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  1. #76
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    1 out of 1 members liked this post. Yes Reputation No
    Best part about GC's? 2 vbands... Pull Turbo's to pull the head, AINT no one got time for that...
    Click here to enlarge
    Vargas Turbocharger Technologies
    N54 1/2Mile World Record: 169.9MPH
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  2. #77
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    Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
    Best part about GC's? 2 vbands... Pull Turbo's to pull the head, AINT no one got time for that...
    Click here to enlarge
    Probably way easier to get the head back on too...

  3. #78
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    @Sticky That's what i thought, just an isolated incident. I talked to a local tech at BMW recently and he just said they were aware of the issue. Dont hear ppl post about it for the N54 though.
    2010 135i, 6MT, VRSF 7"FMIC/VRSF DP's/VRSF Charge Pipe/Stock DVs/Helix Style Hybrid intake/ JB4 E40

  4. #79
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    Click here to enlarge Originally Posted by Sabre Click here to enlarge
    Dont hear ppl post about it for the N54 though.
    That's what confuses me too.

    I mean, we have essentially three motors with a similar design. The N54, N55, and S55.

    On the S55, we see the hub issue far more often.

    The N54 avoids it much better or at least it has until recently with higher power builds showing issues.

    I don't really know what to think and I don't even really understand WTF BMW is doing.
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  5. #80
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    On the S55, we see the hub issue far more often.
    Just a guess, higher RPM = more stress exasperates the issue.

    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    The N54 avoids it much better or at least it has until recently with higher power builds showing issues.
    The GC puts down so much low end torque, the increased transient response (how quickly the revs climb) puts extra stress on the sprocket and spins it.

    Just a guess..Click here to enlarge

  6. #81
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    Big tq down low probably what did Tony motor in.
    Click here to enlarge

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  7. #82
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    The motor itself is fine, just the crank hub. Once you build these they can take a lot of power, and tq. I have no problems with this motor going in, then all my issues stemmed from it slipping once, and it messing up the crank
    Vargas Turbocharger Technologies
    N54 1/2Mile World Record: 169.9MPH
    N55 World Record: 11.4 ET / 123MPH(AT) - 11.7ET / 122.7MPH(MT)
    N54 Stock Frame (100% E85) World Record: 699WHP / 714WTQ
    N54 Twin Turbo World Record: 804WHP/ 761WTQ
    N54 (ACN 91 octane only) World Record: 585WHP / 537WTQ
    Click here to enlargeClick here to enlarge Website - Email
    #VTTDOMINATION #VTT #VARGASTURBO #VTTBOUNTY

  8. #83
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    If I'm understanding correctly you need a new crank and hub?

    Why is a spinning crank hub a death sentence for the motor in other situations?
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  9. #84
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    Click here to enlarge Originally Posted by hydra Click here to enlarge
    That's a terrible design. The way the LS peeps address the issue is to drill a hole lengthwise into the hub/crank to fit a dowel/key, without introducing anywhere near as much of a (failure-prone) stress concentration as the solution above.
    Dude! I was thinking the same thing. If I could rep you I would.
    Back in my DSM days we would have crank bolts back out at high HP. There were three known solutions, key it, safety wire or tack weld all of course with some red loctite.

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