Active exhaust at idle?

[maddog1982]

So quick question. Pressing the active exhaust button is it noticible at idle? I swear the S we sat in and started in the show room made the tone deeper but the last two I tried didn't seem to make much difference? Cars were outside and they were dynamics too.

All cars were 3.0 380hp

 

[Anonymous]

Presuming active exhaust was working (some get squeaky or stick) it depends on MY and whether they have had a software update.

 

[Tjp]

My active exhaust switch doesn’t seem to make any noticeable difference at idle… valves are free and don’t stick, but I can tell the difference on throttle. Possibly had the software upgrade before I purchased.

 

[maddog1982]

Hi All,

It's a very early dynamic on a 17 plate - All jag history so if there's any updates it would have had them. It just sounded loud when I hit the dynamic button very loud! When we press the race button on the golf r the tone goes deeper so was kinda expecting that. I guess I can get under it and see if they are opening and closing.

 

[cj10jeeper]

I have an early oem with active exhausts, so no later model suppression, software updates, applicable or applied.
When it starts up the exhaust is open and it revs up and holds that until a gear is engaged, pops and bangs and then drop to idle. All theatrical and noisy. From the point it returns to idle it's hard to tell the difference, perhaps a bit deeper, but touch the throttle, drive off etc. and very very different and distinctive.

Take a look ender or video it to check both valves are opening correctly, but I don't think anything is wrong,

 

[maddog1982]

I have an early oem with active exhausts, so no later model suppression, software updates, applicable or applied.
When it starts up the exhaust is open and it revs up and holds that until a gear is engaged, pops and bangs and then drop to idle. All theatrical and noisy. From the point it returns to idle it's hard to tell the difference, perhaps a bit deeper, but touch the throttle, drive off etc. and very very different and distinctive.

Take a look ender or video it to check both valves are opening correctly, but I don't think anything is wrong,

Cheers pal!!

 

[mickjaguar]

On early cars the valves were either open or closed, so the button or dynamic switch could be used to toggle the valves. i.e. if you wanted to be in dynamic and quiet, you could use the button to close them, or in normal mode use it to open.

Later cars fall into 2 categories, I think. At some point by 2018 the valves didn't start to open until 1500 revs (probably the software update mentioned which could be retrospective on earlier cars). Then around mid 2018 the PPFs were also added to the cats. It's all got too clever and complicated, so the switches don't seem to be logical any more.

Easy to prove if it's the nanny software operating, by pulling fuse 15 from the engine bay. With the fuse in place these cars don't fully open the baffles unless there's more than 3000rpm or heavy acceleration. With it removed the valves are wide open and you can hear immediately the rumble from tickover, it's very different. For the V8 anyway, V6 behaviour might be slightly different.

 

[Kdes]

Probably one of the most discussed and confusing items of f-type operation. Many have tried to write a definitive guide to when the exhaust opens/closes but as soon as they do someone contradicts it or says theirs is different.
This doc from Jaguar (around 2015 I think) explains the situation then.

https://www.jaguarforums.com/forum/attachments/f-type-x152-72/141208d1483853050-can-you-hear-exhaust-valves-open-f-type-active-exhaust.jpg

 

[Anonymous]

Just to add to the confusion, my MY20 P380 valves work at idle with a noticeable increase in noise and a deeper tone. Maybe they changed it back at the same time they fitted GPF’s?

 

[scm]

The active exhaust switch behaviour seems to vary from MY to MY. My MY18 has the 1500 rpm start for the active exhaust switch, while the valves open fully at tickover when I switch to dynamic mode. I think (but can't prove it!) that before the software update that cancels dynamic mode on every startup was applied, the valves opened at tickover with the active exhaust switch, not 1500 rpm. As they say - YMMV. :lol:

 

[maddog1982]

Thanks all! Seems its not overly clear and varies a lot!

 

[Ash1819]

Hi, new to the group , I have just purchased a 2019 March registration Svr, which is stunning and collecting in a week or so, I presume from the forum that the early 19 plates have the cat filter
allot of topics on this fuse 15 trick , can anyone confirm this before I try this as don’t want this to go into limp mode etc, if you have a 2019 Svr or r model

Fuse 15 gone and sport dynamic, manual shift I hear is the best you can get without mods, which I don’t want to do as will jeopardise my warranty .

