Dyno sheet? virtual dyno
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This is a discussion on Dyno sheet? virtual dyno within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; hi guys done a log today how accurate do use think this is? smoothing factor at 6, on board weight ...

  1. #1
    Registered User sxcrxy's Avatar
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    Dyno sheet? virtual dyno

    hi guys done a log today how accurate do use think this is?

    smoothing factor at 6, on board weight around 185- 200kg (400lbs) (thats 2 people inc driver and a bag of tools in the boot)

    ambient temp 17 degrees celcius
    boost creeps abit, top end richens up alot (maf needs some work)
    320whp?!?

    im happy about these results but how accurate do you think it is?
    Click image for larger version. 

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  3. #2
    and the Funky Bunch Calvinball's Avatar
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    Virtual Dyno?

    Not accurate at all haha. Sorry.
    - Will
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    Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
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    Moderator Donkey's Avatar
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    Notice that big dip in the middle? What gear did you use? I never go off one pull either. I use multiple and use the average.
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    Master Baiter EJ257's Avatar
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    It can be useful if the information is input correctly. Were you only logging RPM, TOA, PSI, and WBO2? Was "Fast Polling" on?

    Notice how it TQ/HP doesn't cross @ 5252 RPMs? That graph is useless.
    2005 WRX STi (Mods | Virtual Dyno)

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    Registered User bbarnhill's Avatar
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    Quote Originally Posted by Calvinball View Post
    Virtual Dyno?

    Not accurate at all haha. Sorry.
    Might want to do a comparison of your own before you knock it Its closer than you think buddy. Its been compared to a lot of DynoJets nationwide.

    I do agree that this graph isnt accurate because its showing two large humps in it even for smoothing of 6. I bet it is hiding two large spikes which are usually a result of crappy data from the logger. If you notice and manually analyze the data from an AccessPort in fast logging mode. Its complete garbage.

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    Registered User sxcrxy's Avatar
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    Quote Originally Posted by Donkey View Post
    Notice that big dip in the middle? What gear did you use? I never go off one pull either. I use multiple and use the average.
    i did a 3rd gear pull ive used other pulls aswell around 290 - 300 whp but this one is the highest ive ever gotten after i tweaked the map abit i loged the following

    engine load
    engine speed
    iam
    ignition total timing
    knock correction advance
    manifold relative pressure direct
    mass air flow g/s
    mass air flow voltage
    throttle opening
    feedback knock correction
    fine learning knock correction
    innovate wideband afr

    i had alot of parameters because i didnt do this pull for the dyno i was just checking up on the map i tweaked abit

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    OMG WTF MainFrame's Avatar
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    If that dip is indicative of your average pull, you need to work on your tune.

  9. #8
    Registered User sxcrxy's Avatar
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    Quote Originally Posted by MainFrame View Post
    If that dip is indicative of your average pull, you need to work on your tune.
    i just went over the log that dip is cause because of throttle opening position turns out i have backed off to 90% from 4300 to 4699, theres a floor mat that sometimes slips and get in the way, so thats why theres a dip

  10. #9
    OMG WTF MainFrame's Avatar
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    That doesn't sound safe at all..

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    Registered User sxcrxy's Avatar
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    lol :P it only affects wot sometimes otherthan that its okk

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    Registered User teflon_jones's Avatar
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    For now it only affects WOT sometimes. Anything that gets in the way of normal pedal movement is extremely dangerous. How do you know when it might get in the way of braking normally for the first time and what situation you'll be in? RIP in that case...

    I'd say that graph is pretty useless. Maybe it's somewhat accurate, maybe it's not, but in reality you need a real dyno run to get any useful information.
    Scott
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  13. #12
    and the Funky Bunch Calvinball's Avatar
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    Quote Originally Posted by bbarnhill View Post
    Might want to do a comparison of your own before you knock it Its closer than you think buddy. Its been compared to a lot of DynoJets nationwide.
    For where I was going with my comment, see below.

    Quote Originally Posted by teflon_jones View Post
    Maybe it's somewhat accurate, maybe it's not, but in reality you need a real dyno run to get any useful information.
    But for what it's worth, I've also read a number of anecdotes about getting inconsistent results with virtual dyno. But what I really meant was it is absolutely no replacement for a real dyno. Sorry I wasn't clear.
    - Will
    First Mods: What to do and what not to do
    Current Car: 2014 Golf TDI
    Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
    "Isn't it amazing how smart you feel when you just aren't being stupid?"

  14. #13
    Registered User bbarnhill's Avatar
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    Quote Originally Posted by Calvinball View Post
    For where I was going with my comment, see below.



    But for what it's worth, I've also read a number of anecdotes about getting inconsistent results with virtual dyno. But what I really meant was it is absolutely no replacement for a real dyno. Sorry I wasn't clear.
    There are nay sayers in every group. Virtual Dyno only reflects readings that the logger records. If the user is not aware that hills and taking a log while on an interstate on ramp is a bad idea. I cant code for those scenarios. User error accounts for a lot of the 'bug reports'. I will agree that most dynos are a better way to get information. I will preface this with the fact of it only being true if the dyno operator isnt a complete moron. Ive seen them lead people into thinking they were making power that they werent.

    Now as far as a tuning tool there are SEVERAL people using this for what its meant for which is showing power before and after mods. That is what a dyno is for actually. The community consistently misuses dynos and virtual dyno by thinking they are to compare cars on peak power. Now I could go on and on about misuse and things Ive seen done but that isnt going to change your mind. I will leave you with this though. Who wants to drop 70$ on 3 pulls when you can get Virtual Dyno for free and make a few passes and tune and then get the final numbers from one dyno session instead of 2-3 sessions. Virtual Dyno saves you money in the long run and saves a lot of people from having to drive hours to the nearest dyno. So I wouldnt write it off yet.

    One thing that baffles me is why is the subaru market the only market that whines about a free tool that has been proven to be pretty darn accurate and its FREE!!

  15. #14
    Registered User bbarnhill's Avatar
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    Also if you notice he is using newton meters of torque instead of foot pounds which will not cross at 5252 ... just noticed this based on the comment above.

  16. #15
    Moderator Donkey's Avatar
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    Quote Originally Posted by sxcrxy View Post
    i did a 3rd gear pull ive used other pulls aswell around 290 - 300 whp but this one is the highest ive ever gotten after i tweaked the map abit i loged the following

    engine load
    engine speed
    iam
    ignition total timing
    knock correction advance
    manifold relative pressure direct
    mass air flow g/s
    mass air flow voltage
    throttle opening
    feedback knock correction
    fine learning knock correction
    innovate wideband afr

    i had alot of parameters because i didnt do this pull for the dyno i was just checking up on the map i tweaked abit
    Like Matthew said (EJ257), horsepower and torque never cross. The information or dyno graph is just plain bad.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




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