[mr_lab_rat]

Originally Posted by GoneIn4Secs

How is it that ferrari and other twin turbo setups like porches dont sound as bad then?

They are V or boxer cylinder configuration

[chris719]

Originally Posted by XutvJet

The S55 and S58 sound is the result of 3 cylinders funneling through a turbo and then merging into a single pipe. The sounds pulses are wonky thus the exhaust sound isn't pleasing. There's no way around it if you want the most efficient and powerful setup.

I am not sure about this. N54 doesn't sound great but it sounds closer to N55 than S55, and it is two turbos.

[Emme2]

S55 has OPFs so no point trying to equate it to N54?

[Rick4345]

I almost bought a 2019 M2C this week.

I'm glad I didn't. The S58 sounds like it will be a beast.

For now I'll be adding a few modifications to my 17 M2 and go from there.

[PilotxERAU]

Originally Posted by Rick4345

I almost bought a 2019 M2C this week.

I'm glad I didn't. The S58 sounds like it will be a beast.

For now I'll be adding a few modifications to my 17 M2 and go from there.

You and me both!

[XutvJet]

Originally Posted by GoneIn4Secs

How is it that ferrari and other twin turbo setups like porches dont sound as bad then?

All twin turbo Ferraris are V8s and are "hot Vs". They have four exhaust ports feeding a single turbo plus they have an entirely different firing order. V8s always sound cleaner too. Most turbo Porsches are V8s too. The 911 TT (H6 design) and some Porsche SUVs have twin turbo V6s, but most would say they don't sound that good. Still not as bad as the S55. Again, it comes back to firing order and the way the exhaust pulses are split.

The S55 and S58 are twin turbo inline 6s and use exhaust manifolds for three cylinders. The twin turbo N54 used a more restrictive and somewhat sound killing 3 cylinder manifold design vs the higher flowing, more tubular-like design of the S55/S58. The improved flow has a tendency to add some rasp because of improve velocity and the thinner wall tubing much like adding headers to naturally aspirated car. The E46 M3 and E9X naturally aspirated motors were pretty dang raspy too and much of that was because of their high flow tubular header designs. With the S55, those 3 cylinder exhaust manifolds teamed with the I6 firing order and the optimized the flow of the S55 exhaust system kills the exhaust note.

The N55 and B58, on the other hand, maintain that BMW inline 6 sound because they use a single turbo fed by all six cylinders. There's no splitting of the exhaust pulses like on the S55/58. All the turbo does on the N55 and B58 is muffle some sound so BMW simply had to design the muffler to be a little louder to let some of that BMW I6 sound through. Simple as that.

The 2JZ in the 93-98 Supra TT was a twin turbo I6 and sounds pretty dang good, BUT that's because it used a complex compound sequential design and didn't use a turbo fed by three cylinders to screw up the exhaust note. The Supra TT turbos were fed by a single exhaust manifold.

[ChrisK]

My next car will be a 911.

[Project_F87]

Originally Posted by Rick4345

I almost bought a 2019 M2C this week.

I'm glad I didn't. The S58 sounds like it will be a beast.

For now I'll be adding a few modifications to my 17 M2 and go from there.

Lol and why's that? The S55 tuned can easily make close to 550whp. You think an M2 needs more than that?

[GerardzM]

I'm just hoping for a dependable engine.

What's the last M engine that didn't have some sort of design flaw or critical failure?

[.2pdk]

Originally Posted by GerardzM

I'm just hoping for a dependable engine.

What's the last M engine that didn't have some sort of design flaw or critical failure?

I thought the S55 was relatively reliable no?

[hellrotm]

Originally Posted by .2pdk

I thought the S55 was relatively reliable no?

It relatively is. The crank hub issue is far smaller of an issue compared to S54, S65, S85 rod bearings. Same crank hub is used on the N55. N54 uses some of same parts. I know of few spun crank hubs on N54.

[dmboone25]

Originally Posted by ChrisK

My next car will be a 911.

I saw the new one at the auto show and it looks so good. The LED around the back looks fantastic in the flesh.

Definitely want one myself, but won’t be able to swing it just yet.

[chris719]

Originally Posted by Emme2

S55 has OPFs so no point trying to equate it to N54?

It doesn't in much of the world...

The post I responded to was attributing the sound of S55 and S58 to having dual 3-cylinder exhaust paths. Which N54 also has.

This has nothing to do with OPF, sorry.

[BAN_M2C]

Originally Posted by ChrisK

My next car will be a 911.

^^This...

While everyone keeps "holding back" for the next model I beat the shit out of my 2017 M2, put 16K miles on it in 18 months, tracked it, drifted it, road trips etc.. traded and walked with 6k in hand towards the M2 Competition and currently at 5K miles after European Delivery and 3 months with it here..

Enjoy what you have and stop holding up for the next best thing, there will always be something better..

After the Competition I see myself in a 911.. cant justify a more expensive M2 with or without and S58 nor an S55 version loaded with Carbon and a premium because of the limited number production..

