| Author | Message | ||
     Carbonbigfoot |
Just slapped it back on tonight. My AFV's are at 105 with it off, and if I'm thinking right, it will richen it up a bit until it learns, and should return to 100%. We'll see what my SOTP Dyno says... R | ||
| Adoogie3 |
I think my homemade k&n and air box off was the cheapest and best mod yet | ||
| Gearhead571 |
Carbonbigfoot what do you use to access your afv values. Do you have a scan tool or is there a way to do it through the instrument cluster | ||
| Bigschwerm |
Gearhead571 you can access them through your instrument cluster in diagnostic mode Hold down your Mode and Toggle buttons and turn your ignition on....it will enter into diag. mode and from there you can scroll through and find them..... | ||
| Gearhead571 |
Thanks. Harley uses a similar procedure. Very nice of them to allow us access to dtc's and other diagnostic info that would otherwise require the use of an expensive scan tool. | ||
| Marcodesade |
As a complete n00b, could I request someone post detailed "background" on this subject? I hate to give you too much to laugh about, but some of my questions are: 1. What are AFV's? 2. If Carbonbigfoot hit 105 with the airbox off, what is a typical number with it on --- and what is desirable? 3. If everyone likes the airbox off (or modified, as I've read in other threads) why did he put his back on? 4. Other than curiosity, is there a legitimate reason for a n00b to look up the AFV values? Hate to expose myself as a know-nothing, but I read this stuff to learn more. Thanks, Marco | ||
| Boltrider |
1. AFV = Adaptive Fuel Value. It's expressed as a percentage of fuel being fed to the motor. 100 is the baseline, so 105 means that one (or both) cylinders are getting a 5% fuel enrichment. If it were 95, then the cylinder would be getting 5% less. It's part of the ECM's learning capability. 2. I'm gonna guess and say between 95-105. 3. He's probably just experimenting. 4. Yes - if your AFV's are too high or too low, that could indicate a problem with the bike. (Message edited by boltrider on February 12, 2009) | ||
| Carbonbigfoot |
Marco! Welcome.... A. I have had a couple of glasses of wine, so take this for what it's worth! 1. AFV= Air Fuel Value 2.Ideally, from the factory the AFV should be 100. 105 means that the computer on the bike is adding 5% more fuel to bring the mixture in line with what the computer thinks is "right". This by many peoples observation takes about 200 or so miles for the computer to adjust to any changes in the system. When I removed the inner airbox, it reduced the resistance in the intake, and let more air in. Eventually the computer said to itself, "Hey, I need more fuel!" so it bumped it up to 105. 3. The reason I pulled it off is that it sounds like the hounds of Hell are about to suck you into the engine when you go to WOT. The reason I put it back on, is that I had the seat off to mess with the suspension and have been thinking about the fuel enrichening thing for a while now. Just f***ing around to be perfectly honest.... Try pulling it off to see if you like the way it sounds. I LOVE it. When I get my Drummer, I am going to have it open in and out, and look forward to scaring little old ladies and small children whenever the opportunity arises! 4. Who says curiosity isn't a legitimate reason to do anything??? Rock on with your bad self!!!! Welcome to the asylum. Rob | ||
| Marcodesade |
Wow, thanks for the lesson guys! I have learned SO much by admitting I'm ignorant (and it beats the hell out of the flames I get when I pretend to know anything). As it turns out, I've been thinking about sound, and what I'm looking for is kind of a moderate nastying of the output. Everyone talks about how loud the Jardine, Drummer, D&D, and Remus solutions are, and while I'd like to sound a little less like a moped, I'm not really interested in pissing off my neighbors (or the local gendarmes). And I have no plans to compete, so really the bike already has more performance than I have any business pushing. So here is my next round of questions: 1. Is airbox off (all by itself) going to get me ticketed or my house egged? 2. Is there anything I need to know about doing it --- and is there any other work that needs to accompany it? 3, And finally, does removing it place my warranty in any jeopardy or subject the bike to any other mechanical risk? Thanks again, Marco | ||
| Zack3g |
no, no, and no. however, i went one step further and replaced the stock outer airbox cover with the one off of my ulysses, adding an additional intake point. ...also provided another place for the noise to escape thus making it even louder  | ||
| Adoogie3 |
I prefer mine off. The first time I took the woman for a ride she looked at me and said what did you do this thing it sounds great !! | ||
| Marcodesade |
Kewl. It comes off this weekend. I also noticed the Uly wasn't closed, but I'm not ready to invest the coin there just yet (still need a double-bubble and a tail tidy). Thanks again for the schoolin'! | ||
| Zac4mac |
I ran mine without for a couple of months. My mpg dropped a bunch. I think it was from honkin the throttle so much more. It sounds so cool I couldn't leave it alone. Put the inner back on and I'm at 40 mpg. Besides it's got Eriks signature on it, protected by the Clear orange top-box. Z | ||
