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    Dyno-diagramm

    My good ol' Turbo (108'000 km) got 'dynoed' last week. The results are pretty cool: 424 HP (DIN) and 591 Nm!... Peak values of course, but the measured torque is impressive. And yes, the engine is stock.

    Greetings,
    --Pierre


    Re: Dyno-diagramm

    Hi. I can't read the chart well... Can you tell me what
    drivertrain loss percentage was assumed (or measured)?
    In other words, I don't expect you got 424hp to the
    wheels, but that whatever you got to the wheels was
    multiplied by a factor tp compensate for drivetrain losses,
    and I am wondering what that was. Was this a 4-wheel
    dyno, ot a 2-wheel?
    thanks
    Joe

    Re: Dyno-diagramm

    Joe, this was a 4-wheel dyno. The power at the wheel was 305.3 HP (see 'Radleistung'). The loss ('Schleppleistung') was 89.7 HP, and this got normalized to 424.3 DIN HP.

    Greetings,
    --Pierre


    Re: Dyno-diagramm

    FIEREEEEEEEEEEEEEEEEEEEEEEEE

    Re: Dyno-diagramm

    Ok. So they found/calculated/assumed a 23% drivetrain loss
    meaning that the motor was producing 395hp at the crank
    to give you your actual 305hp. Then they adjusted the
    numbers for the less-than-ideal conditions, to state that under
    ideal conditions you'd get another 30hp at the crank, for 424.

    I am interested in the 23%. I hear mostly of 2-wheel dynos
    here. They disconnect the front drive shaft before testing.
    The measured drivetrain loss I hear about in those cases
    is about 15%, so 23% would seem to indicate a significant
    further loss from the front driveshaft to the front wheels.

     
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