No more Crackle and pops after update.

No more Crackle and pops after update.

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Discussion

Mikebentley

6,037 posts

139 months

Saturday 28th November 2020
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I have no problem with the Jaguars “pops and bangs” and enjoyed my drive in several with this quality.....however who would make their car 130db to the extent they need to wear cheap ear plugs when driving it? Surely it was just about willy waving and shouty look at me behaviour. A well tuned TVR on fairly mundane exhausts sounds fantastic.

My neighbour used to have a tuned WRX and would warm it up before leaving home and let it idle when he returned before switching it off. It used to resonate through my whole house and was frankly ridiculous. I wasn’t sad when he moved. I do feel though the OP is entitled to enjoy his purchase as it was sold to him.

GroupieB

2 posts

42 months

Tuesday 30th March 2021
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Hmm. I just took the wife's SVR in for routine service to be told they'd be doing a s/ware update. I asked what for and the answer was some F-Types were exceeding EU noise levels.

I pointed out that we are not in the EU and that we're quite happy with the sound: it's a key characteristic of the car. I've forbidden them to make the modification.

bunchofkeys

1,046 posts

67 months

Tuesday 30th March 2021
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Chainsaw Rebuild said:
FezSpider said:
am sure some one must give a toss mate rolleyes. I dont wink
One of my favourite saying of 2020 courtesy of Maverick (topgun 2)
" Its inevitable that your kind is heading for extinction" , in which he replies "maybe so sir, but not today".......not today biggrin

So now I will leave you with two sound bites of my unnecessary loud and obnoxious machines biggrin
https://youtu.be/PBmc_wjlw58
https://youtu.be/EUVYZDSwX34

Edited by FezSpider on Thursday 19th November 15:04
That Ferrari sounds amazing!
Filmed in the same location, shot with a potato, but that F50!
https://www.youtube.com/watch?v=5sXCiBtFcu8

roadsmash

2,622 posts

69 months

Tuesday 30th March 2021
quotequote all
GroupieB said:
Hmm. I just took the wife's SVR in for routine service to be told they'd be doing a s/ware update. I asked what for and the answer was some F-Types were exceeding EU noise levels.

I pointed out that we are not in the EU and that we're quite happy with the sound: it's a key characteristic of the car. I've forbidden them to make the modification.
That is madness. Can’t believe they are proactively doing it.

angusfaldo

2,790 posts

273 months

Tuesday 30th March 2021
quotequote all
GroupieB said:
Hmm. I just took the wife's SVR in for routine service to be told they'd be doing a s/ware update. I asked what for and the answer was some F-Types were exceeding EU noise levels.

I pointed out that we are not in the EU and that we're quite happy with the sound: it's a key characteristic of the car. I've forbidden them to make the modification.
My V8 R had its service this week, including software upgrades. This at a main dealer. It has had zero impact on the hooligan soundtrack - it's just as stupid now as it was before.

Pursyluv

1,927 posts

173 months

Tuesday 30th March 2021
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Mikebentley said:
.....however who would make their car 130db to the extent they need to wear cheap ear plugs when driving it? Surely it was just about willy waving and shouty look at me behaviour.
Showed my wife this post and she completely agrees with you hehe

ExecutiveAction

337 posts

36 months

Saturday 17th April 2021
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Pursyluv said:
Monkeylegend said:
I guess that confirms it then smile

Sorry, I said shout I GUESS THAT CONFIRMS IT THEN.

I can't believe I ever doubted you but those ear plugs mean business, perfect for 130 db's.
Thank you, I thought that photo would settle it
Wait a minute....I get tuning your exhaust for noise. But why do that AND THEN use ear defenders?

ExecutiveAction

337 posts

36 months

Saturday 17th April 2021
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a8hex said:
Hugo Stiglitz said:
Phil Dicky said:
Does that apply too all V8 sports cars and V10s and V12s too. They all chavmobile barried cars.
Does every v8/10/12 car come with snap, crackle and pop?
Jaguar V12s should generally purrrrrrrrrr
Except down at Winspeed last year they had an V12 E Type with the most glorious spine tingling howl I've ever heard from a car. It wasn't mega loud, just sounded fabulous. Obviously no artificial programmed in pops.
Interesting, I’ve never heard a V12E making a really impressive sound, more a turbine roar. All sorts of cars make all sorts of sounds. I just don’t l8ke the idea of neutering them. I drove some early F Types and they popped and banged on the overrun. It was good fun and I don’t recall anyone frowning at me.

ExecutiveAction

337 posts

36 months

Saturday 17th April 2021
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GroupieB said:
Hmm. I just took the wife's SVR in for routine service to be told they'd be doing a s/ware update. I asked what for and the answer was some F-Types were exceeding EU noise levels....
Your wife’s got an SVR? I’m impressed.

ExecutiveAction

337 posts

36 months

Saturday 17th April 2021
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Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?

LunarOne

5,095 posts

136 months

Saturday 17th April 2021
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ExecutiveAction said:
Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?
If it's detonating fuel in the exhaust cycle, then surely that's downstream of the exhaust valves and into the cat, so how would it affect the injectors? Or are you saying the injectors inject extra fuel and that clogs them up? Still sounds like nonsense to me. So I'd say the answer is no. It's possible but very highly unlikely.

ettore

4,119 posts

251 months

Saturday 17th April 2021
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Does anyone actually know the truth behind this? - or is it PH supposition?

beemarman

Original Poster:

179 posts

228 months

Saturday 17th April 2021
quotequote all
ExecutiveAction said:
Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?
This is true. In fact, in the US Jaguar is offering an extended warranty on the Co2 Sensor if you agree to apply the software that reduces the pops.

