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  1. #1
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    Next Potential Project: AT to MT Trans swap

    I am in the very early stages of looking into this as a possibility. I have sourced a few 6MT's from salvage for around 2k +/- a few hundred depending on mileage ect. I saw on e90 that someone had done a swap on a 535 successfully with no codes and no real drama. Any info on pricing, parts required or knowledge of tranny conversions will be welcome. Setup is in the sig below. My goal is to run vtt-s2 on high boost or with a small shot of nitrous, this I believe will spell disaster for the AT very quickly.
    SYVECS Standalone l Motiv Port Injection with Fuel It Stage 3 LPFP l MFactory LSD l CFS Racing Radiator l m3 front and rear control arms l ST Coilover System Vargas Stage 2+ Fully Upgraded Turbos l Vargas Inlet System l VRSF DP | VRSF FMIC | Alpina TCM Flash | BMS Trunk Meth l Nitrous Express Dry l Evolution Raceworks Charge Pipe with n20/meth bungs l Vargas HPFP Upgrade v1 l Agency Power Exhaust with n55 mid pipes l Apex AERO-7 Lightweight Wheels l Toyo R888s



  2. #2
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    Hopefully this works out & comes out clean, could become a blueprint for future AT --> MTs
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  3. #3
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    Click here to enlarge Originally Posted by Njz Click here to enlarge
    I am in the very early stages of looking into this as a possibility. I have sourced a few 6MT's from salvage for around 2k +/- a few hundred depending on mileage ect. I saw on e90 that someone had done a swap on a 535 successfully with no codes and no real drama. Any info on pricing, parts required or knowledge of tranny conversions will be welcome. Setup is in the sig below. My goal is to run vtt-s2 on high boost or with a small shot of nitrous, this I believe will spell disaster for the AT very quickly.
    look around a bit more you should be able to get <30k mi for <$1000

    check ebay UK, i got one (to australia) shipped for $1200. so $1000 with the cheaper shipping to the states.

    you'll need a fair bit, i can't list it all off the top of my head.. by the clutch pedal/cable, shifter, shift linkage shifter trim, clutch itself. i'd budget a good hmm $4-$5k at least for it? counting a good clutch and flywheel.

    there WILL be codes but they can obviously be coded out (go into the DME and basically just set it from AT to MT in whatever setting... very simple) otherwise it'd be expecting signals from the 6AT control box and obviously not getting them (so seeing it as broken)

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    I was going the same route when my trans belw until I saw the priceing... almost exactly the range @Flinchy stated it to be with good clutch and flywheel.
    Coding wise I would think its just turning off AT values from on to off(as someone explained to me), I was looking into doing this when I blew my AT but it was ALOT cheaper to get a used AT, upgrade VB and torque converter. Folks at the shop turned on my car without a VB to move it (power steering) lol cant remebr the codes I got but it lit up the dash haha. when I go VTT stage 3 im probably going to keep my AT till she blows again but will have a MT handy. It would be great to take pictures along the way! and update with as much info as possible! and the 535i that did it was an XI i believe so If an XI can do it RWD shuld be cake!
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    0 out of 1 members liked this post. Yes Reputation No
    You will also need a differential from a MT car as the final drive is different.
    From all the things I've lost,
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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    You will also need a differential from a MT car as the final drive is different.
    and a LSD lol

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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    You will also need a differential from a MT car as the final drive is different.
    Well you don't need to do that if you don't want to. A couple of guys changed their MT diffs to AT diffs.
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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    You will also need a differential from a MT car as the final drive is different.
    you won't NEED it... in fact most people would consider 3.46 an upgrade for the 6MT. shorter ratios = better acceleration in a lot of situations. stock turbo/rb/stage 2 may benefit from the broadened (relatively short in reality) power band though.

    do way better skids? haha

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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    You will also need a differential from a MT car as the final drive is different.
    NOT really... Especially if you want optimal acceleration, the AT Final Drive is better (the MT Final Drive will shine during 60-130 "Mexico" pulls). That's why Shiv swapped it into his personal car. But an LSD is a must, especially for anything beyond Stock Snails
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    1 out of 1 members liked this post. Yes Reputation No
    Let us know how it goes. I would just sell it and buy a MT, it it'll likely be cheaper and you can recover your costs, unlike with a MT swap.
    Change is constant

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    Click here to enlarge Originally Posted by The Ghost Click here to enlarge
    Let us know how it goes. I would just sell it and buy a MT, it it'll likely be cheaper and you can recover your costs, unlike with a MT swap.
    Thats what I'm gunna do. I thought about swapping my e90 to an MT but came to the conclusion an 09-10 135 Msport would be more fun. OP good luck though, I hope you pull it off. I can understand people that have a bunch of cosmetic mods or really like their cars color/options wanting to try a MT swap. Best of luck!

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    Click here to enlarge Originally Posted by The Ghost Click here to enlarge
    Let us know how it goes. I would just sell it and buy a MT, it it'll likely be cheaper and you can recover your costs, unlike with a MT swap.
    welll.. you can also sell a decent condition AT box for about $1k? haha that's a SLIGHT recovery >_>

    +1 to sell and get an MT, just take all your shiny parts with you?

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    Selling the car and getting an MT would be ideal but my car was in a pretty significant accident (total damage 23k) and I would not get as much for it as I would want so I am somewhat married to this car for better or worse now. I do not plan on getting rid of this at any point, this will likely be a project car of mine long term as the platform continues to advance and engine blocks/breakable parts get cheaper I feel this is a good platform to stick with for my purposes. If I can get the transmission issues sorted (not that I have any atm...but its inevitable)than I can start to refocus on other areas such as a forged internals and vtt s3 down the road.

