VR6 Turbo Gearbox Solution 360-500WHP

Discussion in 'Engines' started by AlexOC, Apr 29, 2022.

  1. AlexOC New Member

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    Hi guys,

    I have been reading for a while everywhere.

    The setup is VW Bora vr6 2.8 24v 4x4(Haldex) gt35 Twin scroll 500WHP Target LPG+Gasoline Megasquit ECU
    Daily will run on 360WHP since it will use LPG(F this fuel prices) and that's the limit on the current LPG injectors (the biggest I found)

    It must be a daily driver and will be smashed from morning until evening and must NOT Brake (Often)

    Solutions :
    1. I would like to put Diesel (130PD/150PD from 1.9tdi) gearbox with Reinforced Fork(I heard they brake) BUT
    -The bolt pattern of the VR6 housing is different and adaptor plate is needed
    -If the inside of the diesel is moved to the vr6 housing will everything fit? did somebody actually do it?
    They claim it is possible but I can't find anybody who actually did it.

    2. Audi a4 2.7TDI Swap engines (TRANSMISSION ADAPTER PLATE, VR6 TO AUDI QUATTRO TRANS)
    - I can easily buy an a4 2.7TDI(Untill 2004) (that's the toughest Transimison since high NM in low RPM
    (I believe)***
    BUT how will all the dashboards heating windows ETC work?

    3. Audi Quattro DIF/Gearbox into Bora with an inverted engine to Longtitudal positon
    -Did anyone actually ever do it?
    -Is this possible?

    Which solution is the most efficient and realistic?

    Thanks, guys!
     
  2. Adamss24 Forum Member

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    Easiest would be to go DSG into your vr6 with stand alone converter, however vr6 gear no x bolt pattern is different so you will have to cut and weld the vr belljousing and weld it onto the dsg gearbox…this is a very, very precise operation and not as easy as it sounds because crank bearings need to be aligned otherwise they don’t last !
    The 2.7 tdi new style gearbox is not as strong as the old 01E getrag gearbox as fitted to the old 2.5 v6 tdi however it’s smoother. 01e will take easily 800nm and even more if it comes up the rev range !
    There has been a few longitudinal platforms which donated their driveline to various transverse platforms (Dahlback racing mated a 2.2 s2 inline 5 engine to a Quattro drivetrain) but it’s a lot of work and might not worth pursuing!
    probably best to get the gearbox out of the s3, Audi TT with the 2.5 turbo 5cyl engine and make it fit, these can take all the pounding without much fuss !
     
  3. AlexOC New Member

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    Thank you for your reply brother.
    Truth is the 2.5 t from RS is actually non-existening around here. I did search for parts or crashed one but NOPE.
    On the other hand, even if I find one it will be way above the budget and I have to take the gearbox and the whole 4x4 with hubs. so it will be priceyyey.

    I did find a guy who reinforced a 02M for vr6 and he seems well educated in the area. He himself has a vr6 500hp daily 6 months in already and it does not break. He made some kind of support for his first shaft (Final drive) because the 4th is the weakest gear and swapped the Final drive from a Diesel gearbox.(see photos)

    For the record 1.9tdi gearbox fits inside a vr6 gearbox.

    And yes my mistake its 2.5 TDI. Still, that sounds like the most reliable option but I would like to swap the vr6 into the a4.
    Currently, I am searching for an ECU magician who can create some kind of motherboard or device(emulator) to lie to the a4 ECU in order to remain functional. (Air-con windows/Speedometer etc.)

    Then I can easily swap the engines and put a Bora ECU+Mega.

    And finally, what do you think of the Gears(Gear-Wheels of the Diesel gearbox(Forgive my English)) Do you believe they are tougher than the Gasoline ones or made from a different material? I can't find any reliable info on the subject.
    I couldn't upload them idk why
    https://ibb.co/mvbr06v
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    https://ibb.co/PcP7h3Z
    https://ibb.co/x12LYjs
    https://ibb.co/SBdnWqn
    https://ibb.co/9W6wgC6
    https://ibb.co/ss9PwjD
    https://ibb.co/Jn7VRcr
    https://ibb.co/4S3NRB9
    https://ibb.co/QkFh4tS
    https://ibb.co/P6MFcBw

    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
     
  4. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    Problem with your question is the following:
    You speak WHP this and WHP that and do not realise that measurement is dimensionless without RPM.
    Gearboxes are rated warreneted torque.

    Bora 4x4, so a PQ34 car, like a EU Golf V6 4 motion, Toledo V6 AWD, 1J R32 Golf, Audi 8L S3 and 8N TT.
    All of those run a MQ350 "02M" Gearbox, rated up to 400 Nm or so warrented. You can run more through them, but you are on your own for the level of shock required to strip the 4th gear, or break a fork.

    I run a V6 4 motion gearbox with a V6 DMF, 4 puck Sachs cluctch and Luk pressure plate on a 646Nm 3.2T
    This car has been driven daily as of recent as today. The gearbox is actually standard.

    The thread is here.

    Good luck
     
  5. AlexOC New Member

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    Thanks, I see your thread is very well written. I will go through it and make marks.
    Yes, I am aware that NM is the devastating element in low RPM. Not HP in high revs.
    I will be running a twin-scroll gt35 (t4 housing)so I'm hoping for an early spoon and as wide as possible usable rpm range.
    If I can put between 400-500NM on 3000/3500RPM I will be really happy since that's around 200hp for a start.
    And it was warranted on What rpm to deliver this 400nm? Cuz up the rev range nm are more forgiving ...

    P.S Does the 6-speed version has a fork as well? Somebody told me nope.

    Have a nice one.
     
    Last edited: May 3, 2022
  6. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    By "warrented", I mean as a production vehicle.

    Non of the 02M gearbox cars, developed over 350Nm or had vehicle resistance for over 1600kg.

    All things being equal @ 2000 mbar boost with that turbo, full load , from 3200 rpm, your engine could be be at up to 530 Nm, pending component choice and the knowledge to match it all with calibration.

    If power numbers are your thing, a full load 500 bhp, 450 bhp/ps/whp/cv/hk, i.e. the rate at which torque is developed, depending on manifold pressure available, cylinder fill, turbine AR and your abillty to calibrate engine hardware properly, would occur between 6000 to 6400 rpm.
    All things being equal.
    That is just one aspect of vehicle calibration. You will still have the rest of work to do [:D].
     
  7. Adamss24 Forum Member

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    On my pd150 golf mk2 I am using a 6 speed gearbox, I run 350-360bhp/650Nm and the gearbox survived so far. The 4th gear support is a nice addition if it does indeed work, however on mine I broke twice the inner ball cages on the cv joints and once sheared the output flange clean on a hard launch ! I would say with mechanical sympathy a 6 speed gearbox should last without much bothers. They are also cheap to replace if they go tits up !
     
  8. drunkenalan Paid Member Paid Member

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    Surely as the clubs resident Gearbox guy, Martin would be the best person to speak too.

    search up Gas n Gears, he is a business though so bare that in mind, when quizzing him, his time is his money.
     

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