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Autotune options

every now and again, i found it would hunt, even after the PCV/AT installation. (It did so before as well) wasnt an issue at all, since it didnt happen much, never stalled and it was only a quick hickup, but i got curious.

Turns out, it gets SUPER lean below idle (easily reaching 17:1 by 750rpm, only 250 rpm below my idle speed. So the problem was, the idle was good, but if anything caused a drop, (which happens sometimes, i dont know why) the power decreased so rapidly as it got super lean that it produced an even bigger drop, at which point the ECU takes over and corrects, thus hunting. This area was not mapped in the base map, because let's face it. You shouldnt have to, and there is no good way to do it without wasting up your clutch.

I found i had to add a HUGE amount of fuel to my 0% throttle at 500 & 750rpm, like about of 20%, which are often ignored/set to 0% correction because of how irrelevant they are to riding. Now the idle is perfectly steady at 1000 rpm exactly, and it never budges.

Of course, this is for my 2v, so it's probably a little irrelevant to your bike. But just for giggles, connect the system, get a good hold of your front brake, and slowly let the clutch out to lug the motor down and see what AFR shows up.
 
Guys, be aware/careful of the reverse pulses that make it to the sensor at low idle... Chris, just let Autotune handle it with a max of 20% +/-.
 
Spaceclam said:
...to my 0% throttle at 500 & 750rpm, like about of 20%, which are often ignored/set ...
Click to expand...

The point is, the auto tune never really gets those ranges unless you purposly lug the motor down at idle. While negative pressure pulses are something to be aware of, the fix works.
 
GT-Rx said:
Guys, be aware/careful of the reverse pulses that make it to the sensor at low idle...
Click to expand...
In the words of an infamous fish and chip shop owner and one time Aussie female federal politician - please explain. ;)

I am a bit of a NOob with the physics of engine fueling, so please enlighten me :roll: What are these reverse pulses you speak of, what causes them, why are they a problem, and are you talking about the O2 sensor in relation to these pulses?
 
Chris asked a question. Much like cells above 3k RPMs @2% throttle, AT will make huge corrections because of reverse pulses if you let it. I recommend not let it go above 20% +/-, because the cells are not fixed, meaning they "bleed" into all cells around them.

Mike, at closed throttle, especially at low and higher RPMs, (in simple terms) the motor is sucking air back through the exhaust, hence the 02/lambda gets artificially high (lean) fuel readings.
 
Ah I feel better now - interesting - it must be a bit like the problems of a tuned pipe on a two stroke at low RPM. I'll be sure to keep an eye out for them there pulses in my exhaust. :D
 
Mike.C said:
it must be a bit like the problems of a tuned pipe on a two stroke at low RPM.
Click to expand...

Same effect, yes. This is why you can tune an airbox/exhaust on four strokes as well as two strokes.
 
No worries Todd, things are working great. I was just asking out of curiosity, interesting to see what others are trying. I imagine there are lots of theories out there as to what works best. I'll stick with your recommendations, I know you've been at this for a while and have some historical knowledge, just let me know what tweaks work best as you fine tune your own setups ;)

Chris
 
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