tire size and/or tread wear significantly affect speed and speedometer accuracy?

I've always heard that tread wear affects the speed of your vehicle; i.e. you technically are going faster with new tires than you are with old, worn tires, for a given indicated speed by the ...
2
votes
1answer
38 views

Honda City vTec Slow Start

I have a Honda City 2005 vTec Manual Transmission Car, which will be due for servicing in another 1000KM. I am not well used to driving manual car and I face a lot of traffic everyday going and ...
6
votes
3answers
10k views

Intermittently fluctuating/non-functioning speedometer in Volvo 940. Possible causes?

I have a 1992 Volvo 940. A few months ago, the speedometer started malfunctioning intermittently. Sometimes it would read correctly, other times the needle would wobble around, and sometimes it would ...
4
votes
0answers
84 views

Excursion SuperDuty Cannot Calibrate Speedometer

I have an 02 Excursion Limited Diesel and cannot get the speedometer calibrated. I purchased the vehicle with 35" tires (original equipment is 32") The tires were about 75% worn and the speedometer ...
1
vote
1answer
613 views

Read vehicle speed data in real time

I need to read vehicle speed (velocity) data in real time for my research project. How can I achieve that? What HW and SW do I need for it? I guess it can be read from CAN bus via OBD2 interface? I ...
4
votes
1answer
73 views

Why can I not set my Tempomat (cruise-control) to a speed below 30km/h?

Why is it impossible to set a speed below 30 km/h on every Tempomat I've ever seen? Is it for legal reasons or technical difficulties with low speeds? It would be helpful in a stop and go situation.
1
vote
0answers
116 views

Toyota Verso 1.6 VVTi 2006 Overheating 7 Not coming on [closed]

How do i know if my head or black is damaged. Recently my Toyota Verso 1.6 VVTi 2006 Model overheated when i checked the water from the radiator i realised that there was white greasy thing on the ...
3
votes
1answer
275 views

Speedometer is Chopy/Sticky

So this is an odd issue. 2005 Kia Spectra 109,000 miles (well maintained car) My speedometer is choppy. The problem comes and goes right now. When I am on the free way going 60 it might say 20 - ...
1
vote
1answer
97 views

Speedometer dial ranges

I was talking to my son today about a random theory of a friend of mine. His theory was that speedometers are typically set so that 12 o' clock is the optimal speed for freeway driving in that ...
2
votes
1answer
383 views

Toyota Hilux Surf 1998 Stuck in Park and speedometer and odometer not working

I just bought a 1998 Hilux Surf. It has an automatic gearbox. When pressing the brake the drive selection should be unlocked, but it does not. I need to use the "red button" to unlock the drive ...
1
vote
2answers
165 views

Volvo 940 stalls and speedometer goes wacko

My 91 Volvo 940 has been dying lately and won't restart. If you jump it, it restarts, but then sputters and stalls within about a minute. Before it stalls, the speedometer bounces up to about 20 mph ...
3
votes
3answers
208 views

Automobile EDR / Black Box - What is it for?

My partner has just started driving, and her insurance company have fitted a "Black Box" to her car. My understanding of these devices is somewhat vague, as some sites suggest that they only collect ...
6
votes
2answers
562 views

Do I have to change my speedometer setting if I get larger tires?

I bought a jeep with very small tires (not sure the exact size). I recently bought a new pair of tires that are probably 2 or 3 inches larger radius. Do I have to update my jeep so the speed is ...
0
votes
1answer
116 views

“Flight recorder” for automobiles? [closed]

As I sat in traffic court last week for a non-moving violation, many of the cases were clearly he said/she said issues.. particularly with stop sign violations. I can easily see how this specific ...
1
vote
1answer
116 views

'00 Mercury Sable speedometer and ??? issues

My Sable is having several issues and I can't tell if they are related. The car is driven less than average, three or four days per week. At some point, it lost coolant and I had to add about two ...
1
vote
2answers
290 views

1966 t-bird speedo reads way too high

Just bought a 66 tbird and everything is pretty straight, I love the car, but the main impediment to me registering it is the spedomometer, which typically reads about 50-60 when I am going much ...
1
vote
1answer
443 views

How are digital speedometer readings typically calculated?

This seemed like the most suitable SE site, I do apologize if this shouldn't go here. How are digital speedometer readings (for things like average speed calculations, etc) typically calculated - ...
3
votes
1answer
184 views

wavering speedometer

The speedometer on my '94 Suzuki Sidekick wavers sometimes. This seem to happen only when I'm accelerating in about the 40-60 kph range. I think it may happen consistently under those circumstances; ...
3
votes
4answers
1k views

is it normal for my car to accelerate on downhill when no gas is applied.

I find myself having to apply the break pedal everytime I go down an inclination. It's not too steep but the car seems to gain speed faster and faster. In the other cars I have driven, this was not ...