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Pops and crackles

 
Old 07-08-2019, 12:44 AM
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In the name of science I've been experimenting with my car the last couple of nights to really try and dial into some info that may be helpful. For reference, I have as 2018 C63 S sedan. Of course I get a loud bark on upshifts at almost any RPM. What I've come to realize is the nuance of downshifts. I'm speaking primarily of gears 1-3 because I did this in town and I was in Sport + and Race. I can't get a gunfire sound on downshift over 3k rpm. All I hear is noise. Meaning, if I downshift at 4-5k all I get is engine noise. If I downshift at 5k then immediately peg it and let off the throttle. I will get a small gunshot type sound. Where I really here it is at 2500-3k rpm. For example If I'm at 5k in 3rd and back off the throttle and when it hits 3k and I downshift. I get a nice report of a gunfire shot sound. I duplicated this over and over again. I'd like someone to try this on their 2019 and report (no pun intended) back with results. Fwiw my Huracan does the same thing as well. Above 3k I get noise. At 3k or less it's crazy. My theory is at the higher rpm the engineers don't want to drop the fuel to make the back fire as it may cause some sort of issue or they have their reasons why.
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Old 07-08-2019, 03:08 AM
  #252  
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Originally Posted by benzbell View Post
In the name of science I've been experimenting with my car the last couple of nights to really try and dial into some info that may be helpful. For reference, I have as 2018 C63 S sedan. Of course I get a loud bark on upshifts at almost any RPM. What I've come to realize is the nuance of downshifts. I'm speaking primarily of gears 1-3 because I did this in town and I was in Sport + and Race. I can't get a gunfire sound on downshift over 3k rpm. All I hear is noise. Meaning, if I downshift at 4-5k all I get is engine noise. If I downshift at 5k then immediately peg it and let off the throttle. I will get a small gunshot type sound. Where I really here it is at 2500-3k rpm. For example If I'm at 5k in 3rd and back off the throttle and when it hits 3k and I downshift. I get a nice report of a gunfire shot sound. I duplicated this over and over again. I'd like someone to try this on their 2019 and report (no pun intended) back with results. Fwiw my Huracan does the same thing as well. Above 3k I get noise. At 3k or less it's crazy. My theory is at the higher rpm the engineers don't want to drop the fuel to make the back fire as it may cause some sort of issue or they have their reasons why.
A lot of the desired sounds ie pops and bangs come from abrupt lift of throttle at 2-5k rpm gear 2-4 imo. This is what is mainly missing in the ‘19s. I personally don’t care about stationary revving as it is irrelevant to me.
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Old 07-08-2019, 08:42 AM
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Originally Posted by benzbell View Post
In the name of science I've been experimenting with my car the last couple of nights to really try and dial into some info that may be helpful. For reference, I have as 2018 C63 S sedan. Of course I get a loud bark on upshifts at almost any RPM. What I've come to realize is the nuance of downshifts. I'm speaking primarily of gears 1-3 because I did this in town and I was in Sport + and Race. I can't get a gunfire sound on downshift over 3k rpm. All I hear is noise. Meaning, if I downshift at 4-5k all I get is engine noise. If I downshift at 5k then immediately peg it and let off the throttle. I will get a small gunshot type sound. Where I really here it is at 2500-3k rpm. For example If I'm at 5k in 3rd and back off the throttle and when it hits 3k and I downshift. I get a nice report of a gunfire shot sound. I duplicated this over and over again. I'd like someone to try this on their 2019 and report (no pun intended) back with results. Fwiw my Huracan does the same thing as well. Above 3k I get noise. At 3k or less it's crazy. My theory is at the higher rpm the engineers don't want to drop the fuel to make the back fire as it may cause some sort of issue or they have their reasons why.
In my 2019 I get the shotgun sound when I let off the throttle at or above 5k rpm in gear..thatís when it is the loudest.. I get a little rumble and crackle when I let off around 4K. No where near as loud as when I let off at 5k in gear though.. at 3k or less itís non existent.
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Old 07-08-2019, 09:50 AM
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Same thing to report as purplewidow, my 2019 makes all the theatrics from abrupt throttle liftoff at 5K plus. It will pop and crackle over and over again at 5K. When driven very hard for an extended period in S+, the car will pop and crackle even more often at lower revs (maybe around 4K). This is usually when engine and transmission temps are higher than normal (190/220).

Main takeaway is the 2019 only makes the fun sounds when driven hard whereas the 2017 made them as long as you were in S+/Race. And the 2019 will not pop ever when downshifting.

