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Found 1 result

  1. V_MAX

    M50 Manifold on M52 Engine

    From the album: My 523i Conversions and Maintenance

    This was a fun project First I had to find a good M50 manifold and modify it so all the pluming would work. I also had to make some modifications to the power steering reservoir and fuel rail bracket. Sins writing this in 2015 I have changed the fuel injectors to 49% larger injectors and remapped all the fuel maps. The result was a better fuel economy and better emission numbers. Sins everything was taken apart I made the decision to renew all the rubber hoses and new refurbished fuel-injectors at the same time. The rest was more or less plug and play. Obviously there was a little loss of torque under 3500rpm. but after that there is a lot of gain in hp. Unless you are driving a lot on steep roads for longer time, then I highly recommend this conversion. The only way to compensate for the loss of torque is replacing both of the standard camshafts that came with the M52b25 with to new/used ones; intake cam from M54b30 for the intake and another INTAKE cam from M50NV for the EXHAUST sound crazy but that is the rout to go. You have to do minor modifications on both of the replacement cams. After having made this conversion I have found out that I have maxed out my fuel injectors A/F, they are the green Bosch (0 280 150 415) capable of around 166cc, (sorry for my mistake, I had written earlier, pink injectors (0 280 150 440) that are 208cc) so I am going to replace them with bigger ones, probably Bosch 0 280 155 830 capable of around 360cc and remap accordingly the ECU with MLV and RomRaider. One other thing I should mention, if you have to change to larger fuel injectors due to fuel starvation then you have to make modifications to the fuel maps and possibly some other parameters in the ECU, so the message is; do not change to higher capacity fuel injectors in hope of getting more horses out of the engine. In almost all cases, then the standard injectors that came with the engine are cable of deliver more than enough fuel, despite some standard or minor tuning, unless you are going for a turbo, or as in my case, larger cams and intake manifold and headers with free flow exhaust and a rather small injectors capable of only 166cc. After making this modifications I would like to suggest that the ECU should be remapped/tuned by someone who knows what he or she is doing to get the most Hp. out of this modifications. With new larger fuel injectors, you HAVE to remap the ECU, there is no way around it. You can just let it be as it is with only the M50 manifold swap and the current fuel injectors and you will get some adaptation up to a certain point from the ECU, but nothing near the full benefits with remapping the ECU. You can read more about the cam replacement in my portfolio. All I need now is a COMPRESSOR
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