N54 DCT w/M3 Conversion

[RSL]

To clarify further, what I've personally seen trying to get IKM0S on 335is with its original MSD81, IKM0S full writes successfully and shows "IKM0S" under HW, but the current ZB defaults to my factory 335is ZB with it. I've assumed that this is because 1M ZB is not in the 335 chassis/sw chain so it defaults to original ZB as a fail safe. Address blocks used don't match rom = fail.

1M ZB I've been testing with is 8619150 (N America 1M).

When there's a 135 ZB as original/DME is originally from a 135, it DOES recognize the 1M ZB correctly as current software after flashing and works. Pete's originally a 135 DME in a 335 after Euro IKM0S flash (8619148). 135 ZB original->IKM0S flashed->MHD stage 0 flashed:

 

[Keko]

P

lol ive lost track but heres couple of photos.. Built motor, SSP clutch with Billet basket, 135i brakes etc...View attachment 11506 View attachment 11504 View attachment 11505

power ?

 

[NoQuarter]

Relevant video explaining Park mode and low speed assist:

 

[NoQuarter]

I can't find the info on the re-pinning of the shifter. Help please?

 

[derekgates]

I can't find the info on the re-pinning of the shifter. Help please?

Pinout from @dyezak:

https://bmw.spoolstreet.com/threads/my-dct-conversion-to-m3-gws-flash.2929/post-33646


GWS pictures from @dyezak

My DCT conversion to M3 GWS/FLASH

So I'm getting ready to start my conversion this morning. I'm going to be following the steps below: 1. Pull a full ZB readout from INPA (for roll back purposes) 2. Flash the M3 ZB to my TCU 3. Check the vehicle operation and report back 4. Change my GWS to the M3 version A. 335is GWS...

bmw.spoolstreet.com

 

[NoQuarter]

How small a of a tire diameter would get the ratio where it needs to be?

 

[aus335iguy]

2.56:1 vs 3.15:1
around 80% of the standard diameter .... or have I got that the wring way round ?
Somewhere in the issues thread @dyezak made the initial discovery and did all the mathematical calculations that proved his final drive theory.

 

[NoQuarter]

I think it would be the other way around. At 3.15, the TCU would expect to see a wheel speed slower than if running a 2.56 so the tire would need to be larger ??

Quite a bit larger I think. Even if tried to hit 2.91 it would need a 28.4" tire (assuming original tire is 25")

2.91/2.56 * 25" = 28.4"

Anyone got 21" wheels for my Z?

 

[scrllock]

There's been discussion on the m3 boards of swapping to a shorter ratio diff, could be useful. Seems someone out there has figured out what's needed in the dkg to do this:

BMW M3 Forum (E90 E92) - View Single Post - Running a 3.62 diff with a DCT

Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums

www.m3post.com

 

[NoQuarter]

There's been discussion on the m3 boards of swapping to a shorter ratio diff, could be useful. Seems someone out there has figured out what's needed in the dkg to do this:

BMW M3 Forum (E90 E92) - View Single Post - Running a 3.62 diff with a DCT

Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums

www.m3post.com

Hmm. This is the real deal? Cautiously optimistic....

 

[aus335iguy]

Sounds like he’s recommending different tyre sizes to accomodate the change in ratio. Not sure where but this I feel was discussed before and it was stock software. Hope I’m wrong

 

[scrllock]

No, pretty sure he's offering a modified dkg flash. He's just saying that slightly different tire sizes won't ruin the 3.65 ratio tuning.

 

[aus335iguy]

It’d be awesome if I’m wrong.

 

[doublespaces]

I've had multiple email discussions with Oliver.

He claims to have access to the necessary keys to sign the software so it can be flashed normally. But he never responded to any queries about pricing after I asked him about the t what was possible. See this from over a year ago:

Public Post Development

Hey @doublespaces can we add @dzid_ to our dev thread ? He already has access

bmw.spoolstreet.com

 

[Tzaks]

There's so much useful information in this thread. Super grateful!
Let me share some more info for the other Z4 owners, found this guy on instagram, volikalex. He has a Z4 with the M3 DCT conversion so I asked him how did he do it.
He said he only needed the gear selector and the M3 GTS flash. He had someone re-program his Sport/comfort buttons to "clutch" -not sure what he's on about here, DSC perhaps- and that he didn't need to swap the diff ratio.

 

[NoQuarter]

There's so much useful information in this thread. Super grateful!
Let me share some more info for the other Z4 owners, found this guy on instagram, volikalex. He has a Z4 with the M3 DCT conversion so I asked him how did he do it.
He said he only needed the gear selector and the M3 GTS flash. He had someone re-program his Sport/comfort buttons to "clutch" -not sure what he's on about here, DSC perhaps- and that he didn't need to swap the diff ratio.

This would be interesting to try and understand more. Things get tricky if there are language barriers but you can't also discount that he might not have the ability/experience to tell the difference if the ratio behavior was bad or good.

 

[houtan]

There's so much useful information in this thread. Super grateful!
Let me share some more info for the other Z4 owners, found this guy on instagram, volikalex. He has a Z4 with the M3 DCT conversion so I asked him how did he do it.
He said he only needed the gear selector and the M3 GTS flash. He had someone re-program his Sport/comfort buttons to "clutch" -not sure what he's on about here, DSC perhaps- and that he didn't need to swap the diff ratio.

Thanks for the info. Are you going to reach back out to him to get additional clarification?

 

[Tzaks]

I doubt that he'll tell me more. He didn't even answered until I started guilt tripping him )
Maybe you guys contact him as well and ask him too?

 

[Tzaks]

This would be interesting to try and understand more. Things get tricky if there are language barriers but you can't also discount that he might not have the ability/experience to tell the difference if the ratio behavior was bad or good.

I think he'd probably know. His other car is a subaru doing 8.4 1/4 mile.

Hopefully soon I'll get a GWS module and a drivelogic button so I can have a go at this too.

@NoQuarter , what progress have you made on your Z with the GTS flash if you don't mind me asking?

 

[aus335iguy]

If he’s a quarter mile kinda guy the car would behave really well, slamming into gear on upshift. The issue is lazy shifts up high in terms of speed and rev matching on downshifts.