Inside the "Triple Nickel"
- Thread starter blsnelling
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Big_Wood
westcoast dweller
my only thing with the autotunes is that ported or not the AT system is always looking for RPM's it should be running at regardless so while a ported saw may still make more power then stock it is not reaching it's full potential cause AT is killing potential by keeping RPM's to within stock tolerances. only way AT can do that is feeding it more fuel making it run rich. i think this is what hamish is talking about. if a guy could reprogram autotune to compliment the porting i bet the AT saws would be even better. i do like my saws a tad rich though so maybe porting puts the mixture in the perfect spot.
It doesn't work that way at all. If that were the case, you couldn't mod an AT saw. Instead, it's constantly looking for max RPMs, not some predefined RPM.
Big_Wood
westcoast dweller
Big_Wood
westcoast dweller
so yer talking about max RPM's in wood? concerned that might be to lean but it seems these saws are pretty good. only heard of a few with roached top ends so far.
The perfect tune is max RPMs in the cut.
Big_Wood
westcoast dweller
so i suppose when the AT does it's lean out test it will notice a loss in RPM's if it goes to lean and rich'n back up from there? nifty, learn something new everyday. here i thought RPM's were preset from the factory. and figured AT would make sure it stayed in those RPM's by controlling fuel supply.
l think people see AT/Mtronic systems as WAY more complicated than they are. They are probably one of the simplest more reliable components of a saw. When we don't understand something we either fear it or think it is far more complex than it is.
sachsmo
Addicted to ArboristSite
Having worked on more complex systems in industry, the autotune/M-tronics have very simple programs.
The lack of inputs makes the program 'boxed in".
The engineers who design it must figure in safety margins (to cover their arse on warranty)
Longevity will always trump Max performance in these loops.
The lack of inputs makes the program 'boxed in".
The engineers who design it must figure in safety margins (to cover their arse on warranty)
Longevity will always trump Max performance in these loops.
I've had mine a couple years, an early one. About my favorite new saw for the farm. Enough of all the right things and not too much of any of the wrong.. (Light, enough power, not too expensive). Been part of a couple of year argument (all in fun of course) between me and spike60 about what is the best firewood/farm saw on the planet. For me it's the 555/2258. Really haven't even thought about mods, the thing runs good enough stock.. and starts easy too. Bought a Sugihara for it before the channel and prices got wacked.
SawTroll
Information Collector
I would think there are a limit somewhere, as to how much it can change the fuel supply?
old-cat
Fir Man
You're talking about me! I'm truly guilty. Maybe I should get me a 555?
Sooner or later the electronics will follow the rest of the motorsports world and get to the point where fuel & timing curves can be tweaked... not there yet! But that will be another way to get more out of mods. Can't wait...
sachsmo
Addicted to ArboristSite
I can!
But you are right, someday you will need to hook your smartphone up to your saw and buy a programmer app to out hustle your buds eh?
But then again, a fella that can set and sharpen a crosscut may be in demand, the future is unknown?
But you are right, someday you will need to hook your smartphone up to your saw and buy a programmer app to out hustle your buds eh?
But then again, a fella that can set and sharpen a crosscut may be in demand, the future is unknown?
Would one of you explain this? I don't understand how it works at all & can't seem to find any info on how it works.
Termite
Time To Launch
I had to think on that one for a moment.
BBP, one thing I have to remind myself every once in a while is how much faster electronic controls work in relation to the speed of the saw. One rpm on a 13k rpm saw is equivalent to years in electronic time.
I haven't read any tech article on AutoTune, but here's how MTronic works. The tach in the coil monitors RPM multiple times per second. It signals the servo that replaces the H needle in the carb to either add or pull fuel. Depending on how that affects RPM, it will make another adjustment, thereby constantly tuning for max RPMs. There are no other parameters besides RPMs for WOT tuning. It knows nothing about O2 levels, MAP, or the like. It knows nothing about timing. Timing is fixed with preset values, also based on RPM. It is not adjusted real time like the fuel. It has set parameters. Hereby, the saw is capable of tuning itself for changing weather conditions, fuel quality, porting, etc. As these variables affect fuel needs, the saw senses it through how fueling changes affect RPMs, and adjusts accordingly. It really is just that simple.
Mastermind
Work Saw Specialist
"It really is just that simple."
Love it.
Love it.
