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HP loss from motor to wheels

Discussion in 'General Tech and Maintenance' started by webink_EK9, Jul 22, 2004.

  1. webink_EK9

    webink_EK9 Senior Member

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    Whats the aprox HP loss from crank to wheels? I put around 181 to the wheels on my last dynojet run and I was wondering what my motor would be pushing.
     
  2. bklyneg

    bklyneg Senior Member

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    i think 14%. others will be different.
     
  3. webink_EK9

    webink_EK9 Senior Member

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    So is that about right? 14% loss as general for a b18c itr
     
  4. jamesA

    jamesA Well known pissed off telephone guy VIP

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    15% for FWD, 25% for RWD (i think), 40% for AWD cars...
     
  5. nismogod

    nismogod Senior Member

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    as a rough estimate of course.

    i find it hard to believe tho, that a STi only has 180whp factory. not to argue, just thinkin lol.
     
  6. JDMilan

    JDMilan Senior Member

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    FWD = in the range of 12-16%....don't know exact
     
  7. JDMilan

    JDMilan Senior Member

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    also note that different dynos will yield different HP/TQ figures...
     
  8. nismogod

    nismogod Senior Member

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    from what i have gathered from alot of ppl, approx power loss is roughly 15% on any setup. AWD may be slightly higher. My buddy todd did an engine dyno and a wheel dyno, with a small block V8. Had a turbo400 and a ford 9"(both of which are HUGE power robbers in comparison to other things) and lost ~16%. RWD
     
  9. Havok

    Havok Senior Member

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    AWD loss is around 20-25%, 40% is WAY too high
    FWD I want to say is around 10-12%
     
  10. lowandslow

    lowandslow Senior Member

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    yea, 40% is too high..i was gonna estimate about 25%
     
  11. nismogod

    nismogod Senior Member

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    that sounds better. roughly 12%-17% FWD and RWD. probably around 20ish % AWD
     
  12. asmallsol

    asmallsol Super Moderator

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    fI have always heard that FWD is closer to 18%. RWD will rob more power, simply because you have more moving parts
     
  13. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Uh, no. I'm looking at my roommate's dyno chart right now: 236.3hp @ 5750rpm and 228.3lbft @ 4750rpm. That's totally stock.
     
  14. jamesA

    jamesA Well known pissed off telephone guy VIP

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    um yeah thats why I put the (i think) cause I couldn't remember... someone babbled that out at me and I didn't believe them either after doing the math.

    So roughly by your Roommates Dyno chart his AWD only lost him 21.3%
     
  15. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Approximately... but the techs at the dealership (the ones that really know what they're talking about) estimate the stock power output at something like 320-330hp, not 300 as advertised.
     
  16. nismogod

    nismogod Senior Member

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    yikes, thats mad power loss.
     
  17. JDMilan

    JDMilan Senior Member

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    it is and it isn't, it all varies.............either way dyno it and let us know.
     
  18. jamesA

    jamesA Well known pissed off telephone guy VIP

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    :werd: but remember every dyno is going to be different.

    SCC did an article on this with a Ranger.
     
  19. smooth95

    smooth95 Senior Member

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    That is a lot of hp loss
     
  20. jeffie7

    jeffie7 Wrong Whole! VIP

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    Around,......


    12-15%FWD 15-20% RWD and 20-25%AWD

    oh P.S

    350Z makes 287crank HP.

    Fully stock 350Zs dyno from 230-250 range depending on if you get a good one =)
     
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