Featured Engineering Explained: B58 Engine

Discussion in 'B58 6-Cyl Engine, Exhaust, Drivetrain, Bolt-Ons' started by JustaCarguy., Jan 23, 2019.

  1. MA617M

    MA617M Well-Known Member

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    direct injection ftw
     
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  2. mrarm

    mrarm Well-Known Member

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    I now more cr = more power more efficiency for atmospheric engine.
    But more cr include less turbo over boost :dunno:
     
  3. mrarm

    mrarm Well-Known Member

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    The actual Supra with cr11 and max theoretical cr 13
    The Supra have a theoretical overboost at 13/11-1 = 0.2bar
    If the stage 1 is at 400hp.

    Supra + shim
    With a shim with cr 8,5 and max theoretical cr 13
    Supra have 13/8,5-1 = 0,5 bar.
    Stage 1 + shim is at 400x(1,5/1,2)=500hp

    It’s a theoretical value and static not dynamic
     
  4. 93Siro

    93Siro Active Member

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    Yeah. Better response and better spooling. It's all about managing the heat, and DI's are great at that.
    10.2:1 CR and 25psi here.
     
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  5. mrarm

    mrarm Well-Known Member

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  6. Guff

    Guff Moderator
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    Ran 10.5:1 on my 2JZ, 27psi of boost on a 67. Made 707whp on SP's mustang dyno and it was a response monster. High comp is the way to go!

    I for one will be the one building my B58 to 12:1 lol. The DI system in this car is stupid high pressure, so injection atomization is likely going to be great. Volume is the only thing that concerns me, with no supplemental port injection like on the 86. But the Bimmer boys seem to be handing that fine, so we'll get over that hurdle too.
     
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  7. PerformanceSound

    PerformanceSound Well-Known Member

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    Yeah, I was worried about the DI only aspect of the B58 as well. It would be nice to have a set of port injectors as well to avoid any carbon build up on the valves. Other than that, I agree DI is the way to go. Also, we can always go the M3 route and do water injection ;-).
     
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  8. kona61

    kona61 Well-Known Member

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    Water meth injection with a JB4 controlling is the cheap and easy way to go. Plus logging capabilities are welcome.
     
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  9. McWicked

    McWicked Well-Known Member

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    I'm more worried about the block. More specifically, the "spray on" cylinder liners. If you get a detonation event, bad enough to snap a ring land, then the bore liner is toast (and by extension the block). However, if there's enough meat between the water jackets and the bore, we might be able to machine the block for standard inserts. No doubt some enterprising young mind is already hard at work on this. We'll see.
     
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  10. kona61

    kona61 Well-Known Member

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    Again I will point out the VR38DETT also is aluminum, also has no liners, also has plasma sprayed super thin bore coatings, and it is capable of absolutely stupid amounts of power.
     
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  11. McWicked

    McWicked Well-Known Member

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    If memory serves, the VR38DETT has one or two aftermarket cylinder sleeves available. Please correct me if I'm wrong.
     
  12. 93Siro

    93Siro Active Member

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    We need to know what will be the fuel cap on OEM HPFP, probably around 600whp with meth (on S55 you can get almost up to 750whp with race gas and meth). The easiest upgrade would be get a PI kit and let JB4 handle DI+PI injection. I am confident though down the line XDI will make a HPFP upgrade that adds a nice chunk of room above that.
     
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  13. kona61

    kona61 Well-Known Member

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    Yes, Darton makes some. But I think that it will be a while before anyone feels the need to upgrade liners.

    The B58 Revision has a much higher HPFP pressure at 5000 psi. That is 2,100 more than the old B58 and
     
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  14. PerformanceSound

    PerformanceSound Well-Known Member

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    Correct. A quick walkthrough over at GTRLife will show just how rarely liners and/or sleeves are utilized in a VR38 (if at all) with 1000hp+. It is one hell of a motor.
     
  15. mrarm

    mrarm Well-Known Member

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    Bmw building B58 High comp 11:1 to S58 low comp 9.3:1 for more than 500whp :popcorn:
     

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