The reason to hold a selected throttle position when acquiring AFR data is so that you will tune every cell in the column for that throttle position. This is for the purpose of knowing what cells have been tuned and which have not. It's just a lot more directed and thorough. Obviously, only the cells in the TP column you are tuning will have trims generated if you stay only at that throttle position. In addition to maintaining one throttle position, I also deselected all other columns in the map so there was no way they could inadvertently be changed while doing tuning runs for the column I was focussed on tuning. Once you're done tuning one TP column, you SAVE the fueling you created to the permanent map in the PC5 and move on with tuning the next TP column in the same way. If you changed throttle positions while you were doing a tuning run and you had all cells in all columns activated for tuning, you would be gathering data for cells all over the map. It would be impossible to know which cells were left untuned. Two other points that pertain to DJ Auto Tune is that A) its sample rate is pretty slow and B) it doesn't produce accurate trims when backing off the throttle. Those are also reasons to limit your tuning to one TP column at a time, you do run after run until Auto Tune narrows in on the perfect trims only for the column you are working on. If you allowed Auto Tune to make trims all over the map, it would get very confusing. I believe my method of tuning one throttle position with Auto Tune is usally used to tune on a dyno as well.
DJ Auto Tune is capable of tuning as you ride the bike. You can enable it to change fueling all over the map as you ride. However, I have seen how it bounces the AFR up then down then up then down while I ride the bike normally. The reason is that I never hold a steady throttle position when I ride. Auto Tune isn't fast enough to keep up with how much I change throttle positions and it overwrites with faulty trims when backing out of the throttle. The only time Auto Tune works in real time is when I am cruising straight down a highway, then it takes Auto Tune about 3 seconds to get enough samples to create a stable AFR. With Auto Tune enabled while you ride, the trims it generates are applied to the map but they are not saved to the map at all (unless you manually save them with a laptop on the bike and I think you can also save with a POD-300). This is a good thing because as I described, the trims DJ Auto Tune generates during normal sport riding are useless. It's too slow to generate perfect trims while the TP and RPM are both changing faster than it can sample.
So there's why you focus on one throttle position with DJ Auto Tune. Also, I believe tuners do the same on a dyno even though they must have a far better sensors than the O2 sensor provided with DJ Auto Tune.
Sounds like Rapid Bike Evo has the ability to tune while you ride like DJ Auto Tune does. If it samples 300 times per second, it might work while you ride. I forget the exact number but it's only about 12 samples per second for DJ Auto Tune. Bazazz was slightly slower with 8 samples/second.
If the Rapid Bike Evo can sample fast enough, I wouldn't worry so much about doing tuning runs. I'd just get on the bike and ride and let the Evo do it's thing. If there are rpm/TP zones in the map where the engine rarely ever runs, no big deal, those cells will get adjusted if and when the rider operates the engine in those ranges of TP and rpm. I'm not saying there would be no reason for thorough, purposeful, focussed tuning but it would be a lot less necessary if the tuning system was lightening fast like we would hope they all would be.
There was a guy on here who was familiar with tuning equipment that was affordable and far superior to DJ. Was it
@Dennis ? LOL I bring him up every time this topic arrises.
My advice is to stick with the tried and true DJ systems if you ever want to do dyno tuning. I've been through it with Bazzaz and now they're gone. No telling what less known equipment will become obsolete. If you're only going to self tune, go with the systems that work well because I have heard those systems do exist. ...I'm just not sure which ones they are.
