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Thread: Dyno Tricks To Be Aware Of

  1. #1
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    Dyno Tricks To Be Aware Of

    Having spent time on the dyno in Georgia, PA, Virginia, and NJ. I have always wanted to know why they differ so widely. Below are some of the answers. Some of you have had similar experiences.

    The Story Behind the Dynojet Chassis Dyno. This is a excellent read if you have the time.
    http://hotrod.automotive.com/23395/1...yno/index.html

    Beat the Drum
    The crooked dyno operator can reprogram the weight of the drum, which will allow the dyno to create anomalous power numbers.

    The High Ground
    The same crooked dyno operator could elect to change the elevation value in the computer, which would have a critical impact in power generation. Naturally aspirated engines are especially susceptible to this ploy.

    Change Load
    Changing the load by tightening or loosening the tie-down between runs can compromise any comparisons made with the dyno testing.

    Different Day Dynoing
    This one can be hard to avoid if you are having extensive work done. Check to see if the dyno in question has a weather station that can correct for any big differences. Beyond that try to arrange testing for about the same time of day as baseline runs were performed. This will lessen the effect.

    Correction Factor
    A key element to producing comparable dyno charts on a global basis is the Correction Factor, SAE Standard J1349, which applies the following weather station data--atmospheric pressure 29.23, air temperature 77 degrees Fahrenheit and humidity 0 percent--to all tests. These exact figures allow apples-to-apples comparison of runs from different cars, different facilities, etc. So graphs with SAE-corrected power were made to this standard. The dyno in question must have a weather station and the proper software in order to generate SAE-corrected data.

    Smoothing
    An option on Dynojets, smoothing takes a jagged graph and delivers a more readable curve. Smoothing of the graph can be done by entering a value between one and four at the appropriate place in the computer.

    Alignment
    The alignment of the vehicle being tested does affect the outcome of a dyno test. So if a car is dyno'd, then run over a curb, thus altering the toe or camber, the car may not have repeatable runs. This is especially true on Dynojets.
    Last edited by merc; 04-30-2009 at 10:18 AM.


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  2. #2
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    That's why it's always best to use the same dyno to compare.

    Good info Merc!
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  3. #3
    Good info Merc, thanks.

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    The KING of BLING!


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    Quote Originally Posted by GOT5.0 View Post
    Be forewarned dont run the one that says DOOM. cause thats just what youll get!
    Quote Originally Posted by TAKEDOWN View Post
    It's easy to find D00M, just follow his smoke or his trail of trophies!
    Quote Originally Posted by MMBLUE View Post
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  5. #5
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    Quote Originally Posted by O's Fan Rich View Post
    That's why it's always best to use the same dyno to compare.

    Good info Merc!
    Check this out Rich. I have personally seen lazy operators not change the value of the weight or ask.

    http://forums.corvetteforum.com/perf...tang-dyno.html

    One of a perf. shops little tricks, change the vehicle weight input, even by a hundred pounds will skew the numbers quite a bit to show the part they just sold you did something for HP.

    I dont have a problem w/ either one, they are both industry leaders(I just happen to prefer DJ) The main problem is inept or corrupt operators. If you go on a Load Control Dyno, your car better be weighed, with the person in it doing the testing. Go over all the parameters with the operator to make sure you are getting what you paid for.


    James Brown #140 "Say It Loud" Except in Bristol
    Merc's Garage
    MagnaFuel ProTuner Series 750 MP-1403
    Stainless Steel Works full exhaust
    SCT Advantage III Ford Pro Racer Software
    600.59 rwhp 559.91 Torque @ 20 lbs Boost
    2.3 Whipple Intercooled Supercharger
    BC Automotive Stage4 transmission
    03 Terminator built by Chris Vining

  6. #6
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    This is a old tread but unearths some old conversations we had back in 2003.

    http://www.mercurymarauder.net/forum...t=dyno+numbers


    James Brown #140 "Say It Loud" Except in Bristol
    Merc's Garage
    MagnaFuel ProTuner Series 750 MP-1403
    Stainless Steel Works full exhaust
    SCT Advantage III Ford Pro Racer Software
    600.59 rwhp 559.91 Torque @ 20 lbs Boost
    2.3 Whipple Intercooled Supercharger
    BC Automotive Stage4 transmission
    03 Terminator built by Chris Vining

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    Tire pressure will affect results. Ask me how I know, go ahead I dare you!
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    Merc do you know of someone or someplace that does these dyno tricks?
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  9. #9
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    Question

    Quote Originally Posted by Haggis View Post
    Tire pressure will affect results. Ask me how I know, go ahead I dare you!
    How do you know haggis?

