My mechanic friend and his partner do a lot of dyno work for cars from all over the world. He told me that if the chip and programme are "modern" then they automatically adjust for a particular driving (riding) style. For example, when they are testing and maintaining cars they might drive harder and so the injectors will self adjust passing more power to the car until the driving pattern changes.
Now this might be wrong or "lost in translation" but I am curious to know more about this from anyone with more insight. If this is the case, then slight mods like changes to slip ons would see a self adjust.

 

The harley closed loop system has some open loop sections where they richen the mixture out of a 14.7/1 ratio. So in these areas it will not self tune out. These areas would be high load pulls and wide open throttle. Now on my 06 WG I have swapped mufflers to SE 2+ and reading plugs it did just fine. I haven't tested a better flow air filter assembly so not sure how the open loop sections would be. It will definately be leaner, and far leaner then the majority of people on this board and others like on there Harleys. But then again most feel they need a 13/1 ratio for a reliable engine. So more toyour questionyour friends are correct to a point. Accept it is the ECU BLM's that are learning not the injectors. And while closed loop it is a 14.7/1 ratio the harley ecu will not change that due to riding habbits. You want to change that you need a PCIII, SERT, DTT, TMAT, or some other management system.

 

I am not sure if i want to get into this mess....but, I came across this..This site believes as i do, a closed loop EFI with 02 sensors needs no remapping...Everything is adjusted for automatically. http://www.nightrider.com/biketech/2...erformance.htm

 

They do not fully adjust like a car, they are limited in what they adjust on AFR. you will need to remap especially if you change to a Stage 1 AC and possibly slip-ons. the new HDs already run quite lean and without a remap they really run lean. had to do it to both of my bikes to correct the problem. also helped the heat condition on them also.

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The reason that Harley's can't self adjust is because its not a 100% closed loop system..They run a two wire O2 sensor...Zippers makes a true closed loop system that can adjust to the bikes needs in real time...But it still requires a base map to start from...PCIII and SERT don't allow your bike to adjust anymore than stock what they do is allow you to program a richer base map...and the PCIII uses O2 sensor eliminators so it takes away any adjusting the bike was able to do...

 

I'm definitely going to repeat some things that have already been said so I apologize in advance for that. There is just so much misinformation out there on this topic that it is frustrating. Part of it is intentional by vendors and so-called experts and part of it is from people who unintentionally only explain part of the story on a website (which causes people to see things they believe to be contradictory and yet both are true) and the rest is people who just don't understand this stuff at all spreading crap around the internet. Of course I won't FULLY cover it either so something I say here is probably accidentally misleading or incomplete but I'll try my best to avoid that.

Only VERY recently were any systems created for the street that are closed loop at all times. NONE that I know of are sold in production vehicles. Perhaps some recent advances in wideband sensors are making this practical, but so far I've only heard about these types of systems in performance aftermarket systems. Traditionally the necessary sensors have been too expensive and they haven't been durable enough.

There are lots of little proprietary varations and enhancements (like"driving style" tweaks), but in general the typical automotive systems work the same way as the Delphi system in the newer HD's in that they are closed loop during cruise and open loop during warm-up and wide-open-throttle (WOT). With normal oxygen sensors, a closed loop system is useless as an engine is warming up or during WOT when air/fuel ratios (AFR) are too low (rich) for the sensors to measure. For both car and motorcycle systems, the values for AFR are programmed into tables in the computer. During cruise conditions though, the target AFR is in a range that inexpensive oxygen sensorsCAN measure so the system goes into closed loop mode and WILL make adjustments until the actual measured AFR oscillates near the target value.This adjustment capability means that emmisions and fuel consumption are optimized for a large part of your driving time. But once you give it some throttle and the computer calculates a target AFR outside of the measurable range, you go strictly from a programmed table. There have probably been efforts to "guesstimate" howadaptations made during closed loop modemight be extrapolated to WOT, but this would be seriously inaccurate and probably hasn't been used for a production system other than to be a proportional thing like an elevation adjustment or to predict a clogging air filter. Neither of those examples is anything like changing an exhaust system.

Here's one example of how you can read two contradictory statements about EFI systems that both could be interpretted to be true.Some people would say that many car EFI systems would ADAPT to changes in the intake or exhaust. This isn't technically accurate, but it is partially true. Some car systems (often in performance cars)use a Mass Air Flowmeter toactually measure the mass of the intake air and meter the fuel accordingly.

This is significant because other systems don't DIRECTLY measure the quantity of charge air (in order to know the amount of oxyen). Some systems use a volumetric flowmeter. But the mass of air (and oxygen) is not constant with respect to volume. Temperature, pressure (or vacuum), and humiditywill vary the relationship of the volume and the actual mass of air. Other systems use a manifold absolute pressure (MAP) or vacuum reading to determine the air flow. This is like the Delphi system on the newer HD's. It'saVERY simple and VERY reliable system but it is definitely an INDIRECT way to measure the mass of the air. So changing something in the engine will change the relationship between the MAP sensor readings and the mass of air. Unfortunately, a Mass Air Flowmeter isn't practical on a Harley because you need a length of straight pipe to use flowmeters (accurately anyway). Contrary to what is of