[harkes]

Hi

Has anyone else in here played around with VirtualDyno? I just tried to compare a run on the road with a dyno run - both @ 16psi. VirtualDyno is matching the dyno result within a few hp and 50rpm - I am pretty impressed!

Will definitely play around with this some more

Yes yes yes, this is not very scientific, but for comparing modifications on your own car its pretty good I would say.

[Mike@N54Tuning.com]

As with any tuning tool, you are looking at changes (delta) Absolute numbers aren't that important. So if you do before and after a modification you should get a general idea of gains even with the virtual dyno.

Mike

[copperman05]

Hi Harkes,

Funny you posted this ia I've just been making the same comparison with an other dyno app PerfExpert.

I also just got my car dyno'd as you saw over on N54tech.com, the result are pretty similar too.

PerfExpert Showing wheel HP (this can be changed to crank hp in app) at crank translates to about 420hp


Dyno Dymamics showing HP at the crank

[mike@x-ph.com]

Just make sure that you always use the same road for the virtual dyno and you do not lose traction at all.

[harkes]

copperman05
I also have PerfExpert but find it less reliable than logging with JB4 and then using VD. PerfExpert is relying on the acceleration sensor in your mobile where as VD...well no need to explain further.

[copperman05]

Harkes, just used the VD and well its was pretty damn close.

Virtual Dyno 427hp and 489lbft (crank hp) accounting for 17.5% drivetrain loss which is about right for the M135i

Dyno Dynamics was 428hp and 481lbft can't ask for much more than that!

[Earthmaster]

Hmm doesn't work quite well for f30 cars as they are too new apparently. Doesn't include statistics on it. The 8 spd auto need a separate configuration.

[harkes]

Here is my configuration

[harkes]

Originally Posted by copperman05

Harkes, just used the VD and well its was pretty damn close.

Virtual Dyno 427hp and 489lbft (crank hp) accounting for 17.5% drivetrain loss which is about right for the M135i

Dyno Dynamics was 428hp and 481lbft can't ask for much more than that!

No need to spend any more money on dyno's now

[Earthmaster]

Originally Posted by harkes

No need to spend any more money on dyno's now

Does VD show WHP or Crank? Because I'm getting numbers that are more inline with Crank then WHP for my car.

[mike@x-ph.com]

Originally Posted by Earthmaster

Does VD show WHP or Crank? Because I'm getting numbers that are more inline with Crank then WHP for my car.

From my experience, it does not show either. VD is helpful to compare delta, do not count on it to give you accurate HP numbers.

[harkes]

I "calibrated" my setup to show crank hp. You can do whatever you want. There is a "dyno factor" you can change if you want to deduct those ~15% drivetrain loss.

[copperman05]

Harkes, Good tip to calibrate, under air temp are you entering ambient or intake temps?

[harkes]

Originally Posted by copperman05

Harkes, Good tip to calibrate, under air temp are you entering ambient or intake temps?

That must be ambient temp. Your intake temp will vary over the course of a pull as the IC heatsoaks and the turbo works increasing inefficient.

You can chose your own ambient temp. 25°C vs 35°C is a power los of 2%.

[Earthmaster]

Originally Posted by harkes

That must be ambient temp. Your intake temp will vary over the course of a pull as the IC heatsoaks and the turbo works increasing inefficient.

You can chose your own ambient temp. 25°C vs 35°C is a power los of 2%.

How do you calibrate it to show crank?

[copperman05]

Originally Posted by Earthmaster

How do you calibrate it to show crank?

Select options in 'file' and the dyno tab, under 'Dyno Correction Factor' you select custom, and enter in the required data.

1.00 is calibrated as VD

I wanted to add 17.5% drivetrain loss so entered 1.175 in the custom field.

for 15% is would be 1.150, etc.

[harkes]

I am using 1.00 to match my dyno run with my street run. With 1.00 I also get 328 crank hp on stock ECU so this is spot on I would say.
If I wanted WHP instead I would use a factor of 0.85.

[copperman05]

Harkes, do you know of anyway to edit the .csv files? I have the Dyno Dynamics dyno run logged on my JB4 but there is other data in the log that interferes with the VD results.

[copperman05]

No worries, I answered my own question. You use something like CSVed

[FSociety]

mge92 Crashnbrn5 TShoot K320 time to play shivaswrath

[shivaswrath]

Originally Posted by ROBNYC

mge92 Crashnbrn5 TShoot K320 time to play shivaswrath

Hell yeah!
At least we didn't get hit by a hurricane

[harkes]

copperman05
You will get a weird result using the dyno .csv in VD. Obviously because its two very different "worlds"
What you should do to calibrate your VD, is to do a run IRL in same gear as on the dyno and then tweak VD to match with your dyno peak numbers.