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"Dyno Butt" test with VAG-COM on S3's

Discussion in 'A3/S3 Forum (8L Chassis)' started by pure, Aug 27, 2004.

  1. pure
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    pure Member

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    [Aug 27, 2004]
    Hmmm, not sure about how accurate this dyno test is using vag-com. But according to the tests measuring block 005 and 120. I am producing 333.8 (Nm) Net Torque, and 248 bhp at the wheel, with 221Lb-ft torque at the wheel.

    The Bhp figure doesn't sound right to me. I't was done using the weight of the car as 3355lb. (1525kg)

    I am running 21psi of boost, which thanks to my MBC is sustained for a lot longer than average.

    Does any1 else have vag-com and a chipped S3 they could do similar comparison.

    I've attached a plot of my actual boost vs requested boost for any1 that is interested also.

    Cheers

    Greg

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  2. Drill
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    Drill Member

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    [Aug 27, 2004]
    Hmm, your Torque sounds a bit low too dude /ubbthreads/images/graemlins/confused.gif My A3 was dyno'd at 329 Nm after re-map. I would have thought the S3 gap would be more /ubbthreads/images/graemlins/crazy.gif

    /ubbthreads/images/graemlins/beerchug.gif
    #2
  3. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Aug 27, 2004]
    Remember this is vag-com guesstimate!

    Rich
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  4. robthehungrymonkey
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    robthehungrymonkey Member

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    [Aug 27, 2004]
    Doesn't an S3 weigh 1375kg? Could be wrong.
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  5. pure
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    pure Member

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    [Aug 27, 2004]
    Im going to get some better logs, the road I was doing the tests on wasn't completely flat, and very twisty :-/

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  6. AL_B
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    AL_B Active Member

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    [Aug 27, 2004]
    [ QUOTE ]
    Robthehungrymonkey said:
    Doesn't an S3 weigh 1375kg? Could be wrong.

    [/ QUOTE ]

    The pre-facelift models quoted weight is 1375kg.
    The facelift models weigh a little bit more, about 1460kg.

    See this post...

    S3 Weight

    AL
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  7. pure
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    pure Member

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    [Aug 27, 2004]
    Yeah, so the weight I used was about right considering there were 2 of us in the car too.
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  8. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Aug 27, 2004]
    S3's are right lard arses! My A3 weighs 1246kg. Will be removing the spare wheel, rear seats and sub .etc for the upcoming trackday... should be pretty bloody rapid with 300lb/ft /ubbthreads/images/graemlins/grin.gif

    VAG-COM wont be to accurate anyway... Probably doesnt account for transmission losses .etc at the wheels.

    Rich
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  9. AL_B
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    AL_B Active Member

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    [Aug 27, 2004]
    [ QUOTE ]
    RichA3Turbo said:
    S3's are right lard arses!

    [/ QUOTE ]

    Yep, fat as fook! /ubbthreads/images/graemlins/smile.gif


    AL
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  10. pure
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    pure Member

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    [Aug 27, 2004]
    The VAG-COM dyno is supposed to be pretty accurate, on some other forums, they compared vag-com results with actual dyno results and they were accurate within a couple of BHP.
    #10
  11. AndybS3
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    AndybS3 Member

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    [Aug 27, 2004]
    Wouldn't the coast down part of the butt dyno account for transmission losses?

    I think I've read somewhere that the ecu or Vag-Com can only read upto just over 1.5bar is this correct?
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  12. pure
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    pure Member

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    [Aug 27, 2004]
    The coast bit is supposed to do the "drag" part of the equations.

    Not sure about max boost readings on vag-com.
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  13. DuncS3
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    DuncS3 Member

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    [Aug 27, 2004]
    1.5 bar is the maximum (or maybe 1.55)

    Dunc
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  14. pure
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    pure Member

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    [Aug 27, 2004]
    Ok, off and on it has taken me all day to get some figures from the data I logged last night, I'm still learning vag-com, but this is a dyno plot of the at the wheel power figures of my S3.

    I have no where near enough info logged, so will be redoing it this weekend and need to tweak the vag-com to log faster than it does currently.

    ANyway....I'll shut up....what do you think of this dyno? does it look right considering the data that I have collected?



    #14

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