Motorcycle exhaust volume

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#1760664 11-Apr-2017 11:59

TimA:

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Speaker in the windshield makes them sound pretty dandy! When the speaker breaks or become unstuck (Common) it will sond like a broken record.
You do get a wee bit of popping and cackling and a slight raise in volume from the outside but not as much as in the cabin.

You want to hear a RS3 in Sport + from the outside, Christ.....

I don't believe it's a speaker/electronic as some cars use, it's an optional "sport exhaust" system, the switch alters tuning in the exhaust system. The switch merely says "Sport", everything else seemed adjustable - PDK shifting, suspension settings etc, I wondered what the hell it did, as the car interior is otherwise quite sparse of switches and buttons. I'm amused somewhat that the most obvious button to "switch driving modes" actually seems to do nothing at all except alter the sound of the exhaust, then that this should define "sport", presumably "non-sport" just means "quieter".

The mechanism operated by the right foot - often called the "loud pedal" scares me in cars like that (and no doubt the RS3). I'm too old for that kind of crap - at least on the road. If I used it, I'd probably lose my license for so long I'd never get it back. Yet not using it when you've got it just seems so utterly pointless.

Geektastic

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#1760665 11-Apr-2017 12:03

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Probably like the "M" button on an M5...! M for 'Mental'.

It changes throttle response, suspension and so on - probably does the same in the souped up Beetle your friend bought!

In my Land Rover there is a control that selects pre-set off road programs (grass/gravel, mud/ruts, rocks, sand) and it changes a whole lot of things quite noticeably - throttle response, traction control response, suspension height, differential locking behaviour, gearbox ratio etc.

Coil

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#1760671 11-Apr-2017 12:45

Fred99:

TimA:

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Speaker in the windshield makes them sound pretty dandy! When the speaker breaks or become unstuck (Common) it will sond like a broken record.
You do get a wee bit of popping and cackling and a slight raise in volume from the outside but not as much as in the cabin.

You want to hear a RS3 in Sport + from the outside, Christ.....

I don't believe it's a speaker/electronic as some cars use, it's an optional "sport exhaust" system, the switch alters tuning in the exhaust system. The switch merely says "Sport", everything else seemed adjustable - PDK shifting, suspension settings etc, I wondered what the hell it did, as the car interior is otherwise quite sparse of switches and buttons. I'm amused somewhat that the most obvious button to "switch driving modes" actually seems to do nothing at all except alter the sound of the exhaust, then that this should define "sport", presumably "non-sport" just means "quieter".

The mechanism operated by the right foot - often called the "loud pedal" scares me in cars like that (and no doubt the RS3). I'm too old for that kind of crap - at least on the road. If I used it, I'd probably lose my license for so long I'd never get it back. Yet not using it when you've got it just seems so utterly pointless.

You will find all the new high performance line up from the VAG group have speakers in their windscreens and or a system that amplified the in cabin noise. Golf R, RS Audi's, Porsche's.
The extent of how they work is limited between them all, The SQ5 Audi has a speaker system that makes it rumble like a V8 even though its a V6 diesel.

In the Porsche it is more subtle than the Golf and Audi's and they do alter the physical exhaust system with muffler valves. But valves in your muffler isnt a new technology. My ancient BMW has one of them.
The "Sport exhaust system" is a 6-10K factory upgrade. Doesnt do much apart from make it cackle clearly and lift the idle and low RPM noise to that of the sport button would on a factory exhaust, If you put it in sport with the sport exhaust they become evil. Outside and in!

I used to sell parts for VAG cars.

Refer to this image.

Coil

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#1760678 11-Apr-2017 12:57

Geektastic:

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Probably like the "M" button on an M5...! M for 'Mental'.

It changes throttle response, suspension and so on - probably does the same in the souped up Beetle your friend bought!

In my Land Rover there is a control that selects pre-set off road programs (grass/gravel, mud/ruts, rocks, sand) and it changes a whole lot of things quite noticeably - throttle response, traction control response, suspension height, differential locking behaviour, gearbox ratio etc.