| Carbonbigfoot |
Best part about it, the only cost is about 15 minutes of your time! And it is 100% reversible if you want to put it back to stock. *************************** UPDATE *************************** Same or maybe a bit less on the power, but it seems to run smoother. Could be completely subjective, no data to support anything. Anybody thought about doing a "lite" version of programming that just changes the AVF, thereby (IF I understand it correctly) adding a little bit of fuel everywhere? Not an elegant solution, but not as complex as the sniffers/dyno/etc way. Thoughts? R | ||
| Cataract2 |
What about if you drilled the airbox? | ||
| Carbonbigfoot |
Progressively more noise, as you drilled more. Not as applicable on the 1125's cause the airbox does NOT hold the filter in place like on the XB's. You can remove the whole thing, and it does not effect the sealing of the filter. And drilled holes are a lot more permanent. R | ||
| Cataract2 |
True, but kinda wondering if that would allow us to keep some of what the airbox does without changing to much. Maybe getting a bit more air in there at normal speeds. Just thinking. | ||
| Carbonbigfoot |
There have been those that have proposed some kind of trap-door arangement that will hold pressure from the ram air at speed, but open wide under vacuum at lower speeds. Not sure how much gain you would experience for the complexity. Neat concept, tho! R | ||
| Redscuell |
I've heavily 'skeletonised' my airbox (that's what the BMC parts manual calls the inner one; the outer has another name, I think 'cover'). The entire top of the airbox is cut out leaving the half-pipe that the petrol overflow hose fits into; and for looks alone I've drilled the remainder with 1/4" holes (my XB cover is clear blue, see my profile pic, which doesn't have the airbox fitted at all). I'd post pics, except every time I try, even with 65kb files, they seem to still be too big. Anyway, the airbox fits into the cover so tightly, as is visually apparent through the clear XB cover, that I expect a lot of the ram-air effect remains when the airbox is skeletonised by keeping the outer edges sealed to the lower airbox. There are HUGE gaps around the perimeter of the cover-to-frame interface when the airbox is removed (again clearly visible through the clear XB cover), so I reckon that's where all the noise is emanating from, rather from eliminating the double-layer over the air filter. That's an educated observation, not a guess, because my first 'surgery' to the airbox was to remove only the top of the airbox in large lung-shapes, and the sound was still extremely quiet even with the XB cover's extra air inlet. I'm including so much explanation because some posters post replies that indicate they think I'm simply speculating, rather than informing based on knowledge!  | ||
| Marcodesade |
Last question (for now): I have the leatherette airbox mask. It attaches to the inside of the airbox cover with velcro. Do you think I'll still be able to use it with the inner airbox out? | ||
| Carbonbigfoot |
Yeah, Don't see why not. R | ||
| Marcodesade |
OK, I'm about to crack it open, and as I read the manual, I see the vent hose which is ordinarily seated in the airbox. What happens to the hose? Do I just leave it hanging there? Or does it need to be secured somewhere? | ||
| Marcodesade |
Hm. Don't mean to kick a dead horse, but can someone tell me what to do with the vent hose when I remove the airbox? | ||
| Xbswede |
Run it along the base plate and use some zip ties. | ||
| Marcodesade |
Thanks! | ||
| Hooliagn |
Does anybody know how much the inner airbox cost ? | ||
| Xbswede |
"Just slapped it back on tonight. My AFV's are at 105 with it off, and if I'm thinking right, it will richen it up a bit until it learns, and should return to 100%." So what is reading Now with the air box back on? | ||
| Racerxusa |
Hooligan or others: Airbox cover part no. P0215.1AM, $38.99 MSRP. Not bad prioe. Air filter is already 19.95 or so. While im on here how does removing or disconnecting the intake solenoid work on an 09 1125R/CR? I know this has been discuossed b4 but since I have a 1125CR and have jardine/dobeck tuning im testing for them and awaiting the first K&N air filter. I want to know if removing airbox cover...and intake solenoid works good with 09 models and exhaust/tuning mods...I will try soon. Thanks for your info/suggestions... Rob Kreiner Buell Specialist 951 785-0100 | ||
| Hooliagn |
thanx | ||
| Bigschwerm |
Rob the solenoid removal was the first thing i did after i got my bike home i hit the dead spot driving home from the dealer and was not fun trying to pass...also i have ran the airbox cover off and on i think in the lower rpm's it felt a little more peppy in the upper rpm's cant really tell the difference ripping on it.I would like to see some before and after air box cover off with the K&N (im running a modded K&N on mine ever since 50 miles) Good luck with the tuning and thanks for all the feedback! Tell Chris im waiting for him to release that unit!  | ||
| Pridayr |
AFV's still at 105 front and rear. Maybe it hasn't learned yet? Only been 100-150 miles... Rob (CarbonBigfoot) |
