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    VWVortex


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    Thread: Dyno talk - let's pull all the facts, and maybe even rumors about dyno differences to one place

    1. 10-19-2009 04:00 AM #26
      Telling the dyno what gear ratio you happen to be in is not going to change the measured tq. There is not even a correct way to calculate drivetrain loss accurately. We have the ability to enter the gear ratio, but this is only used to generate a tach signal on diesels, or cars that are a pain to get an accurate rpm pickup from the usual methods. I am only intimately familiar with the dyno we have, but I know it is not possible to calculate real-world hp/tq from whp by knowing the gear ratio of the transmission. It would be like saying "FWD drive cars have 10% drivetrain loss" which is not always true especially between different car manufactures. If there is in fact dyno software that will manipulate the measured tq. and correct it based on a ratio input from the operator, it would be at best a very rough estimate.


      Modified by Dubmekanik at 3:05 AM 10-19-2009
      Last edited by Dubmekanik; 06-14-2010 at 03:02 AM.

    2. Member chois's Avatar
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      10-19-2009 10:27 PM #27
      Right. Torque is measured, and the values won't change, they would just be assigned to the wrong engine speeds, and thus the HP values will change with gear ratio errors.
      edit - looks like I typed the wrong word a few posts up - meant to say hp not torque...


      Modified by chois at 7:29 PM 10-19-2009
      Chris
      2007 GTI 16v, 4 door, 6sp (well really that one is Brandy's)
      2004.5 Passat Wagon 20v, 1.8t, 4mo, 5sp
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    3. Junior Member
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      01-11-2011 06:47 PM #28
      im running a v9 stg1 s/c on a 2000 vr6

      do you have to get the ecu upgraded first before taking it to get tuned?

    4. Geriatric Member Chapel's Avatar
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      01-21-2011 05:48 PM #29
      I've been doing some hands on research of this for almost 10 years now
      I'm nearly ready to put it all together into one easy to access document
      http://forums.vwvortex.com/showthrea...from-2002-2011

    5. 06-22-2011 08:22 PM #30
      My car was run on a dyno before I bought it, the dyno showed the car was at 170WHP and about 185TQ after my stg.1 software my car was running 210WHP and 280TQ. I was wondering if this sounded right, it seems like it is since WHP is less than BHP.

    6. Junior Member RBPE's Avatar
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      12-02-2011 11:56 AM #31
      Can any dyno operators go into detail about how dyno's struggle with Haldex and other torque limiting factors in automatic transmissions, it annoys the hell out of a lot of R32T owners here that they can't get correct readings for their cars.

    7. 05-03-2012 12:44 PM #32
      Listen I just had a sh_t ton of work here and it was done damn right

      http://enhancedstreetperformance.com

      Dave the owner was great to work with also and does "Dyno Days"

      Check them out they do it all ~

    8. Geriatric Member Chapel's Avatar
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      05-03-2012 01:50 PM #33
      Quote Originally Posted by decade View Post
      Listen I just had a sh_t ton of work here and it was done damn right

      http://enhancedstreetperformance.com

      Dave the owner was great to work with also and does "Dyno Days"

      Check them out they do it all ~
      Dave's been my dyno man for the past 4 years. Great guy, great dyno days. Unlike other dynos, I don't need to make a big deposit and then collect the payments from the participants (who frequently no show)
      I'm able to book the day and he gets me staff and I get him people. I average 20-25 people in a day starting at 830am and ending around 430ish. They provide food and drink. The viewing area is immense, so there's little to no crowding. Lots of area to shoot video and photos

      I've also perfected the 'efficient dyno day' with him... I provided some spreadsheets for signup and running that has gotten us into a rhythm of about 1 car every 20-30 minutes. We do all the registration information up front (the day before). All cars are input into the system one day ahead of time so you just give the operator your name and you get on the dyno... no waiting around as they input your info.
      On top of that, we basically have a 'batters box' where you wait for the guy ahead of you to finish.

      It's all very common sense, but actually DOING it is a different story.

      Here's the last video
      http://www.youtube.com/watch?v=qkmXEAkNEHs&feature=plcp

      check out my channel for LOTS of dyno video
      http://www.youtube.com/user/NorthShoreInnovation

    9. Forum Sponsor Tom@APTuning's Avatar
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      05-03-2012 02:00 PM #34
      Quote Originally Posted by decade View Post
      Listen I just had a sh_t ton of work here and it was done damn right

      http://enhancedstreetperformance.com

      Dave the owner was great to work with also and does "Dyno Days"

      Check them out they do it all ~
      No sure if you have some affiliation with them but please refrain from posting that same stuff in my own Dyno day thread. Im not interested in someone advertising someone else's services in a thread for my shop's event

      Thanks
      APTuning LLC, 30 s 5th Ave, Lebanon PA 17042, (717)272-0916
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    10. 05-01-2014 04:33 PM #35
      Question:

      About 3 years ago I dyno'd my old setup on a dynojet. The operator asked us if we had USB sticks. If so he could give us the WinPep file for the run. I happened to have one. I took it home and opened it in WinPep. It allowed me to choose between the "smoothings" we often see and also to turn OFF the SAE correction method for the atmosphere that day.

      How did turning this on/off vary a full 25whp on a 370whp run? The temperature outside that day was a perfectly average 70 deg F and normal barometric pressure.

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