What is the use of a tachometer dial in a car?

Question

As a driver what do I use it for. I find no use to it in the past 20 years i have been driving.

Answer 1

similar to the temp gauge or the oil pressure gauge, it just gives you info as to whats going on with your car. if everything is normal you don't need any of these, they are only important when things start going wrong.if you a are driving a car with an automatic transmission.

Answer 2

Tachometer Definition

Answer 3

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RE:
What is the use of a tachometer dial in a car?
As a driver what do I use it for. I find no use to it in the past 20 years i have been driving.

Answer 4

A tachometer gives you your engine RPM (revolutions per minute). It is surprising that you've been driving cars with tachos for more than 20 years.

It is especially useful as a feedback to tell you how you are driving, and how your car is behaving especially when you have fitments like a turbo charger (Indigo, Elantra, Verna, Scorpio, Innova, Safari in India) that work only beyond a certain RPM (typically 2500).

For e.g. you could find that you are getting your max power at about 4000 RPM, so you could accelerate to that RPM or shift gears down to reach it and then shift up again to maintain it to get your maximum speed.

Answer 5

A tachometer gauges the speed of rotation of a shaft or disk (from greek: tachos = speed, metron = measure), as in a motor or other machine. The device usually displays the rate of revolutions per minute on a calibrated analog dial, but digital displays are increasingly common. Tachometers fitted to cars, aircraft, and other vehicles typically have markings indicating a safe range of speeds at which the engine may be operated. Prolonged use at high speeds may cause excessive wear and other damage to engines. On an analog tachometer this maximum speed is typically indicated by an area of the gauge marked in red, giving rise to the expression of "redlining" an engine - i.e. running it at (dangerously) high speed. The red zone is superfluous on most modern cars, since engine speed is electronically limited to prevent damage (see rev limiter).

In older vehicles, the tachometer is driven by the pulses from the low tension (LT) side of the ignition coil, whilst on others (and all diesel engines, which have no ignition system) engine speed is determined from the alternator output voltage, which is directly proportional to engine speed. With modern engine management systems found in present day vehicles, the tachometer is driven directly from the engine management ECU.

Answer 6

Well, if you didn;t find use for a tacho for so long, i hate to say it, but you missed out on a lot.

The tachometer is an instrument that one could consider far more important than even a speedometer.

The tachometer is used to measure the speed of the engine crankshaft(NOT CAMSHAFT, cam spins at half the revs my dear).

Inws, coming back to the question, the internal combustion engine(ICE) develops less torque at low revs(engine speed) and max torque at mid-range and low torque at high revs, but it develops power almost proportional to the speed of the engine.

Hence, you need to determine shift point in order to maximise engine utilization, maybe for cruising, or for going really fast, or climbing a hill/going down one.

When one needs to go really fast, one must rev hard, you will feel that your acceleration will almost be proportional to how late you shift. So, you rev and rev, but you will come across a hard judder at the top of the rev band. That's called rev limiter. You're not supposed to rev that hard.

Next up, while cruising around town, if the engine revs drop below 1000rpm(on most cars) you will face jerks and even a potential stall, that's the lowest revs at which the engine develops adequate torque to sustain motion, you're not supposed to go below that if you want your engine to last.

So, in the middle of these two extremities you will find the cruising range, where the engine performs most efficiently.

So, keep a watch on both the tacho and your right foot if you want to get the max out of your car or bike for that matter.


ooh, i almost missed out, when you are climbing up or going down slopes, or steep roads like the ones you will find in ghat sections, maintain a easy engine beat, around mid range to keep the engine temp cool and your brakes in good shape as well..

even here, the tacho comes in handy.....

any further clarifications?? ;)

Answer 7

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Sounds like the tachometer, which measures your engine's revolutions per minute, (rpm). They are generally the same size as your speedometer...

Answer 8

for most folks, a tach is just a sporty dial on the dash. if you have a small engine, you can learn where your power range is on your engine so you can shift to the correct gear for the power range when you need power for example: climbing hills. If you know that your engine needs to be running at 2800 to get all the accelleration and power you need, then you can down shift to a gear that gets you there so when you want to pass going uphill, you have a better idea that you can make it.

Answer 9

what is dose is it tells you when to Shift in a manual trans car
and it tells you how much tork is on the motor if u get to high the motor could blow revolutions per minute thats what a tachometer is

Answer 10

If you had a Manual transmission, it'd be much more important. To you, it doesn't mean anything unless your car isn't working properly just take a glance at it while your driving.