    Link to my accident thread.....http://www.bimmerboost.com/showthrea...urrection-time
    SYVECS Standalone l Motiv Port Injection with Fuel It Stage 3 LPFP l MFactory LSD l CFS Racing Radiator l m3 front and rear control arms l ST Coilover System Vargas Stage 2+ Fully Upgraded Turbos l Vargas Inlet System l VRSF DP | VRSF FMIC | Alpina TCM Flash | BMS Trunk Meth l Nitrous Express Dry l Evolution Raceworks Charge Pipe with n20/meth bungs l Vargas HPFP Upgrade v1 l Agency Power Exhaust with n55 mid pipes l Apex AERO-7 Lightweight Wheels l Toyo R888s



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    I wish you luck if you are serious.

    Auto to manual has been and is way easier than manual to auto.

    It can be done, update us with what you intend to do.

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    Click here to enlarge Originally Posted by Njz Click here to enlarge
    Selling the car and getting an MT would be ideal but my car was in a pretty significant accident (total damage 23k) and I would not get as much for it as I would want so I am somewhat married to this car for better or worse now. I do not plan on getting rid of this at any point, this will likely be a project car of mine long term as the platform continues to advance and engine blocks/breakable parts get cheaper I feel this is a good platform to stick with for my purposes. If I can get the transmission issues sorted (not that I have any atm...but its inevitable)than I can start to refocus on other areas such as a forged internals and vtt s3 down the road.

    Link to my accident thread.....http://www.bimmerboost.com/showthrea...urrection-time
    woahhh that price would be damn close to a full new (second hand) never-crashed 135i lol

    reasurring though, that they can suffer THAT much damage and the engine's still fine? amazing!

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    yeah well i didnt pay for the damage the insurance company covered all but 1k of it and the shop gave me a 500$ break on the deductable. I was out shopping for cars a few days after the accident because I had no idea they would even consider fixing it at first glance. Oh well, its fixed now and is running very strong so we shall see. If I hadnt got the AT for such an amazing deal I would have had the MT in the first place. CPO 12k miles M-Sport package 28k back in 2010.
    SYVECS Standalone l Motiv Port Injection with Fuel It Stage 3 LPFP l MFactory LSD l CFS Racing Radiator l m3 front and rear control arms l ST Coilover System Vargas Stage 2+ Fully Upgraded Turbos l Vargas Inlet System l VRSF DP | VRSF FMIC | Alpina TCM Flash | BMS Trunk Meth l Nitrous Express Dry l Evolution Raceworks Charge Pipe with n20/meth bungs l Vargas HPFP Upgrade v1 l Agency Power Exhaust with n55 mid pipes l Apex AERO-7 Lightweight Wheels l Toyo R888s



  17. #17
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    I can only imagine trying to launch 1st gear on a 6MT with a 3.46 rear. Won't be fun.

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    RE gears since the 135i is going to be slow for a few months I'm thinking of moving the Quife / 3.46 diff over to the MT E92. Then once the VT3s are in I'll evaluate the gear situation for the 1. Maybe start with 3.08s though. The problem with 3.46s is it will be limited to ~130mph in the 1/4. But with 3.08s, it will be over geared at ~150mph. Still, better over geared than under geared.

    RE: The MT swap, I'd just sell the car and buy another one personally. It's easier. Click here to enlarge
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    Cool idea but this is not going to be easy. Isn't it going to be a $#@! with the ECM when it see's that something is totally different. The sensors and lines for the master slave etc. As others have stated, I would just buy a MT car. If this was an E30, that's not a problem.
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    I'm subscribed. I'll be doing this potentially as well later Click here to enlarge
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    Someone here on the island did it. Said it wasnt all that hard and it was coded to MT.

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    As stated above under normal circumstances I would just trade up for a MT but the accident will ruin my value for trade. A 535xi on the island did this with little headache per e90.
    SYVECS Standalone l Motiv Port Injection with Fuel It Stage 3 LPFP l MFactory LSD l CFS Racing Radiator l m3 front and rear control arms l ST Coilover System Vargas Stage 2+ Fully Upgraded Turbos l Vargas Inlet System l VRSF DP | VRSF FMIC | Alpina TCM Flash | BMS Trunk Meth l Nitrous Express Dry l Evolution Raceworks Charge Pipe with n20/meth bungs l Vargas HPFP Upgrade v1 l Agency Power Exhaust with n55 mid pipes l Apex AERO-7 Lightweight Wheels l Toyo R888s



  23. #23
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Cool idea but this is not going to be easy. Isn't it going to be a $#@! with the ECM when it see's that something is totally different. The sensors and lines for the master slave etc. As others have stated, I would just buy a MT car. If this was an E30, that's not a problem.
    Once everything is installed cleanly (the difficult part), it's easily just recoding the DME to recognize the car as an MT instead of an AT.
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  24. #24
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    Dont think its all that complicated to do. Then again i work on these so yanking a trans out is not a big deal to me lmao

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    RE gears since the 135i is going to be slow for a few months I'm thinking of moving the Quife / 3.46 diff over to the MT E92. Then once the VT3s are in I'll evaluate the gear situation for the 1. Maybe start with 3.08s though. The problem with 3.46s is it will be limited to ~130mph in the 1/4. But with 3.08s, it will be over geared at ~150mph. Still, better over geared than under geared.

    RE: The MT swap, I'd just sell the car and buy another one personally. It's easier. Click here to enlarge
    3.15 M diff/subframe be a good idea?

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