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Sound Levels from Edmunds test track review

At long last, real noise measurements!

Db @ Idle: 36.4
Db @ Full Throttle: 62.5
Db @ 70-mph Cruise: 61.7

I LOVE that it's essentially the same at full throttle as it is cruising!

What is idle?

This makes zero sense to me.
As DouglasR said/wrote what is idle. What are they measuring? There is no engine.

Idle may be the wrong moniker, since nothing is moving, but here is a point of reference:

A library is typically 45dB.

That cabin is seriously quiet.

They are using their standard terminology for ICE cars; they mean when the "engine" is on and the car is not moving. You can hear a mouse squeak at that level.

I found this list of quietest cars: http://sniperslaststand.blogspot.nl/2008/10/quest-for-quietest-car.html

The Model S would be in 4th place, just below a Lexux 600 Lh or Rolls Royce Phantom (70 mph cruise). Not bad at all...

@george210: of course there is an engine, even if it is not rotating when the car is at "idle" (which isn't a stretch to interpret as: standing still but fully ready to drive off instantly).

But more importantly, ears are ears, and essentially, a car is a car, so it makes _perfect_ sense to use the same measuring technique for all cars, regardless of the engine type.

pebell;
No, the MS has a motor. An engine generates power. A motor uses it. ;p

Brian:
So why does one say solid rocket motor but liquid rocket engine?

Brian H--
When I was a kid I used the Encyclopaedia Brittanica. In yesterday's modern world, I used the internet and google. Today, I use Brian H to help me with my grammar, spelling, etc. and enlighten and inform me about things that I should know and don't. In all seriousness, if someone had asked me the difference between an engine and a motor I wouldn't have a good answer. I really like yours. Is is right? If not, don't tell me.

Here is something everyone should know about motors,

“Motors run on smoke. When the smoke comes out, they’re broke.”

niceguy --

Idle simply means at rest. It's appropriate usage for both a car with an ICE and a car that is all electric when they aren't moving.

However, I do have a problem with Edmunds' displacement spec. Where did that come from? Displacement is uniquely an ICE piston travel volume parameter. It is bogus to use displacement as a comparison to an electric motor that doesn't have pistons.

I used an app called Decibel 10th, went into a bathroom and shut the door, held my breath, and got readings of 37-38 dB. Breathing made the reading jump 2-3 dB, as did the slightest gurgle from my stomach.

I think 36 dB is the sound of ghosts talking to each other, or dark matter running into things......

They don't mention displacement anywhere I don't think...and I wasn't the one questioning the use of the term idle! :-)

Who says "rocket motor"? They know not of what they speak.

Next month, I will finally enjoy

real motoring

, instead of the faux motoring of my last 40 years!

I've been following the long term review of the MS they bought--seems to b an objective report and nice outside look to validate all the joy and anticipation on these threads!
I know I'm excited waiting on my vin to appear n email--turns out my wife's boss and I reserved at same time last December! His just arrived last wk with performance pkg so will compare-- I hope to be flying out in 3 weeks to the mothership and drive mine back to PHX!

Engine
Motor
Both transform energy
One from chemical to mechanical
The other from electrical to mechanical
Or not?

I like this definition that I came across while googling:

  • A motor is a machine that converts other forms of energy into mechanical energy and so imparts motion.
  • An engine is a motor that converts thermal energy to mechanical work.

So an engine is a specific type of motor. That's why it's not incorrect to speak of a motorboat, or a motorcar, or a motor speedway, even if the boat or car is clearly powered by combustion.

Note that if there's no combustion, there's no engine. Purely electric cars don't have engines.

Addendum: I pasted that entire previous post, but while I like the definitions of motors and engines, I do not subscribe to the comment that if there is no combustion, there is no engine. There are many motors that convert heat to motion that do not use combustion, and they are indeed called engines too.

@Brian H

A friend of mine is an aerospace engineer and I've heard him use the term "rocket motor". It surprised me too, but I assumed (and still do) that he knows more about it than I, so I'm comfortable it's a legit term.

He's a lying outlier. >:(

Or is that outliar? ?;\

I subscribe to Aviation Week and Space Technology and I believe it is always "solid rocket motor" vs "liquid rocket engine."

I think in this case it has to do with the mechanical complexity of the liquid vs solid.

Actually, the usual term is "booster", unless it's the main rocket. Then it's "solid rocket engine" according to NASA: http://www.grc.nasa.gov/WWW/k-12/airplane/srockth.html

I'm sure Elon could help us with that answer, too. He as all motors covered!

" An engine generates power. A motor uses it."

Sounds neat.

Somebody should tell the Ford Motor Company and General Motors.

And all those motorcycle riders.

Sounds awesome on paper, but Car and Driver came with quite different numbers:

INTERIOR SOUND LEVEL
IDLE ................ 35 dBA
FULL THROTTLE ....... 70 dBA
70-MPH CRUISING ..... 70 dBA

Whose numbers are right? I don’t know, but 70db and 62db is a huge difference! 62db is very quiet for a car, 70db at 70 mph cruise, one of the noisiest. Edmunds and Car and Driver numbers need to be verified with further testing to find the truth.

I hope they will not erect a law that requires EV to generate artificial noise one day.

Oh forgot to mention don't feed the troll.

@blurb, please link to these results. I don't believe C&D posted sound results. The only other numbers I have seen were a head to head with the Panamera and the Tesla was far quieter with these numbers:

2012 Tesla Model S
Db @ Idle: 35.4
Db @ Full Throttle: 64.2
Db @ 70 mph Cruise: 61.2

2013 Porsche Panamera GTS
Db @ Idle: 50.5
Db @ Full Throttle: 77.0
Db @ 70 mph Cruise: 64.5


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