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  1. #1
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    BMW updates all N63 V8 Turbo cars to the 445 horsepower N63TU motor for 2013 except the 2013 X5 50i and X6 50i

    BMW introduced the N63TU (technical update) motor with the 6 Series Gran Coupe. The N63B44TU gets its power boost from the addition of Valvetronic (variable valve lift system which replaces the conventional throttle butterfly) and new tuning. As expected, this updated motor will be going into all N63 vehicles such as the 550i, 550GT, 650i, and 750i. Curiously absent are the X5 and X6. Why BMW would continue to give them the standard N63 when they are replacing this motor in all other models we have no clue.

    The horsepower boost is very nice but the new Valvetronic motors have yet to display an advantage in aftermarket tuning. The newer N55 turbo six with Valvetronic versus the N54 twin turbo without Valvetronic being a good example of this. It may not be a bad idea for perspective buyers to get a good deal on the models without the newer motor and simply do an aftermarket tune.

    Click here to enlarge
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    Vanos is variable valve timing
    Valvetronic is variable valve lift

    The only real advantage of valvetronic on a forced induction engine is better fuel economy.

  3. #3
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    Click here to enlarge Originally Posted by BMWJunkie Click here to enlarge
    Vanos is variable valve timing
    Valvetronic is variable valve lift

    The only real advantage of valvetronic on a forced induction engine is better fuel economy.
    Sometimes even when I proofread things slip by as my mind is processing it as I intended it and not as I wrote it. Have no idea why I wrote timing with replacing the throttle body. Correcting it, thanks.

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