You will find the Landie will actually function in these different settings as described versus a marketing campaign for buttons.

Fred99

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#1760709 11-Apr-2017 13:24

TimA:

Fred99:

TimA:

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Speaker in the windshield makes them sound pretty dandy! When the speaker breaks or become unstuck (Common) it will sond like a broken record.
You do get a wee bit of popping and cackling and a slight raise in volume from the outside but not as much as in the cabin.

You want to hear a RS3 in Sport + from the outside, Christ.....

I don't believe it's a speaker/electronic as some cars use, it's an optional "sport exhaust" system, the switch alters tuning in the exhaust system. The switch merely says "Sport", everything else seemed adjustable - PDK shifting, suspension settings etc, I wondered what the hell it did, as the car interior is otherwise quite sparse of switches and buttons. I'm amused somewhat that the most obvious button to "switch driving modes" actually seems to do nothing at all except alter the sound of the exhaust, then that this should define "sport", presumably "non-sport" just means "quieter".

The mechanism operated by the right foot - often called the "loud pedal" scares me in cars like that (and no doubt the RS3). I'm too old for that kind of crap - at least on the road. If I used it, I'd probably lose my license for so long I'd never get it back. Yet not using it when you've got it just seems so utterly pointless.

You will find all the new high performance line up from the VAG group have speakers in their windscreens and or a system that amplified the in cabin noise. Golf R, RS Audi's, Porsche's.
The extent of how they work is limited between them all, The SQ5 Audi has a speaker system that makes it rumble like a V8 even though its a V6 diesel.

In the Porsche it is more subtle than the Golf and Audi's and they do alter the physical exhaust system with muffler valves. But valves in your muffler isnt a new technology. My ancient BMW has one of them.
The "Sport exhaust system" is a 6-10K factory upgrade. Doesnt do much apart from make it cackle clearly and lift the idle and low RPM noise to that of the sport button would on a factory exhaust, If you put it in sport with the sport exhaust they become evil. Outside and in!

I used to sell parts for VAG cars.

Refer to this image.

That's it - but that's on the intake - not the exhaust. Mechanical - not electronic (as in a "speaker"). Explains why there's more (induction) noise / howl inside when it's turned on, but doesn't explain the exhaust crackle and pops on shifting and overrun. You hear that very clearly with the window down or sunroof open, as well as a slightly angrier "bark" from the exhaust when blipping the throttle in neutral - so they're doing something else as well as opening the valve to the diaphragm.

Coil

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#1760714 11-Apr-2017 13:51

Fred99:

TimA:

Fred99:

TimA:

Fred99:

A friend of mine bought a new Porsche recently, has a "sport" button on the console, which as far as we could tell, does nothing at all except alter the exhaust note so it sounds harsher and crackles and pops on overrun. Quite noticeable from the inside, I guess also from the outside.
When I was about 8, we'd jam a piece of stiff cardboard around the forks of our bicycles, tensioned with a piece of string, so it'd flap against the spokes making a racket as you rode down the road.
Boys with their toys.

Speaker in the windshield makes them sound pretty dandy! When the speaker breaks or become unstuck (Common) it will sond like a broken record.
You do get a wee bit of popping and cackling and a slight raise in volume from the outside but not as much as in the cabin.

You want to hear a RS3 in Sport + from the outside, Christ.....

I don't believe it's a speaker/electronic as some cars use, it's an optional "sport exhaust" system, the switch alters tuning in the exhaust system. The switch merely says "Sport", everything else seemed adjustable - PDK shifting, suspension settings etc, I wondered what the hell it did, as the car interior is otherwise quite sparse of switches and buttons. I'm amused somewhat that the most obvious button to "switch driving modes" actually seems to do nothing at all except alter the sound of the exhaust, then that this should define "sport", presumably "non-sport" just means "quieter".

