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1answer
19 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
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1answer
46 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 ...
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1answer
163 views

During accelerating, tachometer needle increased, but speed needle does not increase until RPM hits over 2

I have a 2000 Honda Accord SE. I have noticed that when I stepped on gas pedal after coming to a complete stop, or just starting a drive, the tachometer needle would increase while the speedometer ...
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2answers
73 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 ...
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3answers
132 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 ...
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2answers
309 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 ...
3
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2answers
5k 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 ...
0
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1answer
113 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 ...
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1answer
73 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
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2answers
177 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
264 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
124 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
606 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 ...
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2answers
6k 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 ...