RomRaider

Yes, rear diff.

Bumping this as I have just started using it. I am curious as to how accurate or "realistic" the numbers are that the dyno produces. Is it just a means of comparing or is it fairly close to what an engine dyno would read?

Thanks.

No it won't match an engine dyno as this is based on a moving mass on a road with many other variables at play.
This will give you a raw representation of "your" vehicle under certain conditions. Those conditions are weight, fuel, wind, tires, humidity, air pressure to name a few.
If you can keep those conditions constant then you can make a judgment about a tuning mod you made to your car, for better or worst.

There is no correction factor being used to get the results back to an SAE corrected WHP & TQ. For that some additional code is required with user input for the correction to be accurate.

Thanks for the explaination. That being said, the number that is generated would be a "Crank" hp number and not a "wheel" hp number, correct?

It's wheel HP as we don't have a reliable method to determine the HP loss through the drive train from the wheel to the crank.

Hi,
If it's possible please add check box for not to use WOT to start recording, but only monitor RPMs (when it pass for ex. 2000 rmps start record).
It let to use road dyno for older Subarus (as far I know they doesn't have Throttle Opening Angle monitor by ecu). Other needed things as rpms and speed are available. Definitions are no problem.
The other thing is to add boost chart to dyno chart.

Might make sense to add the parameter list and let you choose to add whatever you want to the plot.

I'm aware of the problem with older cars only having throttle voltage and I started to re-code to work around that issue. So one of these days I will get that finished.
In the meantime, you can create a log of RPM and Throttle Voltage. Then load it into a spreadsheet and for the WOT section of interest just enter 100 replacing the voltage value.
Save it as a CSV then you can use "Read from File" checkbox and load the modified file into the Dyno tab to see what you get.

That would be great!

Which of these values are meant to be higher?

Crank HP will be higher than wheel HP.

As "standing mile" racing seems to become more and more popular (at least here) would it be hard to add full mile tab to for the Road Dyno? Similar to 1/4 mile.. Even better both combined in same run.

I don't see why not, it's just calculating distance covered from speed and time and stops at 1/4 mile now.

How about this?


Is it possible to see this feature soon? It would be great to see this on dyno.

I know this kind of problem vom germans dieselschrauber.de community, where they got the same problems with there off-line tool "Durchzugsmesser".
This tool is nearly comparible to Road Dyno.

They calculated the friction loss of the drive train, but the results are not very well.

Best way is a "roll-out-test", were you measure time an loss of speed, when you roll out with clutch pressed.
Depenting of this values you can calculated the friction loss and use this as a base for calculating engine break power from wheel power.

This is also the way a "dnyo" teststand calculates the power from measuered wheel power.
But of cause with this, you can bend your engine power in all directions, when you got no good roll-out-measurement...

The problem:
I got plenty of discusstions on this calculations, but there are all in german and my english is not good enougth to translate all correctly

BR Jochen