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Sound Levels from Edmunds test track review

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!

DouglasR | 24 aprile 2013

What is idle?

george210 | 24 aprile 2013

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

Mark K | 24 aprile 2013

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.

riceuguy | 24 aprile 2013

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.

Andre-nl | 25 aprile 2013

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...

pebell | 25 aprile 2013

@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.

Brian H | 25 aprile 2013

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

larryh | 25 aprile 2013

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

info | 25 aprile 2013

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.

Roddy | 25 aprile 2013

Here is something everyone should know about motors,

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

mallynb | 25 aprile 2013

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.

Getting Amped Again | 25 aprile 2013

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......

riceuguy | 25 aprile 2013

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

Brian H | 25 aprile 2013

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

prytog | 25 aprile 2013

Next month, I will finally enjoy real motoring, instead of the faux motoring of my last 40 years!

DrB | 25 aprile 2013

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!

gianni.terragni | 26 aprile 2013

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

pebell | 26 aprile 2013

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.

pebell | 26 aprile 2013

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.

mrspaghetti | 26 aprile 2013

@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.

Brian H | 27 aprile 2013

He's a lying outlier. >:(

Brian H | 27 aprile 2013

Or is that outliar? ?;\

larryh | 27 aprile 2013

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.

Brian H | 27 aprile 2013

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

Rubik | 28 aprile 2013

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

JaneW | 23 maggio 2013

" 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.

blubrd67 | 23 maggio 2013

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.

carlk | 23 maggio 2013

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

carlk | 23 maggio 2013

Oh forgot to mention don't feed the troll.

riceuguy | 23 maggio 2013

@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

riceuguy | 23 maggio 2013

Correction, they did publish those numbers (http://media.caranddriver.com/files/2013-tesla-model-complete-specs.pdf). The difference is in the performance model and the tires. The performance is appreciably louder, primarily from road noise with the 21s.

blubrd67 | 24 maggio 2013

Did you find Car and Driver doing Tesla/Panamera comparison? I dind't find anything like that. And the Edmunds numbers were also done with 21" wheels, but seem less believable than Car and Driver numbers after my test drive.

JacksonB | 7 febbraio 2014

So my cabin noise measures at 92+ decibels at > 70 mph. I have a new P85+. This has got to be unusual. Compared to my Lexus, it's like an F15 is flying overhead. Is it just the 21" tires? Will it go away if I switch to 19"? Or is it a problem that the SC needs to address?