MFactory DCT SMFW (6 and 8 bolt)

doublespaces

Administrator
Oct 18, 2016
7,609
AZ
That is the best place, that is direct from the manufacturer. I got an early unit and need to install it but have had setbacks with my car for unrelated reasons. If you need a dct flywheel, buy it from there.
 

ilikebigboost

Lurker
Sep 7, 2018
13
That is the best place, that is direct from the manufacturer. I got an early unit and need to install it but have had setbacks with my car for unrelated reasons. If you need a dct flywheel, buy it from there.
I understand. I only want to get sure that is the right one because Iam from Germany and if something is not correct...
You can imagine thats a Problem... But nobody from M Factory is answering since weeks and I highly Need it...
 

Sbrach

Corporal
Oct 2, 2017
224
The misfires are false superknock causing injector deactivation. The DME is extremely sensitive to noise in the superknock window. Do you have a link to the post about it Houtan? I might be able to help.
 

houtan

Corporal
Nov 2, 2017
132
The misfires are false superknock causing injector deactivation. The DME is extremely sensitive to noise in the superknock window. Do you have a link to the post about it Houtan? I might be able to help.
Here you go Steve: https://www.n54tech.com/forums/showthread.php?t=54833

There are probably two guys in that thread that could use your help. The OP and the SMFW guy.

It could be something else, but the fourth post down, the person says they switched to the SMFW and misfires got worse. They also haven't contacted Mfactory yet, but that is the only post I have seen regarding the DCT SMFW.
 
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MFactory

Corporal
Premium Vendor
Oct 25, 2016
208
The ECU is set from factory to fall within a specific range of values for the cam and crank speeds (i.e how fast the cams and crank turns). Unfortunately, the faster everything rotates, the more likelihood of a speed difference between the cam and crank. When the values fall out of range, the ECU picks this up and self-adjusts (to protect your engine). This is what you will pick up as a "misfire" (and CEL), but isn't really a misfire per se.

The more you change the rotational mass (be it flywheel, pulleys etc), the more chance you will experience this; there are no exceptions. However, this can be reduced by:

1) Making sure the components are precisely balanced
2) Changing your ECU settings

The keyword here being "Reduced", not Eliminate. All of our flywheels are balanced to over 12,000rpm, and weigh 7.3kg (just over 16lbs. Similar to the oem M4 flywheel)
 

houtan

Corporal
Nov 2, 2017
132
Thanks for the info.

Does mfactory know what needs to be adjusted in the flash to account for the flywheel impacts?

I guess that would be a good thing to know for prospective buyers as these changes are not required for the factory m4 dual mass flywheel. At least not on a dct n55, from what I have seen.
 

MFactory

Corporal
Premium Vendor
Oct 25, 2016
208
Regarding the ecu flash, I will leave that to the experts to reply, as that is not my area of expertise unfortunately.

Our flywheel weighs nearly the same as the oem M4 flywheel, so if the false misfires happen with ours, it can happen with the M4 flywheel (and has. There are a few threads about this) as the false misfires are down to the rotational mass. The reason why there is a "range" of values is because there are a lot of variables that can cause a change in the crank/cam speed difference.
 

Sbrach

Corporal
Oct 2, 2017
224
I disagree that it is a related to crank/cam speeds. All the issues I have seen on the DCT cars is due to false superknock detection from 5400-5800 rpm. Superknock reaction is almost immediate injector deactivation.
 

MFactory

Corporal
Premium Vendor
Oct 25, 2016
208
From our experience with flywheels/flexplates and the false misfires "in general", it is almost always related to the reduced rotational mass. This is on any car, not just the BMW's.

However, if something else is also happening in particular with the DCT's, then we would also like to know.
 

Sbrach

Corporal
Oct 2, 2017
224
Yeah there are probably many factors at play. The DCT issue seems to be false superknock detection at a specific RPM range and over a certain load. I don’t think it is harmonic or it would always happen in that rev range. I haven’t had one apart but understand that the two masses are separated with springs and it is filled with oil/grease for damping. It seems when it gets hot and the fluid is thin high load is able to compress the springs to the point that something is hitting a stop and making noise. That’s my theory anyway. The S55 flywheel fixes it. I believe the cases where it doesn’t “fix the misfires” there is something else going on unrelated. There are many things that get grouped together as “misfires”. Tq interventions, cylinder deactivation, boost ceiling, etc.
 

4N Performance

Private
Free Vendor
Dec 11, 2017
47
I have had mine installed on my shop car for over a week now. It is the best $500 modification I have ever done. No misfires and I have been beating on it hard 19-20psi with stock turbos. The trans feels and shifts like an m4. My flywheel was completely toast all the fluid leaked out and it was only a matter of time until it would have failed catastrophically.

56652C65-D935-4B18-9527-2C97819B35D4.jpeg
F2D85FA4-B5DF-4E2C-AD00-C16334AE99BA.jpeg
 
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MFactory

Corporal
Premium Vendor
Oct 25, 2016
208
We have 4pcs of 8-bolts still left in stock. No more 6-bolts.

The new batch won't be ready till at least the end of the year. Due to the relatively "niche" market of the DCT worldwide (especially when compared to the MT), the new batch will be limited and sold on a first-come-first-served basis. We are already filling up a pre-order list for these, so if anyone is interested in pre-ordering one to ship from the new batch, please PM me asap as I cannot say for certain whether we will make more of these after the new batch is sold out.
 

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