    The KING of BLING!


    BOOST GETS YOU IMPERSONATED!

    Quote Originally Posted by GOT5.0 View Post
    Be forewarned dont run the one that says DOOM. cause thats just what youll get!
    Quote Originally Posted by TAKEDOWN View Post
    It's easy to find D00M, just follow his smoke or his trail of trophies!
    Quote Originally Posted by MMBLUE View Post
    When your good nobody likes ya, everyones jealous.

  10. #10
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    Quote Originally Posted by DTRMiguel View Post
    Merc do you know of someone or someplace that does these dyno tricks?
    Maybe Lidio or DR???

    The KING of BLING!


    BOOST GETS YOU IMPERSONATED!

    Quote Originally Posted by GOT5.0 View Post
    Be forewarned dont run the one that says DOOM. cause thats just what youll get!
    Quote Originally Posted by TAKEDOWN View Post
    It's easy to find D00M, just follow his smoke or his trail of trophies!
    Quote Originally Posted by MMBLUE View Post
    When your good nobody likes ya, everyones jealous.

  11. #11
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    Quote Originally Posted by DOOM View Post
    Maybe Lidio or DR???
    2004 DTR Mercury Marauder
    Build date:8/18/03
    Delivery date:8/14/08
    #21 of #983 DTR's
    #51 of #3213 in 04'

    And im not spanish my friends just say i look it the names "Michael"
    Quote Originally Posted by DTRMiguel View Post
    Fat people dont get kidnapped
    Zack Tune
    JLT DTR Cold Air Intake
    1/4 Mile ET 14.202
    1/4 Mile MPH 99.13



  12. #12
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    Quote Originally Posted by DOOM View Post
    Maybe Lidio or DR???
    It's not public information. The information I posted is cautionary in nature and not directed toward anyone person or vendor.
    Last edited by merc; 05-01-2009 at 08:06 AM.


    James Brown #140 "Say It Loud" Except in Bristol
    Merc's Garage
    MagnaFuel ProTuner Series 750 MP-1403
    Stainless Steel Works full exhaust
    SCT Advantage III Ford Pro Racer Software
    600.59 rwhp 559.91 Torque @ 20 lbs Boost
    2.3 Whipple Intercooled Supercharger
    BC Automotive Stage4 transmission
    03 Terminator built by Chris Vining

  13. #13
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    I heard them folks at SPRINGFIELD MOTORSPORTS can be pretty shady too!!!

    BEWARE.

    The KING of BLING!


    BOOST GETS YOU IMPERSONATED!

    Quote Originally Posted by GOT5.0 View Post
    Be forewarned dont run the one that says DOOM. cause thats just what youll get!
    Quote Originally Posted by TAKEDOWN View Post
    It's easy to find D00M, just follow his smoke or his trail of trophies!
    Quote Originally Posted by MMBLUE View Post
    When your good nobody likes ya, everyones jealous.

  14. #14
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    Quote Originally Posted by merc View Post
    It's not public information. The information I posted is cautionary in nature and not directed and anyone person or vendor.
    Are you tryna tell us springfield rigged your numbers?
    2004 DTR Mercury Marauder
    Build date:8/18/03
    Delivery date:8/14/08
    #21 of #983 DTR's
    #51 of #3213 in 04'

    And im not spanish my friends just say i look it the names "Michael"
    Quote Originally Posted by DTRMiguel View Post
    Fat people dont get kidnapped
    Zack Tune
    JLT DTR Cold Air Intake
    1/4 Mile ET 14.202
    1/4 Mile MPH 99.13



  15. #15
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    You hear a lot of things these days. I knew it would take long to see you both in this thread.
    Last edited by merc; 04-30-2009 at 11:48 AM.


    James Brown #140 "Say It Loud" Except in Bristol
    Merc's Garage
    MagnaFuel ProTuner Series 750 MP-1403
    Stainless Steel Works full exhaust
    SCT Advantage III Ford Pro Racer Software
    600.59 rwhp 559.91 Torque @ 20 lbs Boost
    2.3 Whipple Intercooled Supercharger
    BC Automotive Stage4 transmission
    03 Terminator built by Chris Vining

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