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    Thread: Dyno Research from 2002-2011

    1. Geriatric Member Chapel's Avatar
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      01-21-2011 05:47 PM #1
      I've been researching dynos for YEARS. I think at this point I'm nearly 9 years of testing and researching.

      Before I go into a ton of detail, I thought I'd share some documents and articles with you that have already been written:

      Sport Compact Car - August 2004 - What's Wrong with Your Dyno?

      Car and Driver - Is your Dyno Lying? - May 2004

      I have another one from this month's Hot Rod Magazine doing about the same thing with a Shelby GT500 Super Snake. I'll try to get it scanned in.

      I personally have had experience using:
      Dynapacks
      DynoJet 224s
      Dynojet 248s
      Dyno Dynamics
      Mustang MD-1100SE
      Land and Sea DynoMites

      I have done some paper-only research on
      MAHA LPS3000
      Superflow
      Rototest
      Dynamic Test Systems

      I'm nearly ready to complete my research and put it all into a nice written document for everyone to read.

    2. 03-14-2011 12:14 AM #2
      Very interested to see the end result. Very interested in this topic as well!


    3. Geriatric Member Chapel's Avatar
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      04-17-2011 11:10 PM #4
      One more dyno day before I finish

    4. Member Vegeta Gti's Avatar
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      05-21-2011 05:35 PM #5
      :HOMEGROWN MOTORSPORTS:1:4.9 SuaSponte #13Dead Rabbits. Ungluck on IG
      Quote Originally Posted by frechem View Post
      I like my women how I like my whiskey; aged 18 years and mixed up with coke.

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      03-22-2012 03:56 AM #6

    6. Geriatric Member Chapel's Avatar
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      03-22-2012 11:14 AM #7
      ah crap... right... need to finish this don't I?

    7. Member Aguilar's Avatar
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      03-22-2012 02:50 PM #8
      Yes please.

    8. Geriatric Member Chapel's Avatar
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      03-22-2012 04:08 PM #9
      Quote Originally Posted by Aguilar View Post
      Yes please.
      if anyone has any questions they'd like to ask, maybe it'll get me through my writer's block...

    9. Member 02vwgolf's Avatar
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      03-29-2012 10:02 AM #10
      Quote Originally Posted by Chapel View Post
      if anyone has any questions they'd like to ask, maybe it'll get me through my writer's block...
      Is there any truth behind the 12% estimate in power difference between Mustang dyno's and dyno-jets? I got dyno'd last summer on a mustang dyno, and after numbers lower then I was expecting I found online that there seems to be a trend of about 12% for identical cars on either type of dyno...

      If anyone knows the truth it sounds like you may be the one

    10. Geriatric Member Chapel's Avatar
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      05-03-2012 01:43 PM #11
      With my E30 BMW, I was seeing about 12% loss at the rear wheels on a DynoJet 248C and 224X. with the same car on a Mustang MD-1000 was an 18% loss (estimating approximately 170bhp)
      Weather conditions were similar
      This is obviously for a 2WD vehicle.

      I have NEVER used a 4WD intertial Dynojet unfortunately, so I can't say.

    11. 05-03-2012 01:49 PM #12
      Did you have the engine from this car on an engine dyno outside of the chassis?

    12. Geriatric Member Chapel's Avatar
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      05-03-2012 01:52 PM #13
      Quote Originally Posted by Dubmekanik View Post
      Did you have the engine from this car on an engine dyno outside of the chassis?
      I did not. It's the only thing I've not done.
      Though a good running E30 with some mileage with an exhaust should make about 170bhp (stock is 168bhp)

      Though we assume a base estimate of crank power (in this case 170) so that when we take those baselines to another dyno, we assume the same crank and work out the information on dyno loss.

    13. 05-03-2012 01:57 PM #14
      As you know, all engines are different. Estimated figures from manufactures are all over the map. Mileage makes a difference, too. Until someone takes an engine out and has it measured, then installs it back in the chassis and also has it measured that is the only way we can APPROACH the estimate of drivetrain loss. And then only for that particular year/make/model of vehicle..Then you would have to take an average of the top few different dyno companies, because there are differences there too. Thanks for your input, though! This thread's been dead for quite a while!

    14. Geriatric Member Chapel's Avatar
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      05-03-2012 01:59 PM #15
      Quote Originally Posted by Dubmekanik View Post
      As you know, all engines are different. Estimated figures from manufactures are all over the map. Mileage makes a difference, too. Until someone takes an engine out and has it measured, then installs it back in the chassis and also has it measured that is the only way we can APPROACH the estimate of drivetrain loss. And then only for that particular year/make/model of vehicle..Then you would have to take an average of the top few different dyno companies, because there are differences there too. Thanks for your input, though! This thread's been dead for quite a while!
      exactly, but setting a control number still makes sense. The EXACT losses are always going to be estimated for ALL dynos.
      when I say 12% for a dynojet and 18% for a Mustang... that's not ALWAYS the case. Weather conditions are important as well. Also, some dynos are calibrated differently as well.

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