Z4 35is M3 DCT Conversion

NoQuarter

Captain
Nov 24, 2017
1,056
Indiana
Getting started on the DCT conversion to M3 DCT

First thing is to make the shifter look like it belongs.

The Z4 shifter on the left. M3 on the right sitting on top of the trim.

The M3 shifter leather looks large enough to change its shape from the "triangle" to the "square".

Unless anyone has a better idea, My plan is to use a heat gun to remove the blue plastic frame/leather you can see on the Z4 shifter (and also on the M3 shifter)

then fit the M3 leather over the Z4 frame.

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aus335iguy

Lieutenant
Nov 18, 2017
932
Looks like it’ll work I’m going to use an m5 knob and surround which has less leather. I was going to buy an eBay leather boot and adapt it. Like you I’d have to heat gun the leather off the knob.
 

doublespaces

Administrator
Oct 18, 2016
7,329
AZ
Looks like it’ll work I’m going to use an m5 knob and surround which has less leather. I was going to buy an eBay leather boot and adapt it. Like you I’d have to heat gun the leather off the knob.
What is the difference? I did a search and didn't find anything. Speaking of boots, it would be pretty sweet to get rid of the leather entirely:
JXMaUH4.png
 

NoQuarter

Captain
Nov 24, 2017
1,056
Indiana
Right... I was thinking the same thing on that style with no leather. I was looking at the M4 shifter because of that but the box required 2 PTcan connections instead of a LINbus.
 
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NoQuarter

Captain
Nov 24, 2017
1,056
Indiana
I just got an opening at my body shop I have been waiting for. I will take the Z4 in tomorrow so I won't be working on the DCT coding until after.
 

NoQuarter

Captain
Nov 24, 2017
1,056
Indiana
Nothing too exciting. I been waiting a month to get in and finally got an opening.

My Z had been wrecked prior to me getting it and the headlights, hood, front bumper has an alignment issue that makes me a little disappointed every time i see it :frowning:
 
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NoQuarter

Captain
Nov 24, 2017
1,056
Indiana
Been waiting to see how the final drive ratio issue got sorted out.

It looks like now I can do a wavetrac or mfactory as those ratio's seem to be close enough according to results posted in the other thread.

Wasn't anticipating doing a diff swap. Being a Z4 I am not keen on having it down too much over such a short driving season so this will be a winter project I think unless I can figure out where to get this done "quickly".
 

Blue335is

Specialist
Dec 12, 2016
58
Could you swap the lsd diff, as in the the actual differential, I to the case of the Z4 diff? I realize the casing is drastically different from something like a 335is but I've never understood if the internals could be swapped. If you could with a custom drive shaft it seems you would fix one of the weakest points of the e89.
 

Blue335is

Specialist
Dec 12, 2016
58
Yeah you can get LSDs from different companies but it wont strengthen the weakest point of the e89 drivetrain which is the pinion coming out of the diff that the driveshaft slides on to.
 

Blue335is

Specialist
Dec 12, 2016
58
Didn't know that was a problem. Just reading about broken axles but not the pinion from the diff.
Yeah we talked about it at length in my dct Facebook group. A friend of mine broke his twice. First time we went to a Mfactory LSD. After the second time we rebuilt it with the upgraded ring and pinion from mfactory as well as replacing all the diff and subframe bushings with stiffer units.
 
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