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Thread: Building a L28 (NA)

  1. #101
    Registered User Travel'n Man's Avatar
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    How many HP does a person loose from the crank to the wheels? All the Dyno results that I have seen recently are to the wheels..........
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
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  2. #102
    Crumudgeon
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    Anywhere from 10 to 30%. The numbers are not directly comparable. Some of the better chassis dynos are very repeatable but none approach the accuracy of an engine dyno that is certified to either the SAE, JIN, or DIN specs.
    Last edited by John Coffey; 10-09-2014 at 08:17 AM.

  3. #103
    Registered User LeonV's Avatar
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    Quote Originally Posted by Travel'n Man View Post
    How many HP does a person loose from the crank to the wheels? All the Dyno results that I have seen recently are to the wheels..........
    Every dyno result you see is likely from a chassis dyno (to the wheels), unless it was on an engine dyno (e.g. Rebello).

    It's also completely useless to compare numbers from different dynos. Extrapolating "crank" numbers from chassis dynos is equally useless. I've seen as much as 50-60hp swings from the same car, with absolutely no changes made besides it being on a different dyno. A good example is an FC RX7 that came through our shop and pulled 125whp. At another dyno, it hit 175hp. That's a 40% difference!
    Last edited by LeonV; 10-08-2014 at 03:23 PM.
    2/74 260Z

  4. #104
    Lance Corporal of Marines TheCrazySwede's Avatar
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    Quote Originally Posted by Travel'n Man View Post
    How many HP does a person loose from the crank to the wheels? All the Dyno results that I have seen recently are to the wheels..........
    My stock 280 with EFI got 145whp. I would assume that would make it 175 @ the flywheel? That would make it a 11% difference.

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