| Author | Message | ||
     Dktechguy112 |
I have an 09 cr with the cali can. I removed the inner airbox cover and noticed the afv's dropped, they went to 89.5 front and 94 rear. I put the inner cover back on and rode the bike for about 200 miles and the afv's are at 89.5 front and 100 rear. Is this normal? From what i understand, the cali can vents to the front cylinder, so does it effect the front cylinder's afv value? | ||
| Red93stang |
Mine are the same as urs. I have been wondering the same thing. I have the Cali Can also. Normal? | ||
| Ratsmc |
What are you concerned is not normal? the difference between the cylinders or the range that they are in? | ||
| Red93stang |
I figured their would be a little difference, but it seems to be pretty lean on the front cylinder. | ||
| Dktechguy112 |
i am not very familar with AFV's, from what i have read on this board, they should be at 100 front and rear. I noticed that my front is at 89.5, and I am fairly certain that the difference is due to the cali can, i am just curious why the afv is 89.5 on the front, and if this means the front cylinder is running lean. Its good to know that there are other that have the same afv's as me. | ||
| Ratsmc |
The AFV don't actually indicate whether a cylinder is running lean, rather it is telling you what the ECM is doing to get the fuel ratio to what it is supposed to supply. Having differing values isn't an issue unless it becomes a huge gap. The Cali can should't be playing enough of a factor to change the values very much since the can is supposed to actually capture and store fuel vapors. | ||
| Red93stang |
Capture and store? It has to reburn fuel vapor that the carbon canister can't take care of right? Otherwise their would be no reason for the vac line to the t body. Anyone from Cali checked their avf's? | ||
| Ratsmc |
Even if the can just fed the vapors directly into the motor it still shouldn't be enough to affect the AFV by very much at if at all. I think you'll find that there is a wide range of AFV values and you will find many 49 state 1125s that are the same as yours. Since I have a 49 state bike and haven't installed the can, I am just assuming that it is just like the vapor canister on cars that is basically just a can of charcoal that absorbs vapors. If this is the case, the amount of gas being fed back to the motor through the canister is going to be zero or very minuscule. | ||
| Dktechguy112 |
How about people post up their afv values? Mine: Stock 2009 1125CR Cali edition, cali can, cat converter without inner airbox cover: front-89.5 rear-94 with inner airbox cover: front-89.5 rear-100 | ||
| Red93stang |
Thank u Dkt. Mine is a 49 state bike with a Cali can. I think their is enough fuel vapor recycled into the front tbody that the ECM tries to lean out the front cylinder to comp. Front 89.5 Rear 99.5 | ||
| Dktechguy112 |
red93stang, It has been very hot in cali, and i have noticed the fuel boiling a few times, and a lot of fumes must be venting because it stinks up the garage, so i am sure that it is putting a good amount of fuel in that front cylinder like you are saying. Good to know i'm not the only one with this problem, and i guess its not really a problem. | ||
| Ratsmc |
Quick question: what were your AFVs before the Cali can? | ||
| Red93stang |
Front was 100 Rear was 101 I have a buddy with a CR, 49 state bike, no mods. We live in the same area and his are 105 front and rear. | ||
| Ratsmc |
Are you running the stock exhaust? | ||
| Red93stang |
Bike is stock as a rock, denoided, and Cali can, only two mods done. | ||
| Dktechguy112 |
mine is stock as well, denoid, and mine is a cali bike, so cali can and cat converter. | ||
| Xoptimizedrsx |
Red there you go you pointed out a big thing many do not see. stock bike to stock bike avf. one bike has 105 the other much lower. same ecm data. This proves once again one map does not fit all bikes and each will run differently. Imagine going to different places. The problem with afv: to many people are concerned about being at 100 when what they need to be concerned with is balance. when I say balance I mean balance in that cylinder not between two cylinders completely. I'll get to that in a second. First get the afv from a rpm zone. then ride differently in a different zone and get that afv. do this to check afv ratio's in a few places. If your still checking the front cylinder and you was riding 20 to 30 mph and had a 110 afv you better carry the same afv thought all tps positions in that map, speeds and rpm. what I see mostly is afv checking to see its target which is global, but when checked later in a different rpm zone it would have a big gap. this is moving the whole table to match that area hence messing up the other area again. whereas the afv will have to relearn as it is constantly doing but the ecm is off in fueling until it updates each cycle. This is making the ecm work to much. Therefore you have to get the afv balanced from zero rpm to WOT. once mastered (simply done) move to the other cylinder. re-pete the whole cycle process. An afv difference up to 10 is just fine between cylinders but not in a single cylinder. In the single cylinder afv must be stable (same number thought). now you have both cylinders balanced time to move on. say you want to race... you will need to know the afr. since you are balanced already its simple to correct. change the O2 set-point. ((beware the NB is sensitive on accuracy so dont get to crazy on the changes. if you want full movement use a LC1 type unit and feed the simulated NB line to the ecm using standard NB settings since the ecm is programed to these type settings) (saves you time and learning new things to do in the ecm)) a few steps up on NB will raise the afv a few points getting the entire map more rich more fuel. but you need to know your target afr. which factory values will be 14.7. your goal is 13.0/13.2. note: race spark plugs on std pump fuel(93) will be light brown when pulled at 13.2 afr. |
