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    • 2020 Toyota Supra's '2JZ Successor' BMW B58B30M1 3.0 inline-6 technical explanation - Engine code, Valvetronic, VANOS, twin scroll turbo, etc.

      This video does a pretty good job explaining the technical makeup of the BMW B58. The B58B30M1 variant to be exact with 335 horsepower and 365 lb-ft of torque. The video to the shock of BimmerBoost actually gets the BMW engine code breakdown and what each letter and number means pretty much correct.


      What it gets wrong or at least overemphasizes is the importance of Wards 10 Best awards for the motor. Wards emphasizes emissions and value, not performance. The engine award you want is the 2.5-3.0 liter category of the International Engine of the Year competition which BMW traditionally dominated until Porsche released their 3.0 liter 9A2B6 motor. The B58 has yet to win a single award in that competition.

      How about mentioning that the B58 output is underrated and it responds well to tuning? If claiming it is a '2JZ successor' (please don't do that, it's embarrassing for all of us) focus on how it will honor the 2JZ's lofty reputation which was built in the aftermarket primarily.

      The closed deck B58 design is touched upon and because the closed deck will not have the same cooling passages as the open deck N55 design it replaces a change in cooling strategy being necessary is stated. This is partially why the B58 goes to a water-air intercooler design from the N55 air-air.

      What about the decision for a closed deck compared to the N55 because the cylinder spacing is tighter with smaller bores and a much more undersquare design to try to keep the length of the motor shorter? Obviously BMW struggled to keep their traditional 50/50 weight distribution with the longer turbo I6 motors.

      The B58 is a twin scroll turbo design and if you want to read about twin scroll technology you can here. Essentially the basic idea is a single turbocharger getting exhaust pulses from all the cylinders rather than just one bank.

      BimmerBoost did a BMW B58 technical breakdown with more of a performance emphasis back in 2015.

      This is a good general overview video with some big omissions. The engine being underrated is not mentioned, what it has achieved in the aftermarket, or the huge new deal of the manifold being cast into the head somehow is not covered.

      Still, worth watching to learn about the motor and BMW's technology especially if one prefers video to text.


      This article was originally published in forum thread: 2020 Toyota Supra's '2JZ Successor' BMW B58B30M1 3.0 inline-6 technical explanation - Engine code, Valvetronic, VANOS, twin scroll turbo, etc. started by Sticky View original post
      Comments 6 Comments
      1. Eleventeen's Avatar
        Eleventeen -
        Sooo... 3JZ? 🤔
      1. Stevenh's Avatar
        Stevenh -
        If that isn't a thinly veiled puff piece than I don't know what is. I made it to the 3 second mark.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        If that isn't a thinly veiled puff piece than I don't know what is. I made it to the 3 second mark.
        He does a pretty good job explaining it although it's obviously not a tech showpiece vid or anything.

        It's good for general knowledge.
      1. 93siro's Avatar
        93siro -
        He didn't mention integrated turbo manifold.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 93siro Click here to enlarge
        He didn't mention integrated turbo manifold.
        Yep, that was one of the big omissions.
      1. quicktime's Avatar
        quicktime -
        Here's another cool video explaining the relationship between Toyota and BMW.