|Posted on Wednesday, January 05, 2011 - 07:50 pm: ||
I am just looking for some info
what is your afv and what altitude are you at i am 85.4afv at 5200
|Posted on Friday, January 07, 2011 - 10:54 am: ||
I'm at sea level and my AFV varies between 95-105 over the entire riding season. It stays at 100 most of the time.
|Posted on Friday, January 07, 2011 - 07:31 pm: ||
afv will very... you want a 10 point avg at same the altitude. this is due to the weather and physics of the engine and combustion process with the different densities of air, temp,and moisture as well as fuel combustion (IE ebr pumgas ecm's and race gas ecms. same bike same pipe different fuel= different map). This is the fluctuation you see.
The afv is a global fuel value of the entire range on the fuel map. It does not matter if its 60 or 150. Thats a complete change to bring the entire map to stioch or 14.7 avg. this afv number should be the same +- 10 at same altitude at same rpm. if you change rpms at same altitude and the afv jumps up or down at that rpm you have a bad area in the fuel map. EX. 3000 rpm=afv100 2500=afv98 3500=afv112 4000=afv102
The afv 112 lets you know that at 3500 your bike is asking for more fuel. The key to the best map is balance over time and load. something you cant do on a standard dyno very well at all.
To check your bike ride holding steady rpm 5 miles check afv. write down
move to the next rpm (center of rpm labels in your eeprom map heading)write down
Do this a few times and you will know if your map is good. If the afv is within 5 of the cell beside it your good. if it is with in lowest afv and highest of 10 you are good. adjust all holes to either bring up or down afv.
next issue is balance between cylinders.
afv needs to be the same between them
if one cell is spot on 14.7 rear but the front is lean at 15.6 you will get less power and slight bucking feeling.
The more rich the fuel to 13.2 NA afr gasoline the closer the balance must be or you get bucking imbalance feeling. If you set both cylinders the same at rich or really lean it runs at a different power level but smooth. the only way to set the front is to add a front o2.
How to on xb's have a muffler shop or yourself weld on a bung. I prefer inside across the front of the engine slightly tilted up. install fresh O2. run wire to O2 plug on the harness.
unplug rear O2. plug in front O2
do all checks as in previous areas. make sure the afv results match.
you can use ego settings as well.
Or datalog to adjust till the values are with in 5 to 10 max on the changes per cylinder.
thats all you need.
Gasoline Burns most Hp at 13.2. Some post and its hype that 12.6.is best. With ram air and turbo;s you run more fuel due to pressure. Natural (normally aspirated or NA) air it's 13.2.
Hope that helps.
Their is not a simple Fx(formula) to altitude/afv,their are to many variables.
bike condition, valve wear,intake build up how well the rings are seated, plug wear and gap, fuel type and quality,weather conditions and more. see why sensors are needed in FI. injectors cant adjust to the atmosphere like carbs. but carbs cant be refined as well as injectors.
wow I'll stop now.
|Posted on Saturday, January 08, 2011 - 02:44 pm: ||
I get all what you are talking about i have tuned(certified) a lot of bikes most on a dynojet 250i not alot of buells i was just trying to see an average (i know that the buell system is not hd system just so you know i know) you gave a lot of good info but not what you bike is running for afv and altitude