AUTONET TV

Tacky or Techie? The Tachometer.

There's a gauge that many vehicles have that says RPM on it.  And there are a lot of people who either don't pay any attention to it or don't even know what it is. Here's why it's a good gauge to know about.

It's called a tachometer, and that "RPM" label means it is measuring how many revolutions per minute (RPM) the engine is turning.  Automotive experts know that a vehicle's engine can be damaged if it turns too fast (revving too high) or too slowly ("lugging" the engine).

A tachometer (sometimes called a tach) is almost a "must-have" gauge for vehicles with a manual transmission; the driver has to manually change gears; the tach helps the driver know when revolutions are in the optimal range.

Some say you don't need a tachometer if you drive a vehicle with an automatic transmission. It's true that most drivers of automatics don't even look at it.  But there are times when paying attention to the tach can help you prevent an expensive repair.

Here's a good example.  Manufacturers now build many of their automatic transmission vehicles with shift paddles.  They let you shift gears without a clutch. That's manual shifting, and drivers need to know they're not revving the engine too high. That's where the tachometer comes in, since it shows you visually when you are in the red zone (RPM too high).

Here's another way the tach can help you: fuel economy. Generally speaking, the lower the RPM, the better the fuel economy. It's not good to go too low, of course, and the tachometer will help you find that spot of maximum efficiency.

You can also spot problems by paying attention to the tach.  When your vehicle stays in first gear longer than usual (higher reading on the tach), then the RPM dip lower than usual after shifting, it may be that your vehicle's transmission is skipping a gear.  Plus, if your vehicle's RPM go up but your speed doesn't, it could mean your transmission is slipping.  Either situation should be checked by a trained technician.

If your commute takes you down some long grades, you might like to put your vehicle in a lower gear to help slow down the car (and not burn up the brakes). Having a tachometer keeps tabs on when your engine is revving too high.

So, consider the tachometer a "bonus" gauge.  It's one more helpful assistant that can help you spot and prevent problems in your vehicle.

The Engine Gets a Boost (Turbocharged Engine Maintenance)

If someone told you that your vehicle could have the same power but with a smaller engine, wouldn't that sound like great idea? Just think, a smaller engine would save you money at the gas station and you'd still get the same horsepower.

The technology to do just that has been around for a long time. It's called a turbocharger.

Race cars and other performance vehicles have been using turbochargers for years. It gives them a power boost without the need of a bigger engine, saving them fuel and pit stops.

Automakers have offered turbo gasoline and diesel engines for years, but there were problems with durability. Plus drivers had to make some driving adjustments with the way turbos delivered power. Newer turbos, though, have been vastly improved, and manufacturers are including them in more models. For example, Jeep offers its 2019 Cherokee with a choice of two engines that each make about 270 horsepower. One is a 4-cylinder turbocharged engine and the other is a 6-cylinder conventional gasoline engine. The general rule of thumb is: the fewer the cylinders, the better the fuel economy.

A turbocharged vehicle uses a turbine that is turned by exhaust gas. That compresses air that goes into the engine, which then allows it to use more fuel per second, increasing power. One advantage of a turbo is that it is only engaged when the driver demands more power from the engine by stepping on the throttle harder.

One thing to remember, though, is that turbocharged engines have additional parts and are more complex. That means they can be more expensive to maintain. The upside? You'll likely save fuel.

Like any complex machine, it's important that you maintain your turbo vehicle so it will give you more years of service. Triple A Automotive technicians are trained to inspect and service the systems associated with a turbo engine. If you already drive a turbocharged vehicle, keep up your regular maintenance schedule to get the longest life and performance out of it.

Because of the advantages these powertrains offer, turbo engines are definitely here to stay.

Triple A Automotive
972 Barstow Suite B
Clovis, CA 93612
(559) 299-9300
http://www.tripleaautomotive.com