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  1. #1
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    Before calling BS on dynos...

    Over the last few weeks I've seen a number of posts expressing skepticism over various SC dynos. Two recent examples:

    Person A dynos their stage 1 SC and makes 500rwhp
    Person B dynos their stage 2 SC and makes 520rwhp

    People claim person A's dynos must be wrong (too high)


    Person C dynos their stage 2 SC and makes 460rwhp
    Person D dynos their stage 2++ SC and makes 600rwhp

    People claim person D's dynos must be wrong (too high)



    At face value, those claims might seem reasonable (although one might ask why they don't suspect B & C of dynoing "too low"). But there is A LOT more variance in dynos than most people realize. PG was kind enough to open his dynodb to me and using only stock vehicles here's what I discovered:

    Stock dynos ranged from 303 to 363 rwhp. Those weren't just single outliers either: there were 3 over 360 and 2 under 305. Even just amongst the dynojet runs, results varied by over 40 horsepower. Stock! So arguing simply because a dyno is 20-40hp away from expected on a modded car is just silly (not saying you shouldn't question results, but chill with the accusations until proven).


    Other interesting tidbits:

    Average stock dyno: 334rwhp

    Broken down by:
    6MT: 339rwhp (18% drivetrain loss)
    DCT: 326rwhp (21% drivetrain loss)
    E92: 338rwhp
    E90: 330rwhp
    91oct: 331rwhp
    93oct: 337rwhp
    Last edited by spdu4ea; 04-02-2010 at 05:56 AM.

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    More importantly, remember that dynos are simply tuning tools, and the only numbers that really matter are the ones realized when changes are made to the car or tune. The end number is really only relative to the adjustments made.

    Dyno Dick Measuring (DDM) is pointless anyhow, since, as pointed out above, two of the same cars can make different power in stock trim, and, there are multiple varieties of dyno that all read differently - some lower, some higher.
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    Absouletly, this is why 60-130's and timeslips should be used in concert with the dyno's to give a complete picture.

    However, there were some accusations of specific dyno manipulation on a specific dyno regarding specific boost levels on a specific octane of gas. We won't get into it again, but the questions about that dyno still remain and do not allign with other dynos at similar boost levels. There will not be an 80 whp range at the same boost level on the same type of dyno, not possible.

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    Very well said brotha!

    If you take the ~25rwhp Drew would gain from going catless and the extra 3% drivetrain loss from his DCT, he would be around 560rwhp.

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    I wish more people could understand facts like this...

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    Click here to enlarge Originally Posted by niterider Click here to enlarge
    I wish more people could understand facts like this...
    How was Mfest man? Heard you dominated the track event, congrats!

  7. #7
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Absouletly, this is why 60-130's and timeslips should be used in concert with the dyno's to give a complete picture.

    However, there were some accusations of specific dyno manipulation on a specific dyno regarding specific boost levels on a specific octane of gas. We won't get into it again, but the questions about that dyno still remain and do not allign with other dynos at similar boost levels. There will not be an 80 whp range at the same boost level on the same type of dyno, not possible.
    Agreed,


    Dyno numbers are just numbers which mean nothing w/o proof.
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