Public Post Development

Stokes

Corporal
Jan 26, 2018
125
Houston, TX
I should be getting my car back from the shop either tomorrow or Tuesday with the full drivetrain swap and a 2.81 gear. I'm already running the stock M3 tire size (275/35-19). I've reset nothing at this point but will once I have the car back. I guess I'll find out if this is outside the "comfort" zone or not for the M3 software.
So far 3.08 seems to be working. It was soft and started firming up (adapting?) as I drove. I forgot how one wheel peel sounds as I'm running with the all season highway tires right now.

It chirps into 4th and I find that I want to hold longer before shifting now. Maybe I'm going back to E36 muscle memory with the lower gearing.

Going to get some logs soon.

Oh and tire size won't matter. I had in my mind speed equivalent not shaft rotation and it was explained and pointed out earlier to me in this thread.
 

Stokes

Corporal
Jan 26, 2018
125
Houston, TX
I just chatted with Turner and they say the 2.81 is safe for factory DCT programming. I was asking for how they were able to recode the transmission for the new final drive. They said it works within factory parameters. So, is the 2.81 close enough to work with M3 programming parameters?

@LMB335is let us know what you experience. It would be awesome if the 2.81 would work with either programming. More flexible.
 
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aus335iguy

Lieutenant
Nov 18, 2017
913
I think a Can shield placed on the DCT wiring only, intercepting and changing the road speed indications from the DSC will do the trick
 

MilkBags

New Member
Feb 28, 2018
9
Montreal, Canada
Is this ready to be published? I've been keeping up for the past months and want to attempt this on my N55 135i DCT since everything worked for @dyezak.

I wanna do the M3 GTS DCT conversion and M3 LSD swap first. I have most of the parts (M3 KOMBI, diff, driveshaft, axle shafts, GWS) sourced, just need to pull the trigger. Might do adjustable launch control later and correct me if I'm wrong, but I doubt flashing a 1M DME would work on a N55 so I wouldn't do MDM.

I was planning on making my own thread with my progress, but I will probably have questions. Where would be the best place/thread to ask them?

My buddy who runs a local BMW Indy shop will help me and will do most of the mechanical work some I'm not worried about any of that, but the coding part is a bit scary as we don't have experience with NCSExpert, just Autologic.
 

dyezak

Major
May 4, 2017
1,768
Plano TX
Is this ready to be published? I've been keeping up for the past months and want to attempt this on my N55 135i DCT since everything worked for @dyezak.

I wanna do the M3 GTS DCT conversion and M3 LSD swap first. I have most of the parts (M3 KOMBI, diff, driveshaft, axle shafts, GWS) sourced, just need to pull the trigger. Might do adjustable launch control later and correct me if I'm wrong, but I doubt flashing a 1M DME would work on a N55 so I wouldn't do MDM.

I was planning on making my own thread with my progress, but I will probably have questions. Where would be the best place/thread to ask them?

My buddy who runs a local BMW Indy shop will help me and will do most of the mechanical work some I'm not worried about any of that, but the coding part is a bit scary as we don't have experience with NCSExpert, just Autologic.
It is published in the N54 section already.
 

dyezak

Major
May 4, 2017
1,768
Plano TX
I think a Can shield placed on the DCT wiring only, intercepting and changing the road speed indications from the DSC will do the trick
Although this absolutely will work, the development of such a box would probably be just short of the amount of effort required to crack the DCT TCU...and that opens a whole new world of options.

We need to collectively push in a singular direction to get either option moving under its own power.

I think @MOTIV Motorsport has a great reputation of those type of boxes (boost box, flex fuel) and if you got buy in from them on creating a PnP CAN Shield in-line going to the DCT that might be the way to go. POC can be done with arduino, but you want a more solid solution for the masses...and given the standardization of the CAN messages along with the sheer number of DCT cars across the BMW range of performance offerings...there is a market there for this type of a device.

I just want the full TCU access like the 6HP guys have.
 
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