Active exhaust question.

R

Ratboiler

New member
Can you guys help please, I have a 2021 car and not sure if the active exhaust is working.
The light comes on on the console to say it's working, but I don't notice any change in the sound. The performance seems fine and when starting I think it's working on start up.
Not having a car to compare against I'm not sure, and it's very quiet against my TVR.
Pushing the active exhaust on and off does not seem to make any difference.
 
At tickover I don't think you'll notice any difference as the valves won't open until you get the revs up. If you pull fuse 15 (in the engone bay fusebox) the valves should be open all the time - that'll tell you if they're working. The newer cars are considerably quieter than the early models, which were LOUD. ;)
 
You can see the exhaust flaps on the V8, which should be open when the engine is off (no vacuum).

As SCM says later cats have been neutered, so the exhaust closes when you move off and only opens properly above 3500 rpm, or if you accelerate hard

With fuse 15 (beige) removed ,from the under bonnet passenger side fuse box, the valves are open permanently. This makes a big difference to the sound. Had mine disconnected for about 18 months. The fuse only goes back in for service/MOT time.
 
Ratboiler said:
Can you guys help please, I have a 2021 car and not sure if the active exhaust is working.
The light comes on on the console to say it's working, but I don't notice any change in the sound. The performance seems fine and when starting I think it's working on start up.
Not having a car to compare against I'm not sure, and it's very quiet against my TVR.
Pushing the active exhaust on and off does not seem to make any difference.
Click to expand...

Mine's a 2021 V8. If you hit the button you should get a deep rumble added to the soundtrack. If you get nothing then something is not right...
 
gasgas said:
you can hear the differance straght away on pushing the button.
Click to expand...


Not on all cars, as SCM says, on some the valves don’t open until the revs increase. I notice a difference if I put it in dynamic mode but not on the switch.
 
On my 2019 I can hear the difference as soon as I press the button. Press the button, put it in Sport & Dynamic give it some gas and then let off, pops and bangs on overrun - as said not as loud as the earlier cars I don't think but loud enough for me.
 
TopCat said:
gasgas said:
you can hear the differance straght away on pushing the button.
Click to expand...


Not on all cars, as SCM says, on some the valves don’t open until the revs increase. I notice a difference if I put it in dynamic mode but not on the switch.
Click to expand...

Same with my MY16 car
 
Seems to be lots of variation in exhaust noise depending on exact model and year.
Before I purchased my 19MY SVR I tried a 18MY SVR (so before gpf was fitted) and an 22MY P575.
I tried all 3 in dynamic mode.
The 18MY SVR was very loud (amusing but almost too much for me with constant popping and banging), then I tried the P575 and was surprised how quiet it was - pressing dynamic mode didn’t seem to change anything - so similar to your experience and a key reason why I didn’t buy the car I tried (the dealer said fitting a cross pipe would be an easy fix to get more noise but I wasn’t convinced).
My car is something in between - pulling fuse 15 didn’t seem to make much difference but others say it makes a big difference and of course the SVR exhaust is different from the R exhaust.
On my car pressing the exhaust button doesn’t change the exhaust tone at idle (whereas on my MY19 F-Pace SVR it does).
Overall the “active” part of my exhaust doesn’t seem to do much.
All very confusing!

P.S. you can check your active exhaust is working by looking up the end of your tail pipe - the valve should be open (as shown below) when car is off and closed very soon after you start the car.
 

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Thank you for all your information, I have not had chance to look up the rear end yet.
I can confirm that there is not any discerning difference in sound at tick over apart from start up.
Plus no change in sound at 50 mph using the switch.
But I did as Mickjaguar said and activated the switch whilst driving and dropped down a few gears and bought the revs up to 3500 which produced a loud bark and rapid acceleration, so thanks all sorted.
 
I was experimenting yesterday with the exhaust on my SVR and it really needs a good few revs and an aggressive driving style to wake it up - then you get a fair few pops and crackles.
Very hard to stay at legal speeds if you want a noisy exhaust on the later (with petrol particulate filter) models but I quite like the Jekyll and Hyde character🙂
Still enjoying getting to know my car - owned for a few months now but not done many miles yet
 
Apparently the Lambo Huracan V10 gets around the need for exhaust PPF’s by having combined direct and indirect injection.
If Jag did that it would sound like an expensive warranty claim 😂
 
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