Will try Benzbellís suggestion later today

Last edited by Xec; 07-08-2019 at 09:52 AM.
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Old 07-08-2019, 10:35 AM
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Originally Posted by Xec View Post
Same thing to report as purplewidow, my 2019 makes all the theatrics from abrupt throttle liftoff at 5K plus. It will pop and crackle over and over again at 5K. When driven very hard for an extended period in S+, the car will pop and crackle even more often at lower revs (maybe around 4K). This is usually when engine and transmission temps are higher than normal (190/220).

Main takeaway is the 2019 only makes the fun sounds when driven hard whereas the 2017 made them as long as you were in S+/Race. And the 2019 will not pop ever when downshifting.

Will try Benzbellís suggestion later today
if you blip the throttle a bit when downshifting will it?
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Old 07-08-2019, 11:26 AM
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Originally Posted by alexasa View Post
if you blip the throttle a bit when downshifting will it?
The car rev-matches going down the box already so blipping won't likely have the desired effect.

I picked up my 2019 C63S coupe today in the UK. It's still being run in but for the purposes of 'science' I put it in race and blipped while stationary, obviously keeping the revs below 4k. I did get pops and crackles on the first time but none subsequently. Basically, repeating what others have found so far.
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Old 07-08-2019, 12:14 PM
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Originally Posted by CitznFish View Post
He also skips leg day. Look at those toothpicks
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Old 07-08-2019, 02:00 PM
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Anyone tried secondary cat delete on the facelift C63s? It is way too quite.. not just the crackles, but the overall exhaust sound. EU regulations..
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Old 07-08-2019, 03:33 PM
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Originally Posted by benzbell View Post
In the name of science I've been experimenting with my car the last couple of nights to really try and dial into some info that may be helpful. For reference, I have as 2018 C63 S sedan. Of course I get a loud bark on upshifts at almost any RPM. What I've come to realize is the nuance of downshifts. I'm speaking primarily of gears 1-3 because I did this in town and I was in Sport + and Race. I can't get a gunfire sound on downshift over 3k rpm. All I hear is noise. Meaning, if I downshift at 4-5k all I get is engine noise. If I downshift at 5k then immediately peg it and let off the throttle. I will get a small gunshot type sound. Where I really here it is at 2500-3k rpm. For example If I'm at 5k in 3rd and back off the throttle and when it hits 3k and I downshift. I get a nice report of a gunfire shot sound. I duplicated this over and over again. I'd like someone to try this on their 2019 and report (no pun intended) back with results. Fwiw my Huracan does the same thing as well. Above 3k I get noise. At 3k or less it's crazy. My theory is at the higher rpm the engineers don't want to drop the fuel to make the back fire as it may cause some sort of issue or they have their reasons why.
Its interesting how these cars do not have a consistent behaviour. I have a 2017 and sometimes i end up double shifting down (car shifts down a gear before i realize and then i manually shift another) but when that does happen my exhaust gives off very loud pops because the rpm is so high so much so that one time the guy behind me braked lol
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Old 07-08-2019, 03:41 PM
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Originally Posted by playalistic View Post
The car rev-matches going down the box already so blipping won't likely have the desired effect.

I picked up my 2019 C63S coupe today in the UK. It's still being run in but for the purposes of 'science' I put it in race and blipped while stationary, obviously keeping the revs below 4k. I did get pops and crackles on the first time but none subsequently. Basically, repeating what others have found so far.
you must not get it. anyways - in other cars you could do this to intiate cracks and pops
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Old 07-08-2019, 03:55 PM
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Which cat has the particulate filter, or do they both?
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Old 07-09-2019, 06:12 AM
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Originally Posted by alexasa View Post
you must not get it. anyways - in other cars you could do this to intiate cracks and pops
Ah, I see now. Yeah - with my 2017 you could just give it a bit of gas in the lower gears, abruptly lift-off the throttle and as long as you were in sport+/race you'd get a few pops/bangs.
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Old 07-12-2019, 08:58 AM
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This was an official fix back in 2016/2017 to give back the pops and bangs. I had it done on my 2016 C63s and noticed a huge difference and if you read the previous thread I was very skeptical about it to begin.

Can / Does anyone smarter than I know if this can be applied to the newer models or GLC63s to get the same pops and bangs?

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Old 07-16-2019, 09:43 PM
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Copy paste of what I posted on Private Lounge.

I had a response from Gavin from Mercedes-Benz Australia Technical division today. I originally raised the case some weeks ago and he had been waiting for a response from Germany.

