Opinions / Advice on 2017 E550 m278 engine noise
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Member
Joined: Jan 2006
Posts: 243
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From: Cookeville TN
2017 E550 Coupe
Opinions / Advice on 2017 E550 m278 engine noise
2017 E550 m278, engine seems excessively noisy
I bought the car earlier this year with 90k miles. I do not hear the noise in the cabin and it is barely noticeable with the hood shut. I have removed my mufflers and resonators, but doubt that caused an issue. I am not sure if this is just the way the engine sounds due to the direct inject, turbos or general design or if I am in need of some repair work. Any feedback would be greatly appreciated.
Video
https://photos.app.*******/PhbzrySSKDGQiDEX8
I bought the car earlier this year with 90k miles. I do not hear the noise in the cabin and it is barely noticeable with the hood shut. I have removed my mufflers and resonators, but doubt that caused an issue. I am not sure if this is just the way the engine sounds due to the direct inject, turbos or general design or if I am in need of some repair work. Any feedback would be greatly appreciated.
Video
https://photos.app.*******/PhbzrySSKDGQiDEX8
Thread Starter
Member
Joined: Jan 2006
Posts: 243
Likes: 2
From: Cookeville TN
2017 E550 Coupe
Last edited by jac1502; Oct 17, 2024 at 09:47 AM. Reason: link not working
Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
I have a 2014 E550 m278…which afaik is the last year MB put m278 in an E-class. I’m not saying you don’t have one, but it would be the first one I’ve heard of…they still made S550’s until 2017 with m278, I believe.
Are you in the US?
Are you in the US?
Thread Starter
Member
Joined: Jan 2006
Posts: 243
Likes: 2
From: Cookeville TN
2017 E550 Coupe
US car 2017 Mercedes E550 coupe with a biturbo 4.6L (edit 4.6L) V8. Am I incorrect about that being a m278 engine?
Manufacture date 10/2016.
Last edited by jac1502; Oct 21, 2024 at 10:13 PM.
Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
Nope, I’m wrong and that’s a beautiful car!! Of course I’m a little biased, as it looks like a fresher clone of my black coupe! Nice wheels too (jealous!). Ok now I’ll try to listen for the sound issue
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Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
That does sound rather familiar, and I’ve been told that’s mostly the DI engine. However, some within this forum would recommend a slightly thicker oil viscosity and/or more frequent oil changes, since our hot turbo engines cause the oil to shear faster, lowering viscosity and resulting in a noisier engine.
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
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Thread Starter
Member
Joined: Jan 2006
Posts: 243
Likes: 2
From: Cookeville TN
2017 E550 Coupe
That does sound rather familiar, and I’ve been told that’s mostly the DI engine. However, some within this forum would recommend a slightly thicker oil viscosity and/or more frequent oil changes, since our hot turbo engines cause the oil to shear faster, lowering viscosity and resulting in a noisier engine.
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
Senior Member
Joined: Mar 2022
Posts: 267
Likes: 61
From: Chicago
Bi-Turbo E550 Coupe (W207)
Senior Member
Joined: Mar 2022
Posts: 267
Likes: 61
From: Chicago
Bi-Turbo E550 Coupe (W207)
That does sound rather familiar, and I’ve been told that’s mostly the DI engine. However, some within this forum would recommend a slightly thicker oil viscosity and/or more frequent oil changes, since our hot turbo engines cause the oil to shear faster, lowering viscosity and resulting in a noisier engine.
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
I’m no expert by any measure, though I’ve replaced VVT gear, water pump and turbo coolant lines on that engine…so I’m earning my keep at least. Lol
Hopefully others chime in soon! Good luck
Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
@Jaybird123 I see you have both an E63 Sedan and E550 Coupe. Is there noticable performance difference in terms of speed? I am sure the E63 Sedan handles better as it has a better suspension setup, but wanted to get a sense if there is a big difference in acceleration and speed given that the coupe is much lighter than the sedan.
So, the m278 is pretty quick due to the OETuner Stage 1 map. It’s also fun as it’s RWD and I’m very used to those (past BMWs and MBs). However, the E63S stock is significantly faster than the tuned m278. Almost shockingly so…when you punch the m157 at 30mph it’s what I call ‘video game fast’ up to 90mph without hesitation.
I’m still debating if or how much tuning I will do with the m157, both on account of stock performance being so great and fear of longevity concerns. There would be little to gain on street driving, as it takes full concentration as is…it’s that quick. Does that make sense? The AWD plus LSD also plays a significant part in delivering that higher performance I think…I do enjoy the coupe still…but it’s just not as exhilarating
Senior Member
Joined: Mar 2022
Posts: 267
Likes: 61
From: Chicago
Bi-Turbo E550 Coupe (W207)
Great question! I do love both of these cars, though I’m a bit sad that the turbos are a weak link and such an $$ pain to replace (as my m278 needs done now).
