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Discussion Starter #1 (Edited)
Virtual Dyno and Data-logging

Want to see how much power your car is making, but can't afford or find the time for a dyno? Need to log AFR, Boost, Timing, and more? This is the solution. Proven time and time again to be within 3-5% accurate when compared to Dynojet dynamometers, Virtual Dyno can be a great tool for comparing with others or revealing power issues.

All of the tools needed are completely free, except for the OBD2 adapter. You can find those on ebay/amazon for around $10-25, which is peanuts compared to a single dyno test!

This should be a fully comprehensive guide to setting up, taking logs, and graphing them to be saved for future use.

First thing you need is a smartphone of the Android or iPhone variety. Sorry, windows phone does not have an app for logging.
Download an app called Torque for Android. If you have an iPhone and know how to take logs please post it so that I can incorporate it into the guide.

Once you have the Torque app installed, there is two ways to set it up. One for Lite and one for Pro.

Setting up Torque Lite
Torque Lite will give you the minimum parameters you need to log in order to make a Virtual Dynograph. You are not able to log Boost or AFR in Torque Lite. It has an option for Boost, but the values it gives are incorrect. Also, one of the limitations of using Torque Lite is that it does not save your PIDs for logging. So each time you start the Torque Lite app you have to re-add all the PIDs again.

Settings.jpg Torque_Lite_Units.jpg Torque_Lite_Adapter.jpg Torque_Lite_Connection.jpg Torque_Lite_Loggin_Prefs.jpg Torque_Lite_Interval.jpg
Torque_Lite_PIDs.jpg Torque_Lite_Add_PID.jpg Torque_Lite_RPM_Throttle.jpg Torque_Lite_Boost.jpg
 

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Discussion Starter #2 (Edited)
Now you can actually start logging.

Torque_Lite_Toggle.jpg Torque_Lite_Enabled.jpg

When you're done, press the same button again to stop the log.

Torque_Lite_Disabled.jpg

Torque Lite does not separate the log files between each new log, so you'll have to either manually edit the spreadsheet yourself or clear logs after each log.

You can transfer the logs to Google Drive or your own e-mail. Always choose CSV, it's the only format supported by Virtual Dyno.

Torque_Lite_CSV.jpg

Setting up Torque Pro
Paying the $4.99 asking price gets you a lot of extra goodies and saves you some hassle with a better dash, extra settings/PIDs, USB cable support, and more! Much of the setup is the same, however, there are slight differences that need explaining.

Torque_Pro_Settings.jpg Torque_Pro_Units.jpg Torque_Pro_Units2.jpg Torque_Pro_Adapter.jpg Torque_Pro_BT.jpg Torque_Pro_OBD.jpg
 

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Discussion Starter #3 (Edited)
Torque_Pro_Logging.jpg Torque_Pro_LogFormat.jpg Torque_Pro_PIDs.jpg

Now when you want to start the log, just press the cog wheel and 'Start Logging'.
Torque_Pro_Toggles.jpg Torque_Pro_Disable.jpg

You can transfer the logs using the 'Email Logs' button, make sure to select CSV.

Setting Up Virtual Dyno
Download virtual dyno from www.virtualdyno.net and install it. You must have Windows XP or above. Sorry Mac users.

First you have to make a vehicle profile so that Virtual Dyno can properly calculate torque and power.
VDyno_CarEditor.jpg

If you have a manual, make sure to use these specifications. If you happened to weigh your car at a truck scale or using corner scales, then use that.
VDyno_ManualVeloster.jpg

Auto's, you can use these.
VDyno_AutoVeloster.jpg

Make sure you click 'Save as Custom' when you finish. Don't change the directory it defaults to, but name it whatever you want.

Now you need to change some of the preferences, make sure yours look like these images.
VDyno_Graph.jpg
 

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Discussion Starter #4 (Edited)
You can set the Correction Factor to whatever you want, just make sure that you always use it when comparing to other runs. This is the only way you can compare mods. I recommend Virtual Dyno, it seems to be the closest to reality. I'm sure once more people make graphs we will find out what the perfect Correction Factor will be.
VDyno_Dyno.jpg
*I'm now using a custom Correction Factor of CF1.01.

VDyno_Columns.jpg

You no longer have to mess with the CSV files! However, if you have multiple runs in the same CSV file it will load all of them up at the same time. I prefer to keep my runs separated, but that's just me.
 

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Discussion Starter #5 (Edited)
Opening & Graphing Logs
After opening a log there are a few ways you can tweak the correction factor, smoothing, and more.

