Official - USA BMW M3 / M4 M Competition Package Guide PDF

[FC4]

Originally Posted by CanAutM3

What makes you think that ?

Further, I just don't see how a modified bedplate would give the engine more power. I could understand that a modified bedplate could be needed to deal with more power, but it would not make more power by itself. Further, with the quantity of cars out there making big power on the base bedplate withou issues, I wonder if this was really warranted. No mention of this bedplate modification on the GTS either...

Certainly not impossible, but it's unlikely for a software change to only provide gains for a <2000 RPM window. It would mean timing or peak boost pressure is left unchanged but target boost is marginally increased after 5500 RPM. Sure it's possible, but it's not logical. This is assuming BMW's graph in the PDF above is accurate.

And, no, a modified bedplate will not have an effect on power.

[CanAutM3]

Originally Posted by FC4

Certainly not impossible, but it's unlikely for a software change to only provide gains for a <2000 RPM window. It would mean timing or peak boost pressure is left unchanged but target boost is marginally increased after 5500 RPM. Sure it's possible, but it's not logical. This is assuming BMW's graph in the PDF above is accurate.

Why?

Boost on the S55 is controlled through the wastegates and those are electronically controlled. So it is quite easy to increase boost over a given RPM window through a software change. We are no talking of a piggyback here. BMW have full access to their own DME and can program whatever they want.

The power increases on the S63Tu of 560hp->575hp->600hp were all done through software only and those increases are only on the top portion of the RPM band, just as with the S55.

Fundamentally, BMW did exactly what is needed to improve the performance of the S55. Maximum acceleration is achieved by keeping the RPM above 5500RPM anyhow, so to increase ultimate acceleration, power needs to increased in that range (5500-7300RPM). Increasing power below 5500rpm is not needed and would just exacerbate traction issues by increasing peak torque.

[FC4]

Touche. http://f10.m5post.com/forums/showthr...ht=competition

It just makes more sense to increase boost slightly across the board as opposed to pulling less boost approaching redline. But hey, I have no qualms with addressing top-end performance. That's where the focus should be and that's where it has the greatest effect on acceleration.

[z335is]

Am I the only current 2016 owner that is a little pissed about this? I mean regardless of how you slice it, we are halfway through the 2nd model year and there are already MAJOR changes to the car and I'm not talking only the ZCP but possibly to the base as well.

Is it partially my fault for not waiting a few more months? Sure. But again, who thought such major changes would be coming down the pipeline so soon?

[Guleb]

@bedplate; looks like there was actually a change because oil pan code is new (older doesn't fit to LCI). So if there was a difference, it was for all LCI including CP. There is no CP specific code in ETK.

BTW S55B30A engine ETK number is also new from1/1/2016 and is not exchangeable retrospectively and is the same for all post 1/1/2016 models including CP. Again no specific CP code for engine like it was for CP suspension.

[blinkme323]

Originally Posted by Guleb

@bedplate; looks like there was actually a change because oil pan code is new (older doesn't fit to LCI). So if there was a difference, it was for all LCI including CP. There is no CP specific code in ETK.

BTW S55B30A engine ETK number is also new from1/1/2016 and is not exchangeable retrospectively and is the same for all post 1/1/2016 models including CP. Again no specific CP code for engine like it was for CP suspension.

Interesting...but the LCI was technically all 2016 M3s, not just 1/1/16 onward. Or are those part numbers different across the 2016 MY gamut?

[CanAutM3]

Originally Posted by Guleb

@bedplate; looks like there was actually a change because oil pan code is new (older doesn't fit to LCI). So if there was a difference, it was for all LCI including CP. There is no CP specific code in ETK.

BTW S55B30A engine ETK number is also new from1/1/2016 and is not exchangeable retrospectively and is the same for all post 1/1/2016 models including CP. Again no specific CP code for engine like it was for CP suspension.

This change is not related to LCI. It is simply a product evolution effective starting Dec-2015 production. The M4 also gets the revisions and has not yet gotten LCI. There is no specific engine block part number for the CP (the bedplate is an integral part of the engine block).

[blinkme323]

Originally Posted by CanAutM3

This change is not related to LCI. It is simply a product evolution effective starting MY2016. The M4 also gets the revisions and has not yet gotten LCI.

Ok, I was just curious since my 2016 was delivered in Sep. Good to know that this encompasses all of them.

[shivaswrath]

Great info for thousands of us exploring options...

[z335is]

Originally Posted by CanAutM3

This change is not related to LCI. It is simply a product evolution effective starting MY2016. The M4 also gets the revisions and has not yet gotten LCI.

