randr

The attached graphs represent the sound captured from two different Porsche sports cars (frequency (Hz) Vs amplitude). One is NA the other is turbocharged.

The microphone was placed directly behind the pipes at a distance of 60cm. (not above or to the side).

Both cars are equipped with PSE. The cars were at idle with PSE valves open.

The red line shown on the right hand graph is the trace of the left hand graph. The scales are the same.

Take your pick ladies and gentlemen

Soul Performance

Quite interesting data there, I would be curious to see how they compare through different areas of the RPM band as well. I assume since the graph on the right has a higher frequency that it is the naturally aspirated car?

Are the both "S" models?

trayvon

One should "take their pick" by driving both. People have preferences that are vastly different from one another.

I remember looking at numbers and charts and thinking that the sound wouldn't be that different, and then test driving a 991.1 S and 991.2 S, both with PSE, back to back. I found the sound difference astonishing, the 991.2 sounded very, very quiet and boring. Others, on the other hand, find the 991.1 to be needlessly loud, and prefer the turbo sound.


Auditory pleasures is much more complex than average frequency and amplitude. Some people like rap and some would rather listen to a classical symphony.

Definitely an interesting comparison, but I feel like this is simply "entertaining" information to toy with, not something anyone should use to make a decision. Maybe that goes without saying and I am reading your post incorrectly


P.S. I would think this data would be more interesting if taken from inside the cabin, no? If I am driving the car, I'd probably care most about the sound of the engine from inside the car. Personally, if there was no difference between the .1 and .2 from INSIDE the car, I wouldn't care what it sounded like outside.

randr

The image on the left is from the NA and the image on the right is from the .2.

The biggest surprise to me was the extended higher frequency range exhibited by the .2.

I will try this from inside the cabs at different rpm. I think thats where it'll get interesting.

Why? simply for interests sake -

Dewinator

Well in the interest of science as well as brand comparison I decide I should perform the same measurement on my 360 Spider.

reuben991

In theory the 991.2 should sound better in the cabin because it now has two sound symposers.

trayvon

I don't believe that is true in theory or in practice. The flaw in that logic lies in the fact that the engines are different. Two sound symposers may not be able to make up for the difference in noise coming from the engine itself.


And in practice, again this was only a short (20ish min) test drive, but the 991.2 was much quieter in the cabin than the 991.1.