[synergize]

No Sh__t! No tunnel needed! The AWE exhaust I have is straight pipes (no mufflers) so the Brap Fart sound is "in your face", just driving alongside Armco barriers or a wall it is crazy loud when it happens! That is why I started this thread, wanted to understand what causes it... so I can better appreciate it!

Some guys got more Brap than others!

 

[grim]

The "backfires" as Porsche call them in the owner's manual are only active in Sport mode or in Normal if Sport Exhaust is activated (for cars with PSE). I have PSE in my car (14 C4S) and there are NO pops/crackles/backfires in Sport plus mode at all. In normal mode with PSE switched off, there are also no such noises. However, activating PSE in Normal mode brings along these sounds and changes the character of the sound significantly. This is a much quieter car in normal mode; almost too quiet. Personally I like these sounds and I feel they add to the excitement of the whole experience. However, if you don't like them, then you need to avoid Sport mode if you don't have PSE, and if you do have PSE then you can switch it off even in Sport mode. This should be the same for the Macan, perhaps someone can chime in and confirm!

Others have already said that the noise appears without PSE.

I have PSE in my car (14 C4S) and there are NO pops/crackles/backfires in Sport plus mode at all. In normal mode with PSE switched off, there are also no such noises.


If this is true, something is wrong. There are six levels of sound, with PSE in a Carrera. Each one different in tone and sound level. ALL of them have the burps and pops, but to different extents. As you progress from off to Sport to Sport +, they get louder. With PSE on, they get deeper in tone. If you have NO pops/crackles/backfires in Sport plus mode at all then something is wrong. Its exactly at that time not only is it loudest but the most annoying.

Back off the throttle with PSE on and sport + and its embarrassing, sounding like like little kid going "zoom zoom". And its made by dumping raw fuel into the exhaust to simulate the sound of a racing car. ... In other words .... ITS FAKE. At least Porsche doesn't use the speakers like BMW does and the sound is physical sound, but its fake sound.

Even worse, if you have a C4S, is the magic sounds coming, come from the boxer engine, not the mufflers. Mufflers, although the sound is made in a certain way designed by Porsche, and there are articles explaining this, are just muffled sounds of the engine. Its that NA flat 6 engine that makes the marvelous wail, and with the mufflers on loud, it tends to mask the Boxer mechanical engine sounds.

I think if you get no burps, and pops, particularly if backing off the gas, something isn't right there.

 

[Maitre_Absolut]

So the PDK will NOT "fart" in normal mode with PSE off, in cars that HAVE PSE, but it WILL 'fart" in normal mode in cars that DON'T HAVE PSE at all? That doesn't make sense to me.

I think some people are exaggerating what they call a "fart".

 

[DH95B]

So the PDK will NOT "fart" in normal mode with PSE off, in cars that HAVE PSE, but it WILL 'fart" in normal mode in cars that DON'T HAVE PSE at all? That doesn't make sense to me.

My Turbo "Brap"s in all drive and exhaust settings under quick acceleration - doesn't have to be full throttle.

 

[Thunder]

My humble S braps under acceleration in standard or sport. It's just more noticeable in sport under aggressive acceleration.

 

[Rapido1]

Want more Brap? Get an AWE Touring exhaust system installed. Gurgles, farts and braps galore! Especially in Sport mode.

 

[MacWhte]

@grim, but a C4S is not a turbo-charged car and so it is true that there are no "braps" or "farts". In turbo-charged cars, that sound is produced by the wastegates (exactly as they are titled).

And when there are "gurgles" in a normally aspirated car, those sounds are not exactly (but similar to) a fuel "dump" -- it is because excess gas is burning but does so without an actual need for that fuel. The car is decelerating and the engine is slowing by the reduced momentum -- there is no true need for fuel yet some fuel is still being fed to the cylinders and thus burns and create those pops because of greatly reduced compression in those cylinders.

Unequivocally, in a Porsche the sounds are not "fake" -- what does happen in some models is that a "sound plenum" is used to redirect some of that exhaust sound back into the vehicle interior. It's not a fake sound, just a process so that the driver gets to hear it better.

 

[grim]

@grim, but a C4S is not a turbo-charged car and so it is true that there are no "braps" or "farts". In turbo-charged cars, that sound is produced by the wastegates (exactly as they are titled).

And when there are "gurgles" in a normally aspirated car, those sounds are not exactly (but similar to) a fuel "dump" -- it is because excess gas is burning but does so without an actual need for that fuel. The car is decelerating and the engine is slowing by the reduced momentum -- there is no true need for fuel yet some fuel is still being fed to the cylinders and thus burns and create those pops because of greatly reduced compression in those cylinders.

Unequivocally, in a Porsche the sounds are not "fake" -- what does happen in some models is that a "sound plenum" is used to redirect some of that exhaust sound back into the vehicle interior. It's not a fake sound, just a process so that the driver gets to hear it better.

If the OP is talking about upshifting, I was talking about decelerating. The deceleration or lifting is artificial. The ECU dumps excess fuel on purpose. That is fake. Its not necessary. Its not piped in over speakers like a BMW but not needed (hence fake). Its programming into the ECU from what I understand. Customers WANT those fake sounds. If he's not talking about lifting, then I agree about the BRAP. Maybe we are talking about two different sounds.

 

[Rapido1]

I am talking about the Brap when accelerating hard on upshifts. The fart between upshifting from one gear to the next.

 

[Hokie]

WHT TGR explained it. Additional unburnt fuel being ignited in the hot exhaust causes it.

Hey Len, we know @WHT TGR. That's not the gas he was referring to.

 

[ABusLux]

When I was in Santa Monica last summer I got a BMW 640i convertible instead of the Mustang GT convertible I had rented... as a guaranteed model! (yes, I was a tourist in LA; any problem? ) In sport mode that car made numerous and very artificial braps ("brap-pap-pap-prrrr" would be a fairly accurate transcryption, I believe) every time I was lifting the foot from the throttle, even at low speeds and low revs (driving up and down those parking houses on the 2nd street ou can't go fast or rev up). Rather than impress me it just made me miss the Macan GTS that was waiting for me back in Geneva.

I love the GTS PSE's braps, farts and pops.

And yes, we all know what kind of gas @WHT TGR was referring to.

 

[jzwu]

Nice! Next time you may get a 911 vert as a guaranteed model. >

 

[COBB Tuning]

Hey guys,

Sorry I'm a little late to the thread with the answer to this but the backfires/pops/farts/braps heard during a gear change is from the engine temporarily reducing torque by means of cutting ignition and fuel delivery. This helps to limit load on the trans when the next gear us engaged.

Here is a quick datalog of what is happening during a 4th->5th gear shift under full throttle that you guys can play with if you like:

datazap.me | jhebbeln | Macan S 4th -> 5th Shift


Thanks!

- Jon

 

[Skinsfan]

Hmmm, I get the "backfires" in normal mode and I don't have PSE. I will admit they are more evident in Sports mode but I can get em in normal mode too.

My Macan S did the same and no PSE either so my new Macan with PSE should be music to my ears.

 

[Louisssss]

I heard this on up and downshifts and it's mesmerizing. I have the S. I was just on the nurburgring and heard it from my car about 100 times slowing down on the turns and accelerating out of them. I was focusing on the road, so didn't look at the tach.

Does anyone know at what rpm does this happen on up shifts when accelerating?

 

[Rapido1]

On my Turbo, it is most pronounced when upshifting when accelerating hard, around 5-6,000 rpm.