I think stock ecm auto tuning works
#1
08-27-2018, 12:53 PM
I think stock ecm auto tuning works
The newer bikes, the ones with oxygen sensors, (narrow band), will try to auto tune the map installed in the ECM. I am not exactly sure how it works except to say that the o2 sensors sense if the exhaust gas is rich or lean and if it is lean it adds a small amout of fuel to a cell and if it is rich it removes a small amount of fuel from a cell.
I can tell that it words for my bike. I have many examples, but here is the latest....
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
I can tell that it words for my bike. I have many examples, but here is the latest....
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
#3
08-27-2018, 03:56 PM
Seasoned HDF Member
The newer bikes, the ones with oxygen sensors, (narrow band), will try to auto tune the map installed in the ECM. I am not exactly sure how it works except to say that the o2 sensors sense if the exhaust gas is rich or lean and if it is lean it adds a small amout of fuel to a cell and if it is rich it removes a small amount of fuel from a cell.
I can tell that it words for my bike. I have many examples, but here is the latest....
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
I can tell that it words for my bike. I have many examples, but here is the latest....
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
Notwithstanding, there are some learned values that the ECU saves for fuel control, called 'trims'. That's probably what you are referring to. In your case, the trims probably compensated for your change in fuel, as they should.
#4
08-27-2018, 04:42 PM
Seasoned HDF Member
#5
08-27-2018, 06:04 PM
The same thing happened after they cleaned my air cleaner. When I rode it home it was rougher than I was use to. But after some miles it smoothed out just the way it was before.
#6
08-27-2018, 07:15 PM
Elite HDF Member
#7
08-27-2018, 07:29 PM
Stellar HDF Member
The newer bikes, the ones with oxygen sensors, (narrow band), will try to auto tune the map installed in the ECM. I am not exactly sure how it works except to say that the o2 sensors sense if the exhaust gas is rich or lean and if it is lean it adds a small amout of fuel to a cell and if it is rich it removes a small amount of fuel from a cell.
I can tell that it words for my bike. I have many examples, but here is the latest....
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
For some reason I had a tank of 91 octane in my bike. The bike ran a little rougher than normal. I drained the tank an replaced it with my usual 93 octane. On Saturday I went on a long ride. For the first 50 miles or so my bike was running a bit rough, but then it smoothed out and ran and sounded just like it always did.
The moral of this story is, I really do believe that, with the newer bikes, the more you run them the better they will run, if you have a good map installed. One of the keys to making this work, you have to have a map that is close to correct. The o2 feedback will do the rest.
I think.
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#8
08-27-2018, 08:08 PM
Ok, you have a bit of an oxy-moron going on in your post and that's why there's some funny feedback.
First the topic is; "I think stock ecm auto tuning works"
And your right, the Electronic Control Module does function and makes the engine run properly.
But then you add;
"you have to have a map that is close to correct. The o2 feedback will do the rest."
So,, "map" means you have somehow modified the ECM. Once the ECM has been modified by an outside source,, it no longer functions as the stock ECM. While the ECM may still be reading the O2's during the engines operation,, it will only do so as described buy the installed "map".
"map" and "stock" are two different things.
p.s. bad gas is bad gas.
First the topic is; "I think stock ecm auto tuning works"
And your right, the Electronic Control Module does function and makes the engine run properly.
But then you add;
"you have to have a map that is close to correct. The o2 feedback will do the rest."
So,, "map" means you have somehow modified the ECM. Once the ECM has been modified by an outside source,, it no longer functions as the stock ECM. While the ECM may still be reading the O2's during the engines operation,, it will only do so as described buy the installed "map".
"map" and "stock" are two different things.
p.s. bad gas is bad gas.
Last edited by JohnMn; 08-27-2018 at 08:09 PM.
#9
08-28-2018, 11:08 AM
Here is a good explanation of how the narrow band o2 sensors work on our bikes (I am assuming they work the same for all vehicles more or less) After reading this I have to admit, I am not sure why the bike smooths out after ridden for a while but it does. And it remembers it.
Narrow Band O2 Sensors began to appear on vehicles with the advent of fuel injection in the 1980’s. Their purpose was to monitor component degradation (i.e. fuel injectors, vacuum leaks) of vehicles as they accumulated miles. Their basic job was to let the computer know whether the vehicle was running at an air/fuel ratio of 14.7:1 under idle (ideal ratio for gasoline engines), moderate acceleration, and cruise conditions, and if it wasn’t, to “trim” the injector pulse-width to either slightly lean or richen the engine. When the computer is paying attention to the input from the O2 sensor, the engine is operating in a “closed-loop” capacity. Under heavier acceleration or wide-open throttle the computer ignores the O2 sensor because it requires an air/fuel ratio other than 14.7:1, which is outside the design parameters of the sensor. This is known as “open-loop” operation. The sensor lets the computer know if the engine is running above or below 14.7:1 by sending voltage to the computer in a range between 0 and 1 volt, usually sweeping between the two extremes of this scale. AutoMeter’s traditional narrow-band air/fuel ratio gauges are simply a voltmeter for this signal. This can be seen by the repeated sweeping back and forth of the gauge in most idle, light throttle, and cruise conditions. To summarize, a narrow band O2 sensor is only able to tell a computer (or gauge, for that matter) whether an engine is operating above or below a 14.7:1 air/fuel ratio.
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lh4x4 (08-29-2018)
#10
08-28-2018, 07:35 PM
Sorry Bob, it's still pretty vague.
Yeah,, O2's are part of the system that adjusts to real environment as the engine runs.
The factory ECM does not auto-tune to your riding style or engine configuration,, and/or have a memory.
The ECM with all of the sensors on the engine adjust to real time conditions as the engine runs.
The Only "map" programmed to/or remembered by the factory ECM is the factory settings and what is happening in each moment with the engine.,
Your bike "smooths out" after running for a bit because it actually got up to temp. The difference between old bikes and new bikes,, is you don't have to mess with the choke cable,, the "ECM" does that for you.
Yeah,, O2's are part of the system that adjusts to real environment as the engine runs.
The factory ECM does not auto-tune to your riding style or engine configuration,, and/or have a memory.
The ECM with all of the sensors on the engine adjust to real time conditions as the engine runs.
The Only "map" programmed to/or remembered by the factory ECM is the factory settings and what is happening in each moment with the engine.,
Your bike "smooths out" after running for a bit because it actually got up to temp. The difference between old bikes and new bikes,, is you don't have to mess with the choke cable,, the "ECM" does that for you.