timing tuning question

[theMelvster6]

Okay I realize tuning your ignition timing tables is best done on a steady state dyno, holding the throttle in a steady position and loading the engine. The idea is to pull timing until you see a decrease in torque output, then start to advance timing until it reaches its max torque and any more advance really doesn't change the torque output and doesn't cause preignition or detonation. I think I grasp the theory. I do have a couple questions....

How do you know what to load the engine to with our alpha-N system? Hold the throttle to a specific throttle position, then induce an eddy current on the dyno until it's in whatever ever rpm cell you are trying to tune?

About the actual adjusting of the cells...do you have to do a dyno pull, adjust cell abd burn to ecm, then do a pull and see results? Or can you run it in a steady state and advance/retard timing while it's running?

If I am way off on my understanding...anyone care to give me a rundown on the process. I've got access to a dyno and I'm learning to use it, just looking for a few pointers.

 

[buellxb9rs]

You can burn on the fly while running as for everything else, never messed with it so I'm not sure

 

[theMelvster6]

Yeah, I'm learning the whole dyno thing now that I have access to one. Hoping someone knowing the subject will comment. I have a bunch of efi tuning textbooks on order through Amazon.

 

[gbalias]

the dyno is not used to induce a variable load during tuning.

its used to keep the location of tuned cells stable while the adjustments are made. for the case of the buell, you would pick the location of TPS vs RPM cell and then keeping the load and throttle stable, adjust the ignition. of course not all cells can be reached long enough to get a good tune, and for those, an interpolated run across the cell range would be the best option.