M3-M4 Article from Engine Technology International, January 2014

[Paul-Bracq-BMW]

Enjoy the read!!

[nonagon]

Good stuff! It seems like the new engine will be lag-free and they concentrated on cooling. All good news.

There was some weird info about the engine in 1M coupe, (which is an M tuned N54), saying it shared the S55 designation. Is that accurate? Might be but it sounds wrong to me.

[gee-m-w]

So the engine weighs 452 pounds and is 22 pounds lighter than the V8. Interesting facts.

[RMB]

Awesome read. Thanks for posting.

[gblansten]

Great post. This engine is really looking like it might be tremendously fun.

[CanAutM3]

Thanks for sharing

I am curious to what "impulse charging" refers to to. I have seen it quoted more than once, but have not figured out what it implies from a technical perspective.

I am still eager to find out what is the trick technology (if any) ///M has used to reduce lag.

[solstice]

I wish they would have asked if this technology means that the S55 is significantly more responsive than the S63TU which isn't bad but not nearly good enough for the more track oriented M3 IMO. No to say that the M3 is a track car but it's usually more track friendly than the M5.

[Paul-Bracq-BMW]

Originally Posted by CanAutM3

Thanks for sharing

I am curious to what "impulse charging" refers to to. I have seen it quoted more than once, but have not figured out what it implies from a technical perspective.

I am still eager to find out what is the trick technology (if any) ///M has used to reduce lag.

From what I understand, it's a system that keeps the turbocharger spinning at a certain set high speed under low load so when power is fed, the turbo lag is minimised...

[JTO24]

Good read.. Even tho power will fall off before hand, I like that it'll rev up to 7800 rpm still.

[mkoesel]

"80mm bore and 89.6mm stroke"

That's doesn't even add up to 3L. I wonder if we'll ever know the real bore dimensions?

Nice read though - thanks for posting. However, after reading it thoroughly, wow, there are a number of glaring errors like "...even though it shares the same S55 designation as the 1M Coupe's..."

[JoeFromPA]

7800 rpms is a wonderful redline/fuel cutoff; I believe that's about what the reprogrammed s54 hit after the initial 8000rpm redline kerfuffle.

What really stuck out to me is that the s55 has 70% more torque at 2000 rpms and 40% more torque at 7500 rpms than the s65. That is:

1. A boatload more torque in daily driving. Combined with a lighter weight this thing should SCOOT at 2000rpms when you wood it.

2. Indicates a really nice kick in the pants when shifting up to the next gear, if you are getting that much additional torque between 5000-6000 rpms compared to where the s65 would be.

As many others have said, it's all about area under the curve. And what I'm reading is that there is ALOT more power throughout + several hundred pounds less to power around.

Really good stuff all around.

[Keto]

I'm excited about the low-end oomph.

[CanAutM3]

Originally Posted by Paul-Bracq-BMW

From what I understand, it's a system that keeps the turbocharger spinning at a certain set high speed under low load so when power is fed, the turbo lag is minimised...

Obviously...

The question is how this is achieved ?

[aus]

Shouldn't a 3L I6 weight more than just 20 kg less than a 4L V8???

Looks like most people here are ok with the lack of linear power delivery up top.

.

[solstice]

Originally Posted by aus

Shouldn't a 3L I6 weight more than just 20 kg less than a 4L V8???

Looks like most people here are ok with the lack of linear power delivery up top.

.

Remove all turbo junk and bore the thick block and you will have a much lighter NA 3l I6. FI comes with extra weight.

[bimmerjph]

Originally Posted by aus

Shouldn't a 3L I6 weight more than just 20 kg less than a 4L V8???

Not with the turbos and intercoolers it won't.

[Chill72]

Besides the actual quotes from Siegl and Biermann this article is worthless. They show figures that are not confirmed and nothing that we haven't heard before. However, it was still a good read since it;s about the new beast.

[Boss330]

Originally Posted by mkoesel

"80mm bore and 89.6mm stroke"

That's doesn't even add up to 3L. I wonder if we'll ever know the real bore dimensions?

Nice read though - thanks for posting. However, after reading it thoroughly, wow, there are a number of glaring errors like "...even though it shares the same S55 designation as the 1M Coupe's..."

Not to mention that in the "Fact box" it says Bore: 80mm, Stroke 84,6mm...

[BMW M3 CRT]

Originally Posted by gee-m-w

So the engine weighs 452 pounds and is 22 pounds lighter than the V8. Interesting facts.

Really interesting fact ... seem like the inside source from the german m-forum was right as he tells me, that the new S55 (205kg!) would be a little bit heavier than the ongoing S65 (202kg!).

Seem logical ... if you compare the engine netto weights, an 3.0ltr.I6 is probably lighter than an 4.0ltr.V8, but in gross weight an BiTurbo with racetrack proof cooling need many heavy cooling parts ánd its never less an great weight saving effort to make him in nearly the same weight class als an proven lightweight V8.

Greetings BMW M3 CRT

[jsublime]

Originally Posted by Boss330

Not to mention that in the "Fact box" it says Bore: 80mm, Stroke 84,6mm...

Whether it's 84 or 89, both of these statements contradict earlier info about the engine being oversquare.

[Gearhead999s]

Originally Posted by CanAutM3

Obviously...

The question is how this is achieved ?

I read somewhere that they are keeping the throttles open under deceleration to reduce pumping losses to help keep the turbos spooled up but only when its in the sport or sport plus drive modes.I cannot remember where I read this though

[Kuwen]

I thought it has been previously stated the turbos were Mitsubishi?