Virtual Dyno
 

Not sure if anyone has seen this before but thought it was pretty cool so figured i'd share.
I'm still kind of playing with it to see what settings work best but so far this doesn't seem too far out.
Would be interesting to see those of you with dyno graphs compare to what this spits out.

I have an old dyno graph when I was on 93 which made 564hp/529tq.
However, this was before I ever weighed my truck so the dyno operator put my truck about 6-700 lbs lighter in his settings than it actually is.
That and we were having issues getting rpm to match up. They think it was due to wheel spin so never really did get an accurate graph.

Now I know you can make this thing spit out whatever numbers you want based on the inputted info.
Regardless seems like a pretty fun way to compare some modification results such as below.
Here's the site to download the software if you want to check it out-->> https://barnhill.bitbucket.io/
He also has a mobile app which I just downloaded but have yet to use.
https://cimg0.ibsrv.net/gimg/www.f15...b4d4931434.jpg


Here are the coefficients I used to set up my profile. (ymmv)
Notice it's limited to 6 gears. I'm pretty sure as long as I stay within those gears it should be fine.
Let me know if you see something crazy off so I can make corrections.
https://cimg5.ibsrv.net/gimg/www.f15...565f36da8b.png

And here's some transmission info for those who do not have it.
https://cimg1.ibsrv.net/gimg/www.f15...49c5fc40c5.jpg

All you need is a .csv file from a datalog similar to how you would run on a dyno (i.e. 2k-7.5k rpm in 1:1 gear). I did 4th due to speed.
I use HP Tuners so I had to export the log file from .hpl to .csv to get it to work. You can do this in VCM Scanner.
Go to Log File>Export Log File>Click "Comma Separated Text .csv" and "visible range" if you're zoomed into your pull.
Entire Log works too as long as you don't have multiple pulls.

Please be sure to share your graphs and settings if you try it out!

Messed around with this a bit more. I think I got boost and afr to work. Had to make a few calculations in the .csv file.
Wish I could make it read lambda instead.

Also found an old log on the stock whipple tune up to 5.2k rpm. Thought i'd toss it in for s&g's.
Note that the stock whipple tune (green line) also had stock headers/cats/exhaust.
The tuned runs (red and blue) were both with Kooks headers/green cats/full 3" exhaust.
I point that out because boost psi has dropped with said modifications.
https://cimg1.ibsrv.net/gimg/www.f15...ac3f8f65fc.jpg

I'll mess with this later in the week. I have multiple dyno sheets to kinda compare to this.

I'm receiving an error that states "Missing Throttle Position" when I try to load a file.

The software uses some kind of logic to know what tuning device the log is coming from so it should be able to detect the common PID names.
If it doesn't automatically detect it you can force it to use a certain PID.
Try opening up your .csv file and see what your TPS parameter is named as. Then go into Virtual Dyno>File>Options>Columns and Profiles
Type in the name of that parameter into the box. (i.e. I did it below for Boost)
https://cimg7.ibsrv.net/gimg/www.f15...82fc82bb42.png

Another thing you can do is to rename the parameter in the .csv file itself which is what I ended up doing to get AFR to read correctly.
It automatically converted lambda into AFR for gasoline stoich so I had to back calculate it by multiplying lambda * 9.765 to get E85 AFR.
I guess it may be better to just leave it as is. The graph is mostly just good for the trend lines.

Thanks a lot. That worked but it's showing like 2,000 hp lol

Sounds about right. lol jk
It's likely your profile settings of the truck. All those numbers are multipliers in the calculation so can skew the numbers quite a bit.

Try using a 0.36 drag coefficient and 31.5 frontal area.
Here's what I used to get those values. Vehicle Coefficients
Obviously our truck is not listed so I used my best guess based on a similar vehicle.
If you know your truck weight then input that. If not use your best guess. There's a few ways to determine this.
Make sure the correct gear is selected on your opened run.

If your still having issues send me a pm and we can try to figure it out.

I've used virtual dyno for like 8 years lol. Nice you found it, you can actually just use the torque the ecu says you're making and get within 3-5% of actual power

Yeah idk how i've never heard of it before lol. I've heard of several others but not this one.

I know you can make some math parameters in HP Tuners to calculate horsepower. RPM * Engine Torque / 5252
I just like how this thing spits out an actual dyno graph.

No i mean these are torque based ecu's. The PCM AND the TCM know exactly how much torque is being made specifically in order to know how it needs to shift the transmission and to target power levels based on throttle position.

The PID : "engine brake torque" is extremely close to actual power. I know it says engine brake torque but ironically it's basically actual wheel torque.