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Thread: 5hp18 -> 5hp30

  1. #1

    Default 5hp18 -> 5hp30


    After overhauling a 5HP18 and doing some more neat modifications on the car, it's time to go for some bigger projects. In the future I will want to fit a BMW 4.0 V8 or 4.4 V8. The 5HP18 has a factory limit of 310Nm. It can just barely take a 3.0 V8.

    The 4.0 was always delivered with a 5HP30 gearbox (560Nm max.) and the 4.4 was delivered with a 5HP30 in the first year before the intermediate 5HP24 (440 max.) was released.

    A 5HP30 will be a direct fit into my car and a 4.0 transmission mount + drive-shaft will take care of the rest. Fitting a 5HP30 basically finishes the transmission-to-wheels part of a bigger engine swap and will give me a 560Nm box to handle a "little" 300Nm engine.

    Since the 5HP18 and 5HP30 are both fully electronic, I will need to do some electrical work aswell. The 5HP30 EGS/AGS module is identical to the 5HP18 module regarding size, shape and pin layout. The wiring down to the transmission is different as the 5HP30 has a totally different valvebody. The BMW Wiring Diagram System already showed me how I will have to change certain wires at certain connectors to ensure the proper signals are transferred back and forth. I foresee no real problem here.

    The car is not equipped with the anti-theft mechanism where EGS/AGS and DME have to be linked software-wise. So far, so good. I think I have this transmission swap properly on paper.

    The problem that I can not fix however, is that the 5HP30 will have to apply shift times and shift pressures based on the torque/RPM curve of my 3.0 V8. The EGS/AGS will be programmed to shift based ona 4.0 torque/RPM curve.

    Reason why I think this is a problem, is that if I would simply hook up the 5HP30, assuming all wires have been rewired correctly, it will time its shifts and pressures based on the throttle body sensor position and the Nm it expects to receive from a 4.0. Since it will receive far less Nm from a 3.0, it will possibly apply too much pressure.

    Can anyone tell me if the data for the load profile is stored on the EPROM in the EGS/AGS? If so, I would have to load the engine load data of the 3.0 onto the 5HP30 EPROM so that it's shifting and solenoid actuation is the same as with a 4.0 but now based on a 3.0 load profile.

    Can anyone with DME/DDE chiptuning or mapping in general tell me what these programmed variables look like?

    Hope to hear from you guys. Once I start working on a 5HP30, the pictures and videos will be online.

  2. #2
    Join Date
    Dec 2003
    Eastern Tennessee USi


    Can't help with tuning or mapping but you will need the large differential, output shafts and rear wheel setups unless you cut the driveshaft to work with the mid size diff.

    When I was looking into this swap it came down to popping in a manual 5 or 6 speed instead of the giant torque eating 5hp-30. Same driveshaft as for the 5hp-18.
    95 E34 530I V2.17
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3


    Yes, ultimately I will need to work on the rear end of the driveline aswell. For now I just want to have the 5HP30 working with my small engine. In the future I will do the rear end the way I want to. I will choose the diff internals that I want and fit them in a large house, with the large shafts with a 4.0 drive shaft. For now however, I focus 100% on the transmission itself.

    If a 5HP30 -> 3.0 will simply not work not even with some $$$, I will either beef up the 5HP18 and build a M60B35 based on M62 parts (just for the fun of it) or go directly 4.0+trans+shaft+diff+shafts.

  4. #4
    Join Date
    Feb 2006
    Oldham, England


    The TCM is going to monitor throttle position and load. I imagine that if it concludes it has a low powered 4.0 litre up front, it will just hang onto gears. I can't help with the mapping . But I think I may know a man who probably can. Owner is a member of a BMW forum and really does know his stuff. Maybe give them a try?:
    Oct '00 E46 330i. Feb '92 525i (departed)

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