The mechanism operated by the right foot - often called the "loud pedal" scares me in cars like that (and no doubt the RS3). I'm too old for that kind of crap - at least on the road. If I used it, I'd probably lose my license for so long I'd never get it back. Yet not using it when you've got it just seems so utterly pointless.

You will find all the new high performance line up from the VAG group have speakers in their windscreens and or a system that amplified the in cabin noise. Golf R, RS Audi's, Porsche's.
The extent of how they work is limited between them all, The SQ5 Audi has a speaker system that makes it rumble like a V8 even though its a V6 diesel.

In the Porsche it is more subtle than the Golf and Audi's and they do alter the physical exhaust system with muffler valves. But valves in your muffler isnt a new technology. My ancient BMW has one of them.
The "Sport exhaust system" is a 6-10K factory upgrade. Doesnt do much apart from make it cackle clearly and lift the idle and low RPM noise to that of the sport button would on a factory exhaust, If you put it in sport with the sport exhaust they become evil. Outside and in!

I used to sell parts for VAG cars.

Refer to this image.

That's it - but that's on the intake - not the exhaust. Mechanical - not electronic (as in a "speaker"). Explains why there's more (induction) noise / howl inside when it's turned on, but doesn't explain the exhaust crackle and pops on shifting and overrun. You hear that very clearly with the window down or sunroof open, as well as a slightly angrier "bark" from the exhaust when blipping the throttle in neutral - so they're doing something else as well as opening the valve to the diaphragm.

Yep, Thats an example of one of the ways they enhance the in cabin noise.

They do overrun the engine to get cackles and play with the timing and the DSG/PDK/S-Tronic responsiveness etc. Thats all adjustable on the software. BMW have a nice little percentage slider that says "Exhaust cackles" on the 335I E9x if you modify the ECU.

Sometimes there are valves that open bypass pipes in the mufflers, like the Porsche would have had. The rest is always assisted by software and a form of speaker or diaphragm operated by intake vacuum.

You understand the concept of what im explaining. The detail of how they get every other bit to come into play is irrelevant given it still has in cabin enhancements.

Coil

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#1760715 11-Apr-2017 13:54

Here is Audi's exhaust speaker.

Sorta off topic now :)

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#1761716 11-Apr-2017 14:59

TimA:

nas:

At least you don't have a neighbour that warms his bike up every morning at 7:45am, just makes my day /s

He isnt really doing anything wrong, Id hate for him to ride off and potentially damage his engine from it being too cold to rev or cause it to wear out faster shortening the engines life span.
Cant really blame them. But there is a tollerence. Like the ones who use old loud 2 stroke lawn mowers on a sunday at 7AM sharp.
Had one neighbor do that until i got a sprinkler and pointed it over the fence at his lawn and turned it on while he was mowing. Worked a treat.

It's a new bike so I very much doubt you need minutes to warm it up, seconds at most

Coil

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#1761735 11-Apr-2017 15:50

nas:

TimA:

nas:

At least you don't have a neighbour that warms his bike up every morning at 7:45am, just makes my day /s

He isnt really doing anything wrong, Id hate for him to ride off and potentially damage his engine from it being too cold to rev or cause it to wear out faster shortening the engines life span.
Cant really blame them. But there is a tollerence. Like the ones who use old loud 2 stroke lawn mowers on a sunday at 7AM sharp.
Had one neighbor do that until i got a sprinkler and pointed it over the fence at his lawn and turned it on while he was mowing. Worked a treat.

It's a new bike so I very much doubt you need minutes to warm it up, seconds at most

New bikes unfortunately cant defy physics. Still takes about 1-2 minutes to get a bike to safe temperature then a further 5-10 minutes before its at operating temperature where you can rev it and use the power.

Varies between bikes but thats the general rule.

SepticSceptic

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#1761750 11-Apr-2017 16:01

sigh, all this noise pollution, and we are expected to tolerate this with ever smaller properties and tighter living conditions.

Gets to the point you cant even watch a movie with a half decent sound system without upsetting the neighbours.

