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Thread: Tuning: afrBins2 table correct?

  1. #1
    Senior Member mriulvr's Avatar
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    I have made an ECM Bluetooth connector and begun tuning my 04 XB12S using MegalogViewer. She has a Hawk can, K&N air filter, breather reroute, NGK plugs, and 04XB12S race fuel map. When I use MegalogViewer and look at the afrBins2 I have the following, which is the same as the afrBins1:



    So, a couple of questions.
    1. Does this look right and should the front and rear have the same afrBins?
    2. From what I have been reading, the high RPM and high TPS cells look lower than what they should be. Should the 14.7 cells extend further into the higher RPM and TPS cells or is this what the afrBins2 for a race map should be?

    Just want to make sure that as I tune I am analyzing my datalogs against the correct maps.

    Just for background, after checking timing, TPS, and error codes my AFV was consistently running at 110% so I multiplied the fuel cells by 1.10, reset the AFV to 100%, and then took it for a ride and let it learn. Since then I have done two data logging runs of about 30 minutes and ran MagalogViewer VE. Each time I copied the rear map, pasted it to the front map, then added 2 to each cell in the front map. Runs smoother but idling has degraded a bit. I still have the stock NB O2 sensor and am considering getting a WB O2 sensor and a WB controller. Wondering if it is worth the time, energy, and resources to add an O2 sensor to the front for tuning purposes or if just converting the rear to a WB will suffice. How much of a difference will there be in terms of tuning with and without the front WB O2 sensor?

    I know, several questions and topics here. I know there are many of you who know what you are doing and provide expert advice, which I greatly appreciate and have learned so much from. Sometimes it is hard to distinguish the wheat from the chafe on the forum. I have read so much conflicting information about converting TPS10bit to TPS8Bit, y-axis setting and VE settings in MLV, tuning, WB O2 sensors, etc. I am figuring out who to listen to, who to LISTEN to, and who to ignore among those who are active on here. I, for one, greatly appreciate those who know there stuff sharing their wisdom with the rest of us. Love my Buell. Wanted one since a friend of mine in Colorado bought one in 1992. It was love at first sight. I want her give me many more years and miles of smiles and eventually add an 1190SX. Might be a present for myself when I make tenure. :D

  2. #2
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    Use vebins2 and afrbins2. Add an 02 bung up front for datalogging but unless you upgrade your electrical system and ecm you can't leave one in there and the stock ecm be able to use it. Yes to the wideband. It will make tubing much easier, faster, and give a much better tune. It's not absolutely necessary for tuning but it helps majorly. Also you can leave the wb in after tuning or you can swap back to the narrowband once the bike is tuned.

  3. #3
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    I'm putting two extra o2 bungs in my header, one for the rear and one for the front right where it's easy to get to. That way I can leave the narrowband in place, but still tune with a wideband and be able to swap between front and rear easily. You can feed wide band voltage straight into the ecm through the NB connection, turn off the o2 sensor and standard corrections as normal and ecmspy will record the wideband data. Always tune the closed loop to 14.7 if you want to keep standard corrections once it's tuned. When you get the tune good, hook the NB sensor back up and you're good to go. An INNOVATE LC-1 WB kit is only like $150 on eBay....a little older but they are still one of the best.

  4. #4
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    Good Info Megalog Tuning and Innovate LC-1 install also read the ecmspy tuning manual...the second version has a lot more info. Helps get a good grasp on how the ecm works and using ecmspy.

  5. #5
    Senior Member mriulvr's Avatar
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    I've used ECMSPY for a couple of years and MegalogViewer for a month. Read everything I could find before using each. The thing I was wondering about was the AFV values in the afrBins2 file and if they looked right for a 2004 XV12S race map. From what I have read they looked lower in the upper RPM and TPS ranges. Just want to make sure that the afrBins2 file I am using to tune is correct.

    The idling issue has improved with the last two tunes. One weird thing that happened was that VE analysis was giving me really high values in some of the cells, too high. They converted to 0's and 32's in the resulting rule map. I used the smoothing function of Megalog Viewer to get them more appropriate and less of a big change from adjacent cells. Haven't ridden with this map yet as it has been 102 degrees here all day. Definitely going to look into the Innovative LC-1 WB O2 and run on both front and rear cylinders. The tuning info for the front map seems like such a guess and makes a lot of assumptions about what will work.

  6. #6
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    The webpage I posted about the LC-1 goes over exactly how to setup the software to tune with a wide band. In MLV you can adjust the AFRbins as you please, VEanalyzer just uses it as a reference to try to adjust fuel values to those AFRs. You could make your WOT AFRs 13.4 instead of 13.0. Make sure to adjust the whole AFR map so the transition is smooth between cells. I would keep the closed loop at 14.7. That gives you most efficiency at cruising throttle positions. It's just difficult to tune the open loop effectively with a narrowband, it'll always be somewhat of a guessing game. A lot of people do the +2 method for the front cylinder which gets you close but not exactly on. Also...you could change your cell change to hard in MLV, it requires more data to cause a change to the fuel cells.

  7. #7
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    the benefit of using a WB is the ability to skew the ECMs interpretation of 14,7

    iirc i have my bike running at around 14.2 at cruise and even leaner in the decel (16:1, etc)

    runs smooth, cool, and i get about 45-47mpg. this is possible only by setting up the output of the WB to a certain voltage afr range.

    im in houston where its hot as balls and 45115423% humidity.

    it takes time to get it right and even more time to understand how the ecm treats the corrections, but you will probably want to adjust the analysis table based on mods, etc. i generally go through almost all data points within mlv and compare them to my afr expectations on my own prior to accepting the new table for the bike. i start the log where the engine temp is above 160 or so, then press the right arrow on the keyboard to determine the map cell location and note the afr. then you have to look to see if you were steady, accelerating, or on decel to see whethtr or not the desired afr is reasonable as well as the recorded afr.

    anywho, i could go on and on about it. just do a few iterations and call it good. lol.

  8. #8
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    ^^^Well if you are going to listen to anyone about tuning it gbalias or xoptimizedrsx. A user with screen name by ICH might post on your tuning thread...he posts in German. He's an asshole!

  9. #9
    Senior Member ich's Avatar
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    aber er weiss wenigstens wovon er spricht. das macht den unterschied.

  10. #10
    Senior Member mriulvr's Avatar
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    Ich habe tatsächlich genossen Lesen Sie Ihre Antworten auf einige der Tuning-Beiträge. Viel gelernt und es war unterhaltsam.



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