So, the m278 is pretty quick due to the OETuner Stage 1 map. It’s also fun as it’s RWD and I’m very used to those (past BMWs and MBs). However, the E63S stock is significantly faster than the tuned m278. Almost shockingly so…when you punch the m157 at 30mph it’s what I call ‘video game fast’ up to 90mph without hesitation.
I’m still debating if or how much tuning I will do with the m157, both on account of stock performance being so great and fear of longevity concerns. There would be little to gain on street driving, as it takes full concentration as is…it’s that quick. Does that make sense? The AWD plus LSD also plays a significant part in delivering that higher performance I think…I do enjoy the coupe still…but it’s just not as exhilarating
So, the m278 is pretty quick due to the OETuner Stage 1 map. It’s also fun as it’s RWD and I’m very used to those (past BMWs and MBs). However, the E63S stock is significantly faster than the tuned m278. Almost shockingly so…when you punch the m157 at 30mph it’s what I call ‘video game fast’ up to 90mph without hesitation.
I’m still debating if or how much tuning I will do with the m157, both on account of stock performance being so great and fear of longevity concerns. There would be little to gain on street driving, as it takes full concentration as is…it’s that quick. Does that make sense? The AWD plus LSD also plays a significant part in delivering that higher performance I think…I do enjoy the coupe still…but it’s just not as exhilarating
Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
I definitely experience better mpg in the m278, which aligns with documentation from MB. I have not calculated exactly in the m157 yet, but I was getting 26+mpg in the m278 with 135k mi. I would guess low 20mpg’s max in the m157, also must factor in frequent WOT runs since it’s still so new to me and so fun haha.
I replaced SO many critical parts on my m278, I simply have to do the turbos and extend its life. My only longevity concern after that will be the tranny. I’ve heard a faint whine occasionally upon acceleration. :/
I replaced SO many critical parts on my m278, I simply have to do the turbos and extend its life. My only longevity concern after that will be the tranny. I’ve heard a faint whine occasionally upon acceleration. :/
Senior Member
Joined: Mar 2022
Posts: 267
Likes: 61
From: Chicago
Bi-Turbo E550 Coupe (W207)
I definitely experience better mpg in the m278, which aligns with documentation from MB. I have not calculated exactly in the m157 yet, but I was getting 26+mpg in the m278 with 135k mi. I would guess low 20mpg’s max in the m157, also must factor in frequent WOT runs since it’s still so new to me and so fun haha.
I replaced SO many critical parts on my m278, I simply have to do the turbos and extend its life. My only longevity concern after that will be the tranny. I’ve heard a faint whine occasionally upon acceleration. :/
I replaced SO many critical parts on my m278, I simply have to do the turbos and extend its life. My only longevity concern after that will be the tranny. I’ve heard a faint whine occasionally upon acceleration. :/
Thread Starter
Member
Joined: Jan 2006
Posts: 243
Likes: 2
From: Cookeville TN
2017 E550 Coupe
Great question! I do love both of these cars, though I’m a bit sad that the turbos are a weak link and such an $$ pain to replace (as my m278 needs done now).
So, the m278 is pretty quick due to the OETuner Stage 1 map. It’s also fun as it’s RWD and I’m very used to those (past BMWs and MBs). However, the E63S stock is significantly faster than the tuned m278. Almost shockingly so…when you punch the m157 at 30mph it’s what I call ‘video game fast’ up to 90mph without hesitation.
I’m still debating if or how much tuning I will do with the m157, both on account of stock performance being so great and fear of longevity concerns. There would be little to gain on street driving, as it takes full concentration as is…it’s that quick. Does that make sense? The AWD plus LSD also plays a significant part in delivering that higher performance I think…I do enjoy the coupe still…but it’s just not as exhilarating
So, the m278 is pretty quick due to the OETuner Stage 1 map. It’s also fun as it’s RWD and I’m very used to those (past BMWs and MBs). However, the E63S stock is significantly faster than the tuned m278. Almost shockingly so…when you punch the m157 at 30mph it’s what I call ‘video game fast’ up to 90mph without hesitation.
I’m still debating if or how much tuning I will do with the m157, both on account of stock performance being so great and fear of longevity concerns. There would be little to gain on street driving, as it takes full concentration as is…it’s that quick. Does that make sense? The AWD plus LSD also plays a significant part in delivering that higher performance I think…I do enjoy the coupe still…but it’s just not as exhilarating
.
Senior Member
Joined: Mar 2018
Posts: 485
Likes: 153
From: KY
2015 E63S Sedan, 2014 E550 coupe
In short, I think the tune was likely a part of their demise…however, I should’ve installed decatted downpipes to alleviate some back pressure. Also, I went cheaper on tuning as I didn’t know as much about various methods to increase power back then. Finally, from what I’ve seen and learned from Tasos videos…those turbos are junk. They all fail due to wastegate issues, housing cracks, etc etc.
I will buy aftermarket improved turbos to replace them…but I don’t have a lift in my garage to facilitate the engine out repair.
I will buy aftermarket improved turbos to replace them…but I don’t have a lift in my garage to facilitate the engine out repair.
