N54 DCT w/M3 Conversion

derekgates

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:laugh: Well... it was a bit of a shock to see xHP come out and have 95% of the outcomes I was hoping for... holy hell it was worth the pain.

I can imagine that BMW did this same setup with the 335is and couldn't let it go to market because it destroys the M3. hahaha

Oh that's horrible. You should just have that car crushed NOW and start all over again :tearsofjoy: :grin:

Filippo

Oh you have me wanting to do that with the incredible Z4 work you have been working on... and @NoQuarter ... and @Lurcher ... I have strongly considered starting from a different chassis a few times! :)



[EDIT] Oh... I am contacting RB about some Game Finishers. Oil pan, valve cover (w/ head plugging), cooling system change over... oh yes.
 
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derekgates

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Minor update... I kept getting weird grinding noises with slow speed turns and have been worried that the diff is dead... Turns out this has been a problem since the E46 diffs (due to clutch packs and fluid type). I checked fluid in diff and it came rushing out of fill hole so I didn't replace with the friction modifier bottles I have in garage. Maybe it *doesn't* have that in the diff already?

BMW had TSB when E90/E92 M3 came out which includes fluid change and tight circle driving/600 mi to get rid of that grinding/clunking noise...

https://www.m3post.com/forums/showthread.php?t=722833 (has TSB)

Otherwise car seems great. Has usual N54 issues (leaks, noises, clunks) and needs new turbos. Might make a thread for the car but I've done a lot since 2014... haha

Now to decide between:

- RB Game Finishers (~$3450)

or

- RB Two Pluses ~($2150). 🤔
 
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aus335iguy

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@derekgates the coding guide was rough and ready when it was first released. Any suggestions for improvement would be appreciated. I have the word version somewhere need to make sure it’s ready for others who have inbound parts ;)
 
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derekgates

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@derekgates the coding guide was rough and ready when it was first released. Any suggestions for improvement would be appreciated. I have the word version somewhere need to make sure it’s ready for others who have inbound parts ;)

Yeah it was quite a while ago!

The main things I ran into was not having a quick guide for NCS Expert (F1 F3, E89, blah blah blah) which meant I had to watch YouTube of @LMB335is and slowed me down.. then the VO module 'defaulting' wasn't listed which would be great to have as well (turn off FSW/MAN processing when 'SG_CODERIN' each module). My car needed multiple modules 'defaulted', which might impact others.

I think other additions to the guide is 'what to expect' for various levels of hardware. Not sure we ever sorted that out? I haven't tested LC but I can get the 6 bars of "M"...

[EDIT]: Totally forgot about the -2TC tripping me up; the '-' need to be '$' ... Remove $2TC instead of Remove -2TC

https://www.evernote.com/l/ABPZYCf939RBL7IRyJTsExp-V5TGQdUfTl0/ Here are my collected notes that got me through the work... it's all from here and @LMB335is
 
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derekgates

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Have groaning noises with the diff. Changed fluid to ensure it was FM type and to ensure intervals are being adhered to...

IMG_2168.JPEG
IMG_2171.JPEG
IMG_2173.JPEG


FM Booster BMW fluid, magnetic drain plug and new fill plug.



IMG_2174.JPEG


Yeah, that was nasty fluid. Wow.
 

derekgates

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@derekgates How much did you have to shorten the m3 driveshaft to weld the dct flange on?


> I included the 'transmission side' of the 335i shaft for the flange (left the back-half to reduce weight). 62cm from trans flange to center bearing is what I measured on my car, it is written on the M3 shaft in white marker. The 335i center bearing is in there as well as the bearing that goes into the flange itself.


So, 62mm to the center bearing from trans flange. It was the same as @LMB335is
 

martymil

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People think that m3 diff fluid is lifetime and just because they don't drive hard it doesn't need changing,I change mine very 15000 km.

It's not really that expensive, i spend more on engine oil every 5k.

Consider your self lucky I've seen oil that came out like tar and had to flush it with mineral engine oil.

Its surprising the lack of maintenance on most m3's especially by BMW.
 

derekgates

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People think that m3 diff fluid is lifetime and just because they don't drive hard it doesn't need changing,I change mine very 15000 km.

It's not really that expensive, i spend more on engine oil every 5k.

Consider your self lucky I've seen oil that came out like tar and had to flush it with mineral engine oil.

Its surprising the lack of maintenance on most m3's especially by BMW.

Yeaaap I am with you! This was the first thing I did after the install but wasn't expecting the level of wear. My diff was making some fierce noises on low speed turns.


I am also on a schedule with the DCT fluid.
 

martymil

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Some years ago a few boys where complaining about the m3 diffs making noises with less than 30k on them, I always made them change the oil.

Some where thinking it was smart to go aftermarket fluid to come back because it was still grinding till I made them change to BMW stuff and after a few figure 8 maneuvers at full lock they went away.

Love the BMW maintenance schedule like a hot poker in the eye, they are either dumb as shit or crooked as fuck to rob you of your hard earned.

Jeep is no better, don't get me started on those losers.