| Author | Message | ||
     Jle249 |
Finished installing my FMF APEX slip-on exhaust onto my 2009 1125r today. Sounds great! How long does it take for the ECM to adjust and "re-learn" the new parameters the bike is running under. I've only taken it a few miles since installation, mainly just to check structural integrity, and experienced no problems or decel popping. I will run it harder tomorrow. Does the computer instantly re-adjust or does it take a while? Thanks in advance. | ||
| Tbowdre |
no expert here, as I understand the BUELL FI, it learns when cruising at steady state, say 3500rpm for a couple minutes. Then applies this learned AFV to WOT stuff | ||
| Froggy |
It will make adjustments as you ride, but its not going to be enough to compensate correctly for the pipe. I recommend you get a tune. | ||
| Slypiranna |
It will remain very lean no matter what you read herein that says otherwise pertaining to CL operation/learning capacity with the 11. Fact. It must be tuned to the mods in locked OL. Fact. We've been over this at least a hundred times since Jan 08...no ill meant. Does the search function really do anything on this website or are folks just not using it correctly?...or heaven forbid if it's been deleted!? | ||
| Sknight |
The computer will self adjust to most any condition that will occur with a stock setup. You change the mechanical airflow properties then you're probably going outside of the computers ability to adjust. The more you change the worse it gets. | ||
| Tbowdre |
how much can a slip on really affect fueling with no other mods? This is the bottle neck changing airrflow properties? What about everything else? I could understand a full exhaust system, bigger air box, head work, blah blah then again WTF do i know.... LOL seems like no issue to me | ||
| Jle249 |
Thanks gents for your two cents. Your input is appreciated. Hey, Slypiranna, FACT: you didn't have to chime in if it bothered you on this "101st" time. You know, you can just simply disregard the post while the rest enjoy the amity of the group. After all, it's Saturday night and you're on Badweb just like the rest of us dateless dudes. FACT: I did use the search function and the answers are all so varied. Open your own board so I can just go to you and your infinite wisdom next time and save the time.  | ||
| 1_mike |
Tbow - Yes, you are incorrect. A slipon exhaust WILL put both the "learning" out of it's comfort zone...and even if it does "learn"...as Sly states...the ECM will STILL be "lean". NOTHING can be done to make the engine happy without external adjustment..! It's interesting...after all this has been discussed...it's new all over again. I guess it's similar to the "search" function. While I agree..the "search" function is difficult to use on this board...it DOES work. Mike | ||
| Sknight |
A slip on can either greatly harm or have near zero effect and anywhere in between. In the case of an 1125 I'd imagine it would change the airflow quite a bit. Stock is a three pass obviously designed to induce a certain amount of backpressure. Unfortunately unless you actually measure the airflow drawn in you really can't tell. | ||
| Xnoahx |
I think you see stuff like this on every forum. "I got a slip on, do I need a power commander?" Things like that. ••••••••••••••• tune in your future | ||
| Moosestang |
Learn is such a strong word. I'd say guess is a better term for what the ecm does. It's hard for it to guess what fuel is needed in open loop based on what it sees in closed loop, imo. | ||
| Vosnick52 |
I installed my slip on and was told to ride for 15-20 min at 3.5-4k rpm. AFV's before f 100 r 100 After the 20 min ride. f 110.5 r 100 | ||
| Cafefun |
In 600 miles my afv's never changed. bike was all stock but I still expected them to change. | ||
| Strongbad |
It's a gross oversimplification to say that the engine is going to run lean with a slip-on. Some areas may be lean, some areas may be rich, or some might be right where they need to be. It would be best to get it tuned via some method, but may not absolutely necessary. Best thing to do is at least run it with some lambda sensors and see where it's at. Most slip-on pipes actually hurt power as they shorten the exhaust too much. With this particular motor, you can't fit a long enough pipe to reach optimal power. | ||
| Buelldyno_guy |
Here we are talking about DDFI-3 and our experence is not the same as with -1 or -2. But inside of each one there is some serious math going on. It seems like with each revision it got a lot more refined and therefore a little more difficult to understand and tune. But about your question on how long it takes the ECM to learn, it all seems to depend on how far out the 02 voltage is. On all types, there is a safety algorithm that immediately corrects for obscenely lean conditions, skewing the AFV up into the 140+ range. On the other hand in closed loop learn it reads how far out it is and corrects accordingly. The closer it is the longer it takes to make smaller changes to the AFV. So when trouble shooting a bike with something inside + or - 5, resetting the AFV back to 100% simply undoes the self correction. Just remember AFV corrections are global. Something too rich in closed loop learn driving a correction below 90% is also removing that same amount of fuel from the top. On the -1 and -2 systems with only one 02 sensor reading the rear, but controlling both can sometimes cause a lean misfire on the front cylinders. Too bad we will not get to see a lot of the new DDFI-3 systems as they were planned to on all the 2010 bikes. We will have to learn one bike at a time from the 1125's only. Hope this helps, Terry www.jtspeformance.com |
