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Thread: E36 - M50b20tu Turbo

  1. #1
    Join Date
    Sep 2018
    Location
    Germany
    Posts
    7
    My Cars
    BMW e36 - M50b20tu turbo

    E36 - M50b20tu Turbo

    Hey guys, I am David from Germany and wanted to share my ongoing project with you, an e36 318i going M50b20tu Turbo.

    I am trying to make a lot of pictures, so hopefully someone else can gain something from here .

    Base:
    - e36 318i

    Mods:
    - M50b20tu
    - stock pistons
    - 2x Head gasket with decomp plate
    - Clutch & Flywheel - e*** ftw
    - Holset HX35W
    - Selfmade Topmount Manifold
    - 440ccm injectors
    - Ecumaster DET3
    - RSR Performance widebandlambda KIT with LSU 4.9
    - Compression Ratio around 8,5:1

    The Plan is to run about 1,2-1,5 bar of boost in closed loop and hopefully more than 320hp .

    The pictures show the car atm, some "toys", the engine ( thats what i did yesterday, nothing special just time consuming) and the draft of the new coolant circuit.

    see ya later.

    Edit: I will update the first post with the newest information, to keep things clean here..
    Attached Images Attached Images
    Last edited by LeereLimo89; 04-07-2019 at 10:36 AM. Reason: Changing plans

  2. #2
    Join Date
    Sep 2018
    Location
    Germany
    Posts
    7
    My Cars
    BMW e36 - M50b20tu turbo
    Some Update on this:

    The Manifold is ready soon, have to do the last welds. The Turbo will go through the hood.. ARP Head Studs with decomp + 2x Gasket. More updates coming


    20190316_125923707_iOS.jpg
    20190404_121818633_iOS.jpg

  3. #3
    Join Date
    Nov 2011
    Location
    Greece
    Posts
    78
    My Cars
    2001 530
    7.3:1 compression? why?
    anything lower than 8.5:1 is useless.

  4. #4
    Join Date
    Sep 2018
    Location
    Germany
    Posts
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    My Cars
    BMW e36 - M50b20tu turbo
    The compression ratio was pretty much the result of combining the crankshaft, pistons and rods. But i havent told you that the engine is a stock m50b20tü with just the decompression plate now to keep it simply at first. My fault sorry.. big injectors, ecu etc are staying the same.

    Cheers

  5. #5
    Join Date
    Aug 2012
    Location
    Estonia
    Posts
    51
    My Cars
    1995 BMW E34
    I tested the same parts in my engine and it worked just fine. Its not useless, its not necessary*.
    https://www.instagram.com/p/BqConDhg2CV/

  6. #6
    Join Date
    Sep 2018
    Location
    Germany
    Posts
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    My Cars
    BMW e36 - M50b20tu turbo
    When calculating with the formula for the otto cycle, it basically is as Raimo says. Its not necessary, but you dont loose much if you go down till 6:1..

    8,5:1 seems to be a common value, but i dont get why this seems like some kind of religion... especially on boosted cars you gain much headroom with low CR

  7. #7
    Join Date
    Nov 2011
    Location
    Greece
    Posts
    78
    My Cars
    2001 530
    yeah you're right. i used wrong word but you got the meaning.
    personally i wouldn't go lower than 9:1 unless regular pump gas was obligatory.
    currently i'm on 17-18 psi on stock engine with 100 octane and water injection.

  8. #8
    Join Date
    Sep 2018
    Location
    Germany
    Posts
    7
    My Cars
    BMW e36 - M50b20tu turbo
    You can do that basically when you have a good ecu etc. Since i am just using the DET3 and dont have the capabilities and money to do proper dyno finetuning, i stick to low compression to not kill the engine with too much boost and a „not super perfect“ ignition map. Since the power difference is max. 5% (calculated) i am fine with the low compression and enough headroom to give it some more boost if i want to..

    Cheers mate

  9. #9
    Join Date
    Jan 2020
    Location
    milan italy
    Posts
    1
    My Cars
    z3 1995
    hi sorry can you tell me how did you connect det3 to the control unit? i have been trying for two weeks and it is not receiving rpm from the cas sensor ????

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