VDyno_loadRuns.jpg

VDyno_Car.jpg

It's important that you double check the selected Gear, if the graph looks wrong this is a good place to check.
VDyno_Gear.jpg

Add the total weight of yourself and anything else inside of the car. You can include fuel if you want. Just make sure you let others know when posting the graphs.
VDyno_Weight.jpg

SAE correction allows you to correct for different temperature and barometric pressure. You can find this on wunderground.com.
VDyno_SAE.jpg


It's very important that you take as many runs as you can and compare them. If you get a lot of torque then you are likely on a road that is on a decline. Keep trying different roads until you find the one that allows you to take repeatable results.
VDyno_badRun.jpg

You should load up multiple runs at the same time so you can compare them and figure out which is the most accurate.
VDyno_compareRuns.jpg

Since all three runs have similar curves after 4000 RPM, we can assume that the road itself is the problem and not the correction factors. Another way to know if the road is the problem is if adding more smoothing results in a difference greater than 15WHP/TQ. That is a sign of bumps in the road or a road that isn't flat.
VDyno_compareGraphs.jpg

That's it! It will take some trial and error, but eventually we will get to a point where we can find out if a mod adds power and where.
 

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Discussion Starter #6 (Edited)
Ah-HA! I figured out why the torque is so high in the beginning!

This program is looking for Cobb Accessport time stamps, which counts time cumulatively. Torque counts time as in the current time on the device. So all I did was convert all the time stamps with the equivalent times the program expects and now it is reading much better!

Comparison to show you
VDyno_TimeStamps.jpg


Convert This
Torque_Time.jpg

To This
Cumulative_Time.jpg

I think what happens is that the program calculates torque based on the time it takes to reach an RPM. So it needs to see time in this way, otherwise it isn't able to properly do the math.
 

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Discussion Starter #8
Yeah as we discover more about this program we can tweak it. The high torque was the biggest issue, but now it seems like it is pretty close to an actual dyno.
 

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This is a sweet program, it's pretty accurate after you set it up right. Used it in my ms3 days after taking ap logs after a tune.
 

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We use VD in EVO land as well. Dead accurate once set up properly. I have been using it for quite a few years now

As you said you'll want to find the flattest road possible and make multiple runs to overlay

Another great post. Nice to see good info getting to the community here instead of the usual "This Oil Is The Best Thread"
 

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Snail, snail, snail.. bro, exceeeeelllllleeeeennntttttt write up! Pretty sure this could be titled as Virtual Dynoing for Dummies! HAHA! I'm def going to have to try this sometime tonight or this weekend as I'm very curious to see the actual curve difference with installing the Tork pipe this weekend too! I will be trying to do logs with stock intake on and with my DIY intake too. Just gotta get the time in my schedule, not to mention we're currently in rain right now and are expecting torrential downpours tomorrow. Great job and thanks for doing it for us!
 

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Can't wait to see your results with the Tork pipe because I just installed mine last weekend and I can't wait to go home and try this as well! Thanks Snail!
 

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Can't wait to see your results with the Tork pipe because I just installed mine last weekend and I can't wait to go home and try this as well! Thanks Snail!
I'm just curious if there is actual any loss like claimed on the low end and what gains are to be had on the high end. Fortunately for me, I have a mile long access ramp that runs right next to a road where there's about 3 miles of burn out tracks where it's flat surface of nothing but runs happening lol! This was years ago, but now there's a trailer park there and no one ever goes down it. So, my results should be pretty consistent! We shall see!

Snail, is there the option to factor in other logging measures, such as IAT's into the graphing so that you may see how the car reacts under different intake temps?
 

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Discussion Starter #15
Yea, use SAE if you want to see how temperature would effect the car. However, because our car is turbocharged, you can probably add a few extra HP/tq since we rely on cold temps more than naturally aspirated cars.

I feel like uncorrected may be simpler though. When it asks for barometric pressure, it wants the pressure that the ECU sees. If you log the Barometric Pressure PID, then you will know what it is.
 

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Ahhh, ok. Well, i'm going to have lots of questions this weekend.. so bare with me!
 

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Discussion Starter #17
Most of the work is just setting up the apps. After that its fairly straightforward. We need someone who recently dyno'd to take some logs that way we will know what we need to use to make it more accurate.
 

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Most of the work is just setting up the apps. After that its fairly straightforward. We need someone who recently dyno'd to take some logs that way we will know what we need to use to make it more accurate.
Wonder if Nox or Zex have the app, being that there the most 2 recent tunes that I know of with dynos...
 
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