Coil

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#1761752 11-Apr-2017 16:05

SepticSceptic:

sigh, all this noise pollution, and we are expected to tolerate this with ever smaller properties and tighter living conditions.

Gets to the point you cant even watch a movie with a half decent sound system without upsetting the neighbours.

Try enjoying a social BBQ with friends without noise control showing up twice.
Once had a Saturday BBQ where our voices were to loud... Good luck taking that from us council!

Sidestep

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#1761771 11-Apr-2017 16:45

(O/T & ghost story)

Knew a Ducatti riding dude who was killed in an accident. Had a neat old Darmah 900 - on a still evening we could hear him coming 5km away.
We were all devastated. Then, months later, late at night, his girlfriend began to hear his bike coming down the valley, up the hill to her place - then it would vanish. She'd look outside but no one was there.

We stayed up there a few times - drinking beer in her garage and waiting, but it only seemed to happen when she was there alone.

In the end we caught the "ghost". He was a nurse, who lived further down the road. When on night shifts he'd ride his old unmuffled Guzzi to work.
On his way home in the early morning he'd shut it off just before he crested the ridge, then freewheel the several km downhill to his house, up his driveway and into his garage in neutral, so as not to wake his wife or neighbours.

SepticSceptic

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#1761778 11-Apr-2017 16:55

TimA:

SepticSceptic:

sigh, all this noise pollution, and we are expected to tolerate this with ever smaller properties and tighter living conditions.

Gets to the point you cant even watch a movie with a half decent sound system without upsetting the neighbours.

Try enjoying a social BBQ with friends without noise control showing up twice.
Once had a Saturday BBQ where our voices were to loud... Good luck taking that from us council!

Yeah, well that is ridiculous - sounds like grumpy neighbours. A social BBQ is one thing, but a rip-snorting knees-up every weekend is another ...

Then again, one could be on shift work, or trying to settle a young child in the early evening. However, those shift workers and parents with young children who are forced to get up at 5am or thereabouts could invoke some pretty awesome retaliation to hung-over neighbours ... Verdi at 5am ?

tdgeek

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#1761814 11-Apr-2017 19:43

nas:

TimA:

nas:

At least you don't have a neighbour that warms his bike up every morning at 7:45am, just makes my day /s

He isnt really doing anything wrong, Id hate for him to ride off and potentially damage his engine from it being too cold to rev or cause it to wear out faster shortening the engines life span.
Cant really blame them. But there is a tollerence. Like the ones who use old loud 2 stroke lawn mowers on a sunday at 7AM sharp.
Had one neighbor do that until i got a sprinkler and pointed it over the fence at his lawn and turned it on while he was mowing. Worked a treat.

It's a new bike so I very much doubt you need minutes to warm it up, seconds at most

Warming up means running the engine at idle. I dont warm mine, I exit the garage, start it, close the door then potter off, thats also warming up.

tdgeek

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#1761817 11-Apr-2017 19:46

Sidestep:

(O/T & ghost story)

Knew a Ducatti riding dude who was killed in an accident. Had a neat old Darmah 900 - on a still evening we could hear him coming 5km away.
We were all devastated. Then, months later, late at night, his girlfriend began to hear his bike coming down the valley, up the hill to her place - then it would vanish. She'd look outside but no one was there.

We stayed up there a few times - drinking beer in her garage and waiting, but it only seemed to happen when she was there alone.

In the end we caught the "ghost". He was a nurse, who lived further down the road. When on night shifts he'd ride his old unmuffled Guzzi to work.
On his way home in the early morning he'd shut it off just before he crested the ridge, then freewheel the several km downhill to his house, up his driveway and into his garage in neutral, so as not to wake his wife or neighbours.

I have a mate with a Harley (ugh). Slow, low HP, loud, but I guess its a Harley and I guess thats cool I guess. Where he was living he would not ride it to work as he had to ride down a drive. Its loud. But thats all it is, loud. Silly.

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