Add on to test for best timing on a dyno

[Yves]

Is there some add on that would allow you to arrive at the best timing when you're holding the engine at a given rpm and you increase dyno load accordingly ?

[BigBlockMopar]

It has been discussed before here:
http://www.msextra.com/forums/viewtopic ... 22&t=56475

Really want to see something like that too, but I think only a few folks are really interested in this. Mostly the ones who don't know Java...

I do think there's one 'catch' to solve though... There's no physical connection to the Dyno and TunerStudio, so how does the Dyno or TS "know" when best power/best timing has been achieved? By User input?

[Yves]

As far as a know a dyno has a closed loop type of control that keeps the engine at a certain rpm by varying load. So the engine would have to increase throttle until at a point where additional throttle input doesn't result in an a higher load/rpm. At that point you begin tuning the ignition by varying it upwards. Of course you would need an input from the dyno that represents the power made. As far as I know most dynos have 0-5V output for that purpose. You could get that into ms with some of the generic inputs.

[BigBlockMopar]

You're right about the closed loop part on the dyno to maintain speed while increasing the brake-load.
I don't know if the dyno I went to has this option, probably does.
But I could ask the next time I'm there for a new session.

[Paul_VR6]

Almost all of the brake dynos can hold rpm. The important part is keeping the rest steady (tps or map).

[Yves]

So from what I understand there is no such thing to have this automated.

[9secz]

Sorry if this is all wrong, but I thought load dynos displayed power in real time as they hold rpm constant. I'm picturing 2 guys, one guy holding MAP constant by modulating the throttle, and the other guy nudging timing until max power at that RPM/MAP cell is reached. Then move to the next RPM/MAP cell.

This is what I planned to do if I ever get around to making a dyno appointment.

Jeff

[Yves]

hm, I thought that an engine dyno at least had some sort of throttle control as well. Not sure about the rolling road types. For those I assume at least you need your foot, which might explain some erratic tps and map behavior.