[luca09]

In a german forum an owner said that his 2020 M5C is completely missing the crackles and backfire, propably due to EU Emission and Sound regulations.

Can anybody of the EU residents confirm that?

[Nikolov]

At least one other member (in the UK I think) reported the same.

[luca09]

That would be a great shame ...

Maybe the issue can be fixed with an after market exhaust, but I think that bmw simply decoded the crackles so that an after market exhaust won't bring them back..

[MSX]

Originally Posted by luca09

That would be a great shame ...

Maybe the issue can be fixed with an after market exhaust, but I think that bmw simply decoded the crackles so that an after market exhaust won't bring them back..

If this is the case can coder's not bring them back?

[luca09]

Originally Posted by MSX

If this is the case can coder's not bring them back?

Thats exactly the question to be answered...

[Nikolov]

Tuners can, not coders. You’re probably going to have your ECUs flashed to have the pops and bangs back. Might as well slap a pair of downpipes and a tune to go with that.

[limeypride]

Originally Posted by Nikolov

Tuners can, not coders. You’re probably going to have your ECUs flashed to have the pops and bangs back. Might as well slap a pair of downpipes and a tune to go with that.

Why do you say that? I don't know one way or the other so I'm curious how you do. Are you certain?

If they disable it similarly to any-dazzle lights then tweaking the VO + the necessary FDL coding seems like a plausible solution.

[Nikolov]

Because the burble/cracks/pops has to do with the ECU maps. These are not parameters you can change via coding (i.e. burbles = aktiv/nicht_aktiv).

I'm not 100% certain, but it's an educated guess.

[F90M5C]

i'm like Nikolov not 100% sure but i would guess it has to do with ECU tune.
like the F8X competition and non competition , people here do tune their cars to get it

[Simon H]

I thought all EU countries had the OPFs fitted, whereas in the USA they dont ?. If you have OPFs fitted, it is true that the exhaust bangs etc, are greatly reduced, but they are still there, albeit nowhere near as noticeable ?.

[RustySeatbelt]

That's correct. It's part of the tune and not coding. When I had my F80 tuned there is the option to change the burbles ( make them louder, longer, etc.). This is done in the ECU maps and isn't something you can change via coding.

[Nikolov]

Originally Posted by Simon H

I thought all EU countries had the OPFs fitted, whereas in the USA they dont ?. If you have OPFs fitted, it is true that the exhaust bangs etc, are greatly reduced, but they are still there, albeit nowhere near as noticeable ?.

The OPF fitted cars manufactured up until July or August 2019 have pops and bangs, the ones after that don't. US cars don't have an OPF (PPF), although for some reason realoem.com only supports cars up to 03/2019, so that may have changed.

[Simon H]

Originally Posted by Nikolov

The OPF fitted cars manufactured up until July or August 2019 have pops and bangs, the ones after that don't. US cars don't have an OPF (PPF), although for some reason realoem.com only supports cars up to 03/2019, so that may have changed.

Thats interesting, i wasnt aware that they had mapped out the bangs after July 2019.

[luca09]

Originally Posted by Simon H

Thats interesting, i wasnt aware that they had mapped out the bangs after July 2019.

Only EU Cars !!!

[F90M5C]

yea all model year 20 has no pops nor bangs , drove the X4M competition last month and noticed that.

[gpdriver17]

Same thing happened with the Mercedes C63 in the 2019 facelift. ECU tune will fix it. Personally I think the pops sound like s#it, especially if over done. It's as annoying if not more so than all the Civics that we're running around years ago when fast & the furious came out with fart cans on them.

[thermalc]

I agree losing the pops is no big deal, especially as someone that likes to drive mainly in sport, dealing with it on a daily basis gets annoying.

Making the exhaust as a whole quieter is the bigger problem.

[limeypride]

Originally Posted by thermalc

I agree losing the pops is no big deal, especially as someone that likes to drive mainly in sport, dealing with it on a daily basis gets annoying.

Making the exhaust as a whole quieter is the bigger problem.

The pops that sound like a gun going off are a 'meh' to me, too, but the thunder grumbles (as my kids call them) are not optional nor is the overall volume. Fortunately, I'm in the States and don't have to care yet about this but, regardless, this is the beginning of the end for ICEs and the dawn of the electric. Governments will steadily regulate-out all the fun until it no longer makes sense...

[luca09]

Originally Posted by limeypride

The pops that sound like a gun going off are a 'meh' to me, too, but the thunder grumbles (as my kids call them) are not optional nor is the overall volume. Fortunately, I'm in the States and don't have to care yet about this but, regardless, this is the beginning of the end for ICEs and the dawn of the electric. Governments will steadily regulate-out all the fun until it no longer makes sense...

@limeypride Can you describe in which situations the thunder grumbles appear in comparison to the crackles (gun shots)?

[JOHNBMWM5]

Originally Posted by luca09

In a german forum an owner said that his 2020 M5C is completely missing the crackles and backfire, propably due to EU Emission and Sound regulations.

Can anybody of the EU residents confirm that?

ALL new High performance cars will come with Particulate Filters in the exhaust systems this reduces sound, sorry ALL will be affected from Europe.

[powerenhancer]

Originally Posted by JOHNBMWM5

ALL new High performance cars will come with Particulate Filters in the exhaust systems this reduces sound, sorry ALL will be affected from Europe.

Yep, huge problem now for EU car enthusiasts. A chap looking to buy my 2018 RS3 said he had just handed back a new Golf R because of the noise difference between the pre-GPF model.

My local Audi dealer has had 2 customers hand back new 2019 RS3's for the same reason.

The issue is not just sound but lack of pops/bangs. Some lost sound can be corrected through less sound proofing in the centre and/or back box but the use of fuel to create backfires on overrun destroys GPF's so manufacturers are removing it from the maps. CAT's can cope within reason but not the GPF, which is closer to the manifold.

[limeypride]

Originally Posted by luca09

@limeypride Can you describe in which situations the thunder grumbles appear in comparison to the crackles (gun shots)?

The grumbles and pops both occur consistently in scenarios below I think ~3500 rpm and under 40 mph. Grumbles occur when you're barely on the gas and then let off. The pops occur when you're really on it and let off. 1st and 2nd gear will produce cracks at higher RPMs, too, that are loud enough to scare your passengers inside the car and send folks on the outside into a panic.