Pursyluv

1,927 posts

173 months

Saturday 17th April 2021
quotequote all
ExecutiveAction said:
Pursyluv said:
Monkeylegend said:
I guess that confirms it then smile

Sorry, I said shout I GUESS THAT CONFIRMS IT THEN.

I can't believe I ever doubted you but those ear plugs mean business, perfect for 130 db's.
Thank you, I thought that photo would settle it
Wait a minute....I get tuning your exhaust for noise. But why do that AND THEN use ear defenders?
I’ll answer because I’m bored, because the reverb from the central reserve walls got a bit much, and until you’ve done the mod, you really don’t know how it will sound

LunarOne

5,095 posts

136 months

Saturday 17th April 2021
quotequote all
beemarman said:
ExecutiveAction said:
Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?
This is true. In fact, in the US Jaguar is offering an extended warranty on the Co2 Sensor if you agree to apply the software that reduces the pops.
You've just proven that it's not true. CO2 sensor will be in the exhaust where the excess fuel is being burnt, while the injectors will be in the cylinders. A clogged injector is not the same thing as a damaged CO2 sensor!

ExecutiveAction

337 posts

36 months

Monday 19th April 2021
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LunarOne said:
beemarman said:
ExecutiveAction said:
Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?
This is true. In fact, in the US Jaguar is offering an extended warranty on the Co2 Sensor if you agree to apply the software that reduces the pops.
You've just proven that it's not true. CO2 sensor will be in the exhaust where the excess fuel is being burnt, while the injectors will be in the cylinders. A clogged injector is not the same thing as a damaged CO2 sensor!
I'm not a motor engineer, but I don't think they are talking about injecting fuel into the exhaust, but into the cylinders on the exhaust cycle.

ExecutiveAction

337 posts

36 months

Monday 19th April 2021
quotequote all
ettore said:
Does anyone actually know the truth behind this? - or is it PH supposition?
Tell you where I got it from - this YouTube video, and the accompanying Part 2.

https://www.youtube.com/watch?v=Jryg6jyeSCs&t=...


LanceRS

2,171 posts

136 months

Monday 19th April 2021
quotequote all
Back in the good old days, cars popped and cracked on the overrun because carburettors and basic mechanical fuel injection was not precise enough to provide the full amount off fuel under load throughout the rev range and then stop when you took your foot off the throttle. The more heavily tuned for power (therefore the need for lots of fuel) the more pronounced. This only presented itself when accelerating the suddenly releasing the pedal, if you gently lifted off, no extra noises.
The result was over fuelling and the extra fuel igniting without the throttle. This is why it generally only happened on engines tuned for performance.
Similar things do still happen, McLarens on the upshift without lifting etc.
Modern electronics, injection systems can be mapped so accurately that this no longer needs to happen but some obviously misses it and has mapped it in, the trend has caught on and now the more sporty the car is supposed to be, the more artificial noises it has (Audi S3 etc).
In any event, if you have bought a car because of certain characteristics, the dealer should not be removing them. Imagine taking it in for a Service only for it to return with some sort of eco tyres rather than your Pilot Sport 4s!


LunarOne

5,095 posts

136 months

Monday 19th April 2021
quotequote all
ExecutiveAction said:
LunarOne said:
beemarman said:
ExecutiveAction said:
Can I add a small comment. I understand that the pops and bangs are created by injecting extra fuel to detonate in the exhaust cycle. Apparently this can cause the injectors to clog up, requiring attention or use of additives. Is it possible that they are changing the software to prevent this problem arising?
This is true. In fact, in the US Jaguar is offering an extended warranty on the Co2 Sensor if you agree to apply the software that reduces the pops.
You've just proven that it's not true. CO2 sensor will be in the exhaust where the excess fuel is being burnt, while the injectors will be in the cylinders. A clogged injector is not the same thing as a damaged CO2 sensor!
I'm not a motor engineer, but I don't think they are talking about injecting fuel into the exhaust, but into the cylinders on the exhaust cycle.
I get that, but if the injectors can cope with burning the fuel and air mix in a closed cylinder (with both valves closed) under pressures of 1000psi+, (https://www.performancetrends.com/Definitions/Cylinder-Pressure.htm) then I'm sure it can cope with much lower pressures generated when the exhaust valves are open.

a8hex

5,829 posts

222 months

Monday 19th April 2021
quotequote all
LunarOne said:
I get that, but if the injectors can cope with burning the fuel and air mix in a closed cylinder (with both valves closed) under pressures of 1000psi+, (https://www.performancetrends.com/Definitions/Cylinder-Pressure.htm) then I'm sure it can cope with much lower pressures generated when the exhaust valves are open.
On the other hand the conditions of injecting with the exhaust valve open will be completely different to injecting with both valves closed so if the injection system is designed for one scenario it might not like another quite so much. From a simple view point it sounds like it should be much easier to cope with the port open case, but other factors might come into play that I at least don't know about. I guess the temperature drops quite quickly once the cylinder pressure falls so combustion processes might not be so complete and you'd want the stoichiometric ratio to pretty bang on while the main propulsion injection occurs so there is unlikely to be much free oxygen to burning the extra fuel supplied just for effect.