[GerardzM]

Originally Posted by .2pdk

I thought the S55 was relatively reliable no?

It is, we don't see a massive amount of failures.

I'm just stating from the view point that if I purchase a vehicle with one(s55) I would feel almost obligated to purchase the following at a minimum:

-Oil Cooler Skidplate
-Upgraded Crankhub
-Upgraded A2W cooler

These parts alone, along with the crankhub install are costly.

Just doesn't seem right that this is the route we would have to take in order to guarantee those parts not randomly fail at a potentially inconvenient time.....even when fairly new!

I don't know, I could just be overly paranoid about it all haha

[SeanWRT]

N54 is a power monster at its time but a reliability nightmare.

N55 literally fixes all N54's flaws and is the next level smooth and efficient. Though the power is restricted by its turbo setup.

S55 is N55 based. It shares all N55's philosophies, with a sole focus on high performance, which requires a better turbo setup, a beefier engine block and a redesign of the entire cooling system. It's exactly the new cooling system that has its reliability problem, along with the crank hub weakness (for the power it makes) which is a carryover from N55.

S58 is seemingly more of an evolution than revolution, technology wise. It doesn't go mild hybrid (48V) that can carry these energy consuming accessories (pump, AC & etc), and doesn't have the electric blower that can help spool up so that bigger turbo be used for more efficient power. It also can't compare with V6 in hot V configuration that optimize the exhaust flow.

The highlight is the 3D print one piece cylinder head which enables:
1) Better coolant circulation
2) Better manifold thermal efficiency. This is significant. Especially with integrated turbofold. The tubular or casting design of turbofold is limited by traditional manufacture and cannot achieve the optimal geometry. Mind you turbo fold can dictate the low end spool up and top end free flow.
3) Weight reduction.

The rest of engine has some degree of redesign, but nothing new to worry about. BMW should be just fixing all S55 issues like they did with N55 from N54 and make them more efficient.

We didn't see very often BMW highlights its new engine like this time with S58. Personally I have high level confidence it's going to be absolutely powerful and very reliable. Given its bore/stoke and compression ratio configuration, it could have a lovely character too, finally.

Well, only the exhaust sound...

[as7920]

Originally Posted by BAN_M2C

^^This...

While everyone keeps "holding back" for the next model I beat the shit out of my 2017 M2, put 16K miles on it in 18 months, tracked it, drifted it, road trips etc.. traded and walked with 6k in hand towards the M2 Competition and currently at 5K miles after European Delivery and 3 months with it here.......

If only it required £6k over here. Looking at almost £12k minimum.

[.2pdk]

Originally Posted by GerardzM

It is, we don't see a massive amount of failures.

I'm just stating from the view point that if I purchase a vehicle with one(s55) I would feel almost obligated to purchase the following at a minimum:

-Oil Cooler Skidplate
-Upgraded Crankhub
-Upgraded A2W cooler

I don't know, I could just be overly paranoid about it all haha

Not sure about the other stuff but the oil cooler position is risky and after reviewing that skidplate it doesn't provide me with enough confidence.

[aWanderlustSeoul]

Originally Posted by akkando

I think it's going to be a while for self driving cars because there are so many edge cases with snow for traction and just seeing the road, construction, flooding, whatever. Even hills are a problem because the sensors can't see over the hill to see what's coming.

I do not believe the technology to make self-driving cars a real reality is too far in the distant future. I guess we will see.

Also weather could be a factor/variable in certain parts of the US or other countries but I don't see it being much of an issue for anyone living in moderate climates. Technology will eventually be so good that certain weather conditions (e.g. rain, snow) will be a minimal issue/risk.

[twintiga]

Originally Posted by BAN_M2C

^^This...

While everyone keeps "holding back" for the next model I beat the shit out of my 2017 M2, put 16K miles on it in 18 months, tracked it, drifted it, road trips etc.. traded and walked with 6k in hand towards the M2 Competition and currently at 5K miles after European Delivery and 3 months with it here..

Enjoy what you have and stop holding up for the next best thing, there will always be something better..

After the Competition I see myself in a 911.. cant justify a more expensive M2 with or without and S58 nor an S55 version loaded with Carbon and a premium because of the limited number production..

Agree!

Buy cars, enjoy them, upgrade them when a better one comes out. It’s just money!

The issue with the M2 is that it’s the entry level M car. When it starts getting into P-car territory regarding price...it’s time to move on. For $60k I’m a customer all day. The competition model M cars have been and will continue to be the sweet spot IMO.

[aerokubectl]

Originally Posted by Rick4345

I almost bought a 2019 M2C this week.

I'm glad I didn't. The S58 sounds like it will be a beast.

For now I'll be adding a few modifications to my 17 M2 and go from there.

Lawls keep waiting dawg. In 3 years you'll be just around the corner from the S68

[///M TOWN]

As soon as they're available to be had, I'll get excited.

Until then I'll drive the crap out of my current M2.