Wait so are those changes effective for ALL 2016 Ms or just ones produced after 1/1/16? If the latter, then that is ridiculous.

[dmk08]

Originally Posted by z335is

Wait so are those changes effective for ALL 2016 Ms or just ones produced after 1/1/16? If the latter, then that is ridiculous.

Standard practice for BMW to change little things through the run.

[solstice]

Originally Posted by dmk08

Standard practice for BMW to change little things through the run.

It is, few things are perfect from the first MY and we who buy them know this. If something is really bad we get recalls, if not we're fine, at least until warranty runs out...

However this could possibly spell trouble for 2015 owners eyeing a potential retrofit of the ZCP power package depending on the margins to the "issue" that triggered the bedplate change and how cautious BMW want to be.

[M4TW]

Originally Posted by mkoesel

Nonsense, I've already upgraded my bedplate to an aftermarket CFRP piece with OLED accents. It voided my warranty, but I know it is worth it every time I climb underneath the car, remove the underbody shielding, and can almost see it. I can also feel the slightly lighter front end every time I take a corner at 160mph.

Is the bedplate mod a difficult DIY? Do you have pics? I feel emboldened to attempt a more challenging DIY mod based on my success in installing my rear license plate.

Ever since I read about this I am certain my butt dyno can feel my bedplate weighing my engine down and threatening to fail, spilling all the internal parts of my engine on the road.

It goes without saying that I will not be attempting any 160 mph corners until there is a warranty campaign to replace this part.

[z335is]

Originally Posted by dmk08

Standard practice for BMW to change little things through the run.

Oh I understand that, but to make such a slew of changes midway through the second model year? I don't know...

I may be mistaken though and no one has really answered my question - are the aforementioned changes just for 2016s manufactured after 1/1/16 or all 2016 models?

[devilbones]

Originally Posted by M4TW

Is the bedplate mod a difficult DIY? Do you have pics? I feel emboldened to attempt a more challenging DIY mod based on my success in installing my rear license plate.

Ever since I read about this I am certain my butt dyno can feel my bedplate weighing my engine down and threatening to fail, spilling all the internal parts of my engine on the road.

It goes without saying that I will not be attempting any 160 mph corners until there is a warranty campaign to replace this part.

I think that he was just kidding about this.

[Bluex]

Originally Posted by devilbones

I think that he was just kidding about this.

And I'm pretty sure his response to that was also very tongue in cheek.....

The challenging DIY of installing his rear plate clued me in.....

[///M-Furby]

Originally Posted by z335is

Am I the only current 2016 owner that is a little pissed about this? I mean regardless of how you slice it, we are halfway through the 2nd model year and there are already MAJOR changes to the car and I'm not talking only the ZCP but possibly to the base as well.

Is it partially my fault for not waiting a few more months? Sure. But again, who thought such major changes would be coming down the pipeline so soon?

The only car companies that don't update their cars are those that are no longer in business.

[devilbones]

Originally Posted by Bluex

And I'm pretty sure his response to that was also very tongue in cheek.....

The challenging DIY of installing his rear plate clued me in.....

[blinkme323]

Originally Posted by z335is

Oh I understand that, but to make such a slew of changes midway through the second model year? I don't know...

I may be mistaken though and no one has really answered my question - are the aforementioned changes just for 2016s manufactured after 1/1/16 or all 2016 models?

Reading through the above it seems that all 2016s got the new bedplate, which I would be happy about (why I'm not sure).

[specracer]

I assume not, but does the comp package offer any rev match management, and the ability to turn it off (or on in all modes as some would like)?

Dare to dream...

[CanAutM3]

Originally Posted by z335is

Wait so are those changes effective for ALL 2016 Ms or just ones produced after 1/1/16? If the latter, then that is ridiculous.

I edited my OP to bring more precision. According to ETK, a new block PN was introduced starting with December 2015 production. There is no CP specific block PN specified for the CP, so it is safe to assume all cars built Dec-2015 onward are getting the upgrade.

Not sure why you are saying this is "ridiculous". Cars, as any other product, are continuously getting upgrades/revisions during their lifecycle. Most of them we are not aware of.

[dmk08]

Originally Posted by CanAutM3

I edited my OP to bring more precision. According to ETK, a new block PN was introduced starting with December 2015 production. There is no CP specific block PN specified for the CP, so it is safe to assume all cars built Dec-2015 onward are getting the upgrade.

Not sure why you are saying this is "ridiculous". Cars gets upgrades/revisions all the time.

If thats the case why would they put it in the ZCP publication? Not saying its not the case just wondering what you think there.