Hey all. Just wondering if there are any good mapping strategies out there. I've got a 2008 TE450, powerup, with a PC III. I didn't have luck with the PC supplied maps on my bike so I experimented and made a very basic map with the help of an O2 gauge. My map simply corrects a fuel deficiency @ 3500-5250 with +4. Runs ok, consistent fuel at most rpms, but still a bit lazy. After reading about the dynojet tuning center method of map development (making trim values per load at each throttle position) , and also the AutoTune device, I see that my map is not ideal for best performance because my map still relies on the ECU curve to normalize the mixture during acceleration. Since I almost always see an O2 dip during acceleration I conclude that the ECU curve, at least on my original firmware ECU, kinda sucks. It seems as if one could approximate the tuning center strategy, on paper. Which is to say, instead of just correcting the static rpm mixture, we could create trim values which would enhance the ECU curve as the motor is accelerating (under load). Suppose we measure an unloaded rpm for each throttle position (0,2,5,10,20,40,60,80,100), using 3rd gear and flat ground. If we start with a statically-corrected map, which in my case only required a corrected 3500-5250, we can use the unloaded rpms for each throttle position as a pivot point. Any rpm below that point should mean the motor is under load/accelerating, and above that point should be decellerating. If we made a map with increasing trim column values below each unloaded rpm, we should see an acceleration boost. The values would take some tweaking, just small values to enhance the existing ECU curve where it fails to maintain good fuel. The important thing is to recognize the unloaded rpm points for each throttle position. Unknown how much these change per gearing, so it may need to be more than one cell tall. It may also be possible to trim each unloaded rpm point back to an economy setting, while still maintaining acceleration boost whenever the rpm falls in each throttle column. Anyways, something to consider. I will try to gather the unloaded rpms for my bike. It shouldn't be too bad since I have the lcd unit, but it still might be time consuming.
Not that it's directly related to your theories, but have you looked into the "accelerator pump" feature on the PCIII? You can set it to deliver additional fuel when advancing the throttle. Need to download the software from Dynojet, then enable it when connected to the PCIII. I've wasted a huge amount of time trying maps that work on other peoples' bikes. Mine is a later build '08 SM510R and it needed only a slight richening up at low throttle position and low RPM, similar to yours. Next I plan to play with the AP feature. I had done so before but was still figuring out what was what and turned it back off while I got the basic map dialed in.
The a/p feature works pretty well. I have played around with it some. It helps a lot to improve the throttle response but the motor still delivers a rather unexciting acceleration. It's too bad it requires a computer to change the a/p parameters. They should have allowed that to be set via the lcd unit. Would make things a lot easier.
