Many thanks for this info, which is very useful for checking the position of my flap valve on start-up.
Macan S Exhaust Drone
OPC Portsmouth thoroughly checked my exhaust system today, and no faults were found, with the flap valve working correctly . I must admit that the drone I first experienced shortly after I bought the car appears to have diminished, so the exhaust noise now is barely audible at motorway cruising speeds, so I’m happy
Allan
2023 Macan S in Crayon
2023 Macan S in Crayon
Ours was horrible to start with and got better with timeAllanG wrote: ↑Tue Dec 08, 2020 5:59 pm OPC Portsmouth thoroughly checked my exhaust system today, and no faults were found, with the flap valve working correctly . I must admit that the drone I first experienced shortly after I bought the car appears to have diminished, so the exhaust noise now is barely audible at motorway cruising speeds, so I’m happy
On order
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
So, Allan, from the inspection, can you say what position the flap should be in at the various stages?
E.g.
1. Cold, in Drive mode, before start-up, it's open?
2. Warm engine, in Drive mode, it's open?
3. Warm engine, in Sport, it's shut?
Thanks if so,
Graeme.
E.g.
1. Cold, in Drive mode, before start-up, it's open?
2. Warm engine, in Drive mode, it's open?
3. Warm engine, in Sport, it's shut?
Thanks if so,
Graeme.
Macan S, MY16 64k mls, dechromed, PASM, BiXenons, PDLS+, heated 18way sports hardbacks, 20" SportDesign rims/PZeroNeros.
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
Hi Graeme,
After speaking with the OPC workshop supervisor, this is my basic understanding of how the flap valve operates:-
1. Cold start, i.e. first start of the day - flap valve is closed
2. Urban & motorway driving keeping revs low - flap valve closed
3. Urban & motorway driving with increased revs - flap valve will open
4. Using the ‘Sport’ button - flap valve will be open
The valve itself is electrically operated, and gets it’s signal from an engine vacuum sensor.
Therefore, it appears that as the revs increase, the flap valve will open to improve exhaust gas flow and, hence, the exhaust sound will increase.
Hope this helps.
Cheers, Allan
After speaking with the OPC workshop supervisor, this is my basic understanding of how the flap valve operates:-
1. Cold start, i.e. first start of the day - flap valve is closed
2. Urban & motorway driving keeping revs low - flap valve closed
3. Urban & motorway driving with increased revs - flap valve will open
4. Using the ‘Sport’ button - flap valve will be open
The valve itself is electrically operated, and gets it’s signal from an engine vacuum sensor.
Therefore, it appears that as the revs increase, the flap valve will open to improve exhaust gas flow and, hence, the exhaust sound will increase.
Hope this helps.
Cheers, Allan
Allan
2023 Macan S in Crayon
2023 Macan S in Crayon
Many thanks, Allan.
Seems mine's kaputt, then, as I'm a new owner too but never seen it shut yet !
Fortunately, I must say, it's open at least, as it has no problem putting a spurt on when I floor it.
I'll need to do some investigating / make further enquiries, it seems, so I can get to the bottom of it...
Thanks again, Allan. Happy motoring and keep well.
Seems mine's kaputt, then, as I'm a new owner too but never seen it shut yet !
Fortunately, I must say, it's open at least, as it has no problem putting a spurt on when I floor it.
I'll need to do some investigating / make further enquiries, it seems, so I can get to the bottom of it...
Thanks again, Allan. Happy motoring and keep well.
Macan S, MY16 64k mls, dechromed, PASM, BiXenons, PDLS+, heated 18way sports hardbacks, 20" SportDesign rims/PZeroNeros.
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
Ex:
Alfa Brera S Prodrive
Porsche 911 C4 factory-lowered(M033)
Porsche968 Sport
Audi S4 quattro Avant biturbo
325iTouring, 528SE
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