I have been reading this thread for nearly a year now.

I finally jumped in and got the PV and a filter from Fuel Moto. I ordered Tuesday and it showed up today. Thanks FM

Installed and ran the tune FM installed..I cannot believe the performance difference. Only been on a short ride and do not have all the gauges set up yet, but I am totally surprised.

Now that I have the PV , started playing with it, and seen the different options some of the technical posts make alot more sense.

 

Recently my bike experienced a large change in gas mileage. Last fall it was getting 40 mpg but gradually degraded over the winter to getting only 29 mpg now. The last five tank fulls have averaged 30 mpg.
I did notice a faint odor of gas and when checking the plugs noticed that the front plug was wet. Changing all the oils and plugs, and cleaning the air filter did not help.

I ended up taking it to my local indy. He said that it showed a overly rich mixture across all areas of throttle openings. He selected different MAPs from my PowerVision and gave them a try. He found one that was pretty close to what it should be although a bit rich.

My question is this. Why would a MAP that was working perfectly suddenly become rich enough to cause a 10 mpg loss in fuel economy? Can the MAP degrade on its own?

 

I would suggest that the map was not working as well as you thought. How long after putting that map in did things start to go south? Did you do any collection run with the old map to confirm it was optimal for you build?

 

did you recently change your fuel filter

 

Still learning. If you data logged for spark advance, and did a calc tune what would change and why would it change?

 

After you do your tune with log tuner is it a good idea to use the smooth option on the whole Spark Advance Tables and the VE Tables?

 

I've used the smooth function for me VE, but not tried it yet for timing. For VE, I did some good collection runs to hit all the areas I could, and then smoothed the entire tables; a couple if iterations of this. Once I got close, I'm now just in closed loop up to 3500 rpm and 70Kpa and just smoothing this area. Now, as I collect and smooth I'm noticing that my subsequent tuning cycles are more consistent. What I mean by this, my first few times smoothing the subsequent new collections would "unsmooth" the table somewhat dramatically. The more I've done this, it's tightened up and subsequent tune/smooth cycle deviate less.

Compared to just tuning with the collection and not smoothing, it seems the bike does run smoother over all.

I'm still working on my timing tables and might consider smoothing those as well. I will say I like keeping those at whole numbers as it's easier to see what the PV is changing on me. If I see a spark correction, I will drop that further to the whole number value as PV makes very small changes and I want a bit of a safety buffer. Possibly when I feel that it's as good as it will get, I'll consider a smooth. I'd be curious as to others experience here.

 

I think your O2 sensors might be going bad. Once it's loaded, a map won't change, but your bike will use adaptive control to adjust mixture, based on input from the sensors.

 

I'd agree - curious if the previous rich condition could have sooted up the O2 sensor and caused the degradation over time. If so, might it "clean up" if the new map is more accurate?

 

All my timing that has been coming out has been from 2750 rpm to 4500 rpm in a fairly random rectangular pattern and from 20 kpa to 100 kpa. I like the whole number idea but I might try to the half. I have cells for example that have went from 41.00 to 40.99 Does taking out that little timing make much of a difference?