weedkilla
Ain't no guru of nuthin'
Essentially that's how you tune on a dyno. You are tuning for max power in the band of revs that you cut in. Id say that's perfect.what about tuning for time?
I spent a lot of time messing with the MM084 and TM880. In the end I settled at 12,500 on the 36" bar. I got a lot of comments that they sounded too rich. But that is where they cut the best. I tried 12k, 12.2k, 12.5k, 12.7k, 13k. 12.5k was the best times.
Then what about the 361 oil test? For a stock saw I tuned each ratio to the called for idle (think it was like 2800) and then top end for the called for 14,000 wot. I'm sure the best ratio would be different for a different oil. Probably closer to 32 or 40:1.
But look at the times and temps. The fastest times are right around where the coolest temps are. Same with the 660 test (see attached).
Seems to me it would be a lot easier to just figure the fastest cuts for each bar and note the RPM used. Then just tune to that RPM.
Obviously double check make sure by ear your not to lean...seems very unlikely.
Thoughts on this approach?
The fact that you are using a simplistic temp measurement to back it up is great. I only say simplistic, in that it's not reading exhaust gas temp before the muffler with a high sample rate.
The same approach could be used to optimise ignition timing.
You still need to make sure you don't introduce a problem at other points in the power band - like stumbling as you hit the throttle for instance - but you have a baseline that you don't want to go leaner, or more advanced.