Thanks

 

[mickjaguar]

Yes I have a September 2019 registered SVR and the removal of fuse 15 has not caused any issues in 6+ months of driving. Although someone who had a 2019 R said his went into limp mode when he tried.

It is slightly droney on the motorway, but just the right side of annoying. Other than that it' sounds just right inside the car (not much idea how loud it is outside) . Nice rumble at low revs.

Later cars don't pop and crackle like the earlier ones (not just the PPF cars). They seem to do it more when cold and are not so easy to provoke.

I get my hand up behind the bumper and exercise the exhaust valves periodically, in case they stick open. My fuse will go back in for the service and MOT in a couple of weeks.

 

[Ash1819]

Can you still feather the throttle on lift off to get a bit more or has the new software put a dampener on this aswell ?

Obviously I’m not expecting the 2014 pops and crackles you hear on YouTube , but just want the best I can get being stock Svr ! Sure the Svr exhaust would be better than standard r anyway.

Will defo try the fuse 15 once I have driven it for a day or two

Thanks

 

[mickjaguar]

Yes the throttle can be feathered a bit still, around 2500 revs is the spot usually. Mine seems to go berserk randomly, as it will ocassionally produce a massive bang or gunfire with hardly any effort, other times it just refuses to be provoked at all. Almost catlike!

This video has pre and post ppf F-types on it. The sound quality suffers from wind noise a bit. A 2017 SVR (orange) at 2:16 minutes , 2017 SVR (black) at 2:24 minutes, then a 2019 (blue) at 2:47 minutes and both again at 4:16 minutes , then 2017 (orange ) at 4:56 minutes again. Max speed on this would have been circa 40 mph, so part throttle at best.

https://www.youtube.com/watch?v=5kl10nQ1ZZ0

 

[Markusd]

As i described in my introduction, i am irritated of removing the fuse F15.
It is just more simpler to pull of the tube´s of the active exhaust valves. The ecu system doesn´t recognize it and you can add the deeper ton when driving.

What i recognized is that the deeper tone seems come from the subwoofer behind me. Just makes no difference when its on idle if i push the ative exhaust button, becaus valves are fully open.

Have it try if there is same as in my V6 Car from MY20. Driving at 2000 rpm and press active exhaust button, and hold your hand over the subwoofer. It seems it comes from there.

:lol: Syntetic exhaust.

I would like to have the old version (this sound was amazing), but with the LED Front and the bigger Touchscreen.

 

[jagseven]

Some good info in this thread - I’ve not yet pulled fuse 15 (I will do soon!) but I think I have the updated software on my MY19 SVR which means pressing the exhaust button does nothing on idle - valves remain firmly closed (I jumped out the car to look).
I don’t mind the quiet exhaust as much as I expected - certainly makes it easier to get on with neighbours etc - but I would definitely like the exhaust button to act like a switch so that pressing it opens valves 100% and leaves them open. I can see the valves are open by default - so when engine is off and car parked up the valves are clearly open.

The F-Pace SVR exhaust behaves in the opposite way to the F-Type - by default (when engine is off) the valves are closed. With that car you can turn ignition on with no foot on the brake pedal, press the exhaust button, then start the car for a loud start. Pressing the exhaust button also does change the sound on idle. The equivalent to removing fuse 15 is to unplug a connector in the boot AFTER you have opened the valve using the exhaust button - then the exhaust valve stays open all the time.

 

[munchie]

I pulled fuse 15 the other day on my 2021 p450 the other day it does make more noise lower in the rev range, not too intrusive but how a v8 should sound. IVe not Experienced any drone either.

 

[jagseven]

I have also now tried the car with fuse 15 pulled - wasn’t as loud as I expected. A very slight increase in “drone” when engine is under load but it’s a nice drone - not at all annoying. In fact most people probably wouldn’t even call it drone. If anything the car sounds more natural now. Best thing is this change is free, very quick and and easy to do and fully reversible.

 

[Tel]

Most newer cars removing Fuse 15 will do nothing.

Why? - Because later cars (circa Plate 2015 MY 2016) do not have the vacuum pump, plumbing and associated valves that earlier cars have. They rely on manifold vacuum only to achieve the same result.

On early cars though, it is definitely F15 that is the one to pull:



For the full picture of the exhaust setup, of which the final page is handy, see attached.


View attachment Active Exhaust System overview.pdf