He advised me that he reached out to his counterparts in Germany, and provided a response along these lines,

- The backfires/pops were eased off to protect the OPF and prolong its lifespan. Basically they put it down to the new euro emissions, even though to my knowledge the Australian delivered cars do not come with the OPF fitted. It doesn't sound like they will be releasing a patch to rectify owners complaints at this stage.

I do know that the GT63 has the backfires and pops that the C63 seems to be missing, and that is fitted with OPF too. So not sure what the go is there. But as it stands it seems like we won't be getting any progress. For me, whilst this is disappointing it isn't the end of the world - as the car is a great allround package (this would just be the cherry on top) so I will be happy to live with it for now.

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Old 07-16-2019, 09:51 PM
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Originally Posted by Jeff087 View Post
Copy paste of what I posted on Private Lounge.

I had a response from Gavin from Mercedes-Benz Australia Technical division today. I originally raised the case some weeks ago and he had been waiting for a response from Germany.

He advised me that he reached out to his counterparts in Germany, and provided a response along these lines,

- The backfires/pops were eased off to protect the OPF and prolong its lifespan. Basically they put it down to the new euro emissions, even though to my knowledge the Australian delivered cars do not come with the OPF fitted. It doesn't sound like they will be releasing a patch to rectify owners complaints at this stage.

I do know that the GT63 has the backfires and pops that the C63 seems to be missing, and that is fitted with OPF too. So not sure what the go is there. But as it stands it seems like we won't be getting any progress. For me, whilst this is disappointing it isn't the end of the world - as the car is a great allround package (this would just be the cherry on top) so I will be happy to live with it for now.
Secondary cat delete. Easy solution
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Old 07-16-2019, 09:56 PM
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Originally Posted by untamedd View Post
Secondary cat delete. Easy solution
Does a secondary cat delete cause a CEL and require a tune to pass emissions?
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Old 07-16-2019, 10:04 PM
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Originally Posted by wazuh View Post
Does a secondary cat delete cause a CEL and require a tune to pass emissions?
Nope. That is only if you have the primaries taken out. No CEL and no tune needed with a secondary cat delete.

It will definitely make it more mean.

Short clip of my exhaust with sec cat delete. No brainer mod

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Old 07-16-2019, 10:12 PM
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Originally Posted by untamedd View Post
Nope. That is only if you have the primaries taken out. No CEL and no tune needed with a secondary cat delete.

It will definitely make it more mean.

Short clip of my exhaust with sec cat delete. No brainer mod

https://vimeo.com/333590418
That sounds awesome, you have any other (outside rolling) clips?
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Old 07-16-2019, 11:01 PM
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Originally Posted by wazuh View Post
That sounds awesome, you have any other (outside rolling) clips?
that's the pre-fl c63 btw
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Old 07-16-2019, 11:04 PM
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Originally Posted by Profomo View Post
that's the pre-fl c63 btw
Yeap noticed that, any volunteers to be the guinea pig and first face lift owner to try it? : )
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Old 07-17-2019, 02:47 PM
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Whilst Iím not worried about the pops, I would like to know why they marketed the car via the press launch with lots of pops and crackles then production cars were retuned.

On on another note, my car is beginning to pop and blip the throttle on downshifts.

I am beginning to think that the car has been programmed to release its full potential gradually as per the running in procedure. Is this possible?
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Old 07-17-2019, 03:18 PM
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Originally Posted by wazuh View Post
Yeap noticed that, any volunteers to be the guinea pig and first face lift owner to try it? : )
I'm looking for local shops here that can carry this out once I'm fully run-in. Plan to get it done immediately after so will report back

Originally Posted by Uga Uga View Post
Whilst Iím not worried about the pops, I would like to know why they marketed the car via the press launch with lots of pops and crackles then production cars were retuned.

On on another note, my car is beginning to pop and blip the throttle on downshifts.

I am beginning to think that the car has been programmed to release its full potential gradually as per the running in procedure. Is this possible?
You may expect the car to loosen up a little in that respect but reports from folks with relatively big miles (3k+) are saying there is little discernible difference, though my gut feeling is the change in sound over time is a difficult one to perceive objectively...
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Old 07-19-2019, 12:23 PM
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Originally Posted by playalistic View Post
I'm looking for local shops here that can carry this out once I'm fully run-in. Plan to get it done immediately after so will report back
Cool, thanks. I'm thinking to do the secondary cat delete as well, if you get it done please post vids For the pre-facelift owners who removed the secondary cats, is there alot of drone?
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