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Detroit, 11:52 PM
Mon Dec 7
30 posts in the last 24 hours

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  • posts about #testing more →

    Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R

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    Dsmvwl  Admin  Promote to frontpage Approve user Ban user ×
    Image of nick2ny nick2ny
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    But if the car is in neutral, the transmission isn't spinning. So this device just measures the drag of the driveshafts and wheels spinning. PLUS... aren't driveline losses really just because of the rotational inertia of the parts of the transmission? I think that the act of accelerating the spinning parts in the transmission is what takes all the power. Otherwise the transmission would get really, really, incredibly hot. There isn't that much friction in there...


    Color me unimpressed.

     Reply
    nick2ny was starred nick2ny was unstarred
    Image of philibuster philibuster
    12/30/08

    @nick2ny: It does get hot. That's why you have transmission oil coolers.
     Reply
    philibuster was starred philibuster was unstarred
    Image of nick2ny nick2ny
    12/30/08

    @philibuster: I know it gets hot. that's why i added "really really incredibly" in front of hot. Are you disagreeing with the rest of my post?
     Reply
    nick2ny was starred nick2ny was unstarred
    Image of TexanIdiot25- needs moar horse powah TexanIdiot25- needs moar horse powah
    12/30/08

    @nick2ny: Depending on the transmission, but it's gears are still spinning to some extent. While your driving gear is out, the rest of the trans still rolls with the drive shafts. This is why on an automatic car that if you tow it and the drive wheels are spinning, you must disconnect the drive shaft. Even in N, the trans gears are spinning. Of course, with the enigne off, there's nothing to pump the trans fluid and that burns up trannies while towing.
     Reply
    TexanIdiot25- needs moar horse powah was starred TexanIdiot25- needs moar horse powah was unstarred
    Image of TheBrewPub TheBrewPub
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    I like the name: Hyper Power International.


    Makes me think I can harness the energy from my children and sell it somehow. Is that tantamount to child labor? They're just burning it off anyway!

     Reply
    TheBrewPub was starred TheBrewPub was unstarred
    Image of Paul Y. can't get in the club; gotta parking lot pimp Paul Y. can't get in the club; gotta parking lot pimp
    12/30/08

    @TheBrewPub:

    I recommend using kids' energy to power a giant drill to bore straight into hell.
     Reply
    Paul Y. can't get in the club; gotta parking lot pimp was starred Paul Y. can't get in the club; gotta parking lot pimp was unstarred
    Image of Boosted Lego Wagon Boosted Lego Wagon
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    I can measure drivetrain loss on a GT-R too: use launch control? Lose your drivetrain.
     Reply
    Boosted Lego Wagon was starred Boosted Lego Wagon was unstarred
    Image of Ash78, cube farmer Ash78, cube farmer
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    If I stare directly at those dyno roller wheels, the GT-R is a very attractive car in my imagination.
     Reply
    Ash78, cube farmer was starred Ash78, cube farmer was unstarred
    Image of Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face.
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    It would be interesting to see a third party test the manufacturers claims by running a car on this rig, pulling the engine and running it on a stand dyno, then comparing the numbers.
     Reply
    Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. was starred Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. was unstarred
    Image of Doshu Doshu
    12/30/08

    @Mike the Dog: I thought the whole point of this rig is that they don't need to pull the engine.


    As for the numbers? From what I'm reading, it appears to confirm that Nissan's numbers are correct.

     Reply
    Doshu was starred Doshu was unstarred
    Image of Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face.
    12/30/08

    @Doshu: I meant as a means of independently verifying whether or not their method of calculating driveline losses was somewhat accurate or just a bunch of BS. It's easy to say you're calculating driveline losses accurately when you know what the numbers on both ends of the equation should be.
     Reply
    Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. was starred Mike the Dog is sitting by the door with a pair of cow slippers, and a very sad face. was unstarred
    Image of six six
    12/30/08

    In reply to Hyper Power International Dyno Claims First Accurate Measurement Of Driveline Losses With Nissan GT-R
    Next thing we hear from Nissan: testing on the Hyper Power International dyno will void your warranty.
     Reply
    six was starred six was unstarred
    Image of cyclopticgaze cyclopticgaze
    12/30/08

    @six: The GT-R's GPS receiver knows the positions of all the Hyper Power International dynos in the world. When it senses that your GT-R is on one of these dynos, it automatically de-tunes the engine.
     Reply
    cyclopticgaze was starred cyclopticgaze was unstarred
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