Optimum AFR
Thread Starter
|
Tourer
Joined: Apr 2007
Posts: 395
Likes: 11
From: Oklahoma
Optimum AFR
I have read back threads and such related to the PCV/AT, but most are relatively old. What would be considered as the optimum AFR on the new, 2012, 103's? Both at cruise and at WOT?
The particular set up would be engine stock, decatted, stock head pipes, slip on VH MR's, AN big sucker stage 1.
Thanks.
The particular set up would be engine stock, decatted, stock head pipes, slip on VH MR's, AN big sucker stage 1.
Thanks.
Road Captain
Joined: Jan 2009
Posts: 739
Likes: 2
From: St. Louis
I'd shoot for 14 to 14.2:1 in the cruise range. Some people like it leaner for better fuel economy, I like it as a good compromise A/F ratio. Full throttle you want to be right at 13:1 for maximum power production. Each bike is different, but these are good numbers to get you started. Also, going from the cruise A/F ratio to larger throttle openings (40 - 80 %) you want the A/F ratio to ramp up, not go from 14:1 directly to 13:1. It makes for a smoother transition.
Road Master
Joined: May 2010
Posts: 1,005
Likes: 4
From: Alabama
Bet your question will get opinions from all over the rich/lean spectrum.
My PC-V w/AutoTune is setup for 13:1 @ 60% to 100% throttle and 13.8 in the cruise ranges. Tapering the A/F ratio between the two.
Have played around with leaner mixtures in the cruise range but 13.8:1 seems to run a little cooler and has great throttle response. Spark plugs look great at 13.8, that light tan color that you like to see. Leaner than 14.2 and they start to look white.
The bike gets 36-38 mpg cruising. I might get better but its hard not to rip on it every now and then. I just can't help it. LOL.
My PC-V w/AutoTune is setup for 13:1 @ 60% to 100% throttle and 13.8 in the cruise ranges. Tapering the A/F ratio between the two.
Have played around with leaner mixtures in the cruise range but 13.8:1 seems to run a little cooler and has great throttle response. Spark plugs look great at 13.8, that light tan color that you like to see. Leaner than 14.2 and they start to look white.
The bike gets 36-38 mpg cruising. I might get better but its hard not to rip on it every now and then. I just can't help it. LOL.
Last edited by 2004Sierra; Nov 5, 2012 at 04:19 PM.
Outstanding HDF Member
Joined: Jul 2010
Posts: 2,727
Likes: 6
Here is a copy of mine. I have a few of them, but this is what I use most of the time. Sorry, I couldn't post a picture.
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.7 13.9 13.4
13.6 13.7 13.7 13.7 13.7 13.7 13.6 13.6 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.7 13.9 13.4
13.6 13.7 13.7 13.7 13.7 13.7 13.6 13.6 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
Thread Starter
|
Tourer
Joined: Apr 2007
Posts: 395
Likes: 11
From: Oklahoma
Here is a copy of mine. I have a few of them, but this is what I use most of the time. Sorry, I couldn't post a picture.
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.7 13.9 13.4
13.6 13.7 13.7 13.7 13.7 13.7 13.6 13.6 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.8 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.1 13.4
13.6 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.9 13.7 13.9 13.4
13.6 13.7 13.7 13.7 13.7 13.7 13.6 13.6 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
13.4 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.6
Outstanding HDF Member
Joined: May 2008
Posts: 2,543
Likes: 19
From: Ashland Ohio
Bet your question will get opinions from all over the rich/lean spectrum.
My PC-V w/AutoTune is setup for 13:1 @ 60% to 100% throttle and 13.8 in the cruise ranges. Tapering the A/F ratio between the two.
Have played around with leaner mixtures in the cruise range but 13.8:1 seems to run a little cooler and has great throttle response. Spark plugs look great at 13.8, that light tan color that you like to see. Leaner than 14.2 and they start to look white.
The bike gets 36-38 mpg cruising. I might get better but its hard not to rip on it every now and then. I just can't help it. LOL.
My PC-V w/AutoTune is setup for 13:1 @ 60% to 100% throttle and 13.8 in the cruise ranges. Tapering the A/F ratio between the two.
Have played around with leaner mixtures in the cruise range but 13.8:1 seems to run a little cooler and has great throttle response. Spark plugs look great at 13.8, that light tan color that you like to see. Leaner than 14.2 and they start to look white.
The bike gets 36-38 mpg cruising. I might get better but its hard not to rip on it every now and then. I just can't help it. LOL.
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
Likes: 31
From: earth
Optimum to achieve what goal? There aren't just two AFRs to concern with at cruise and WOT, AFR values transition across the entire map, accel and decel values also.
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Road Master
Joined: May 2010
Posts: 1,005
Likes: 4
From: Alabama
All the Fuel Moto tunes I have received have been at 13.8:1 in the cruise range. I guess they set them up on the very rich side.
Last edited by 2004Sierra; Nov 5, 2012 at 10:49 PM.
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Outstanding HDF Member
Joined: May 2008
Posts: 2,543
Likes: 19
From: Ashland Ohio
You run a PC, so you NEED that extra fuel. If you ran a flash tuner and kept the O2s intact, like a TTS or a PV, you could easily run 14.2-4.
Speaking of Nascar... what is THEIR nominal WOT/Cruise set at? 19? 17.5? This is the year of EFI, if they run unleaded, there is NO way they are reading the AFR on those plugs. Timing, etc. yes, ping, yes, but pure white is pure white at 19:1 AFR. even down in the base.
I grew up reading plugs, too. But since leaded went away in 1980, things DO change a bit.
You won't 'buy' it, but you actually ARE running too rich for a 2010 bike IMHO, a bike that came with closed loop.
We're good, dude.
Speaking of Nascar... what is THEIR nominal WOT/Cruise set at? 19? 17.5? This is the year of EFI, if they run unleaded, there is NO way they are reading the AFR on those plugs. Timing, etc. yes, ping, yes, but pure white is pure white at 19:1 AFR. even down in the base.
I grew up reading plugs, too. But since leaded went away in 1980, things DO change a bit.
You won't 'buy' it, but you actually ARE running too rich for a 2010 bike IMHO, a bike that came with closed loop.
We're good, dude.
Last edited by wurk_truk; Nov 5, 2012 at 10:50 PM.
Road Master
Joined: May 2010
Posts: 1,005
Likes: 4
From: Alabama
You run a PC, so you NEED that extra fuel. If you ran a flash tuner and kept the O2s intact, like a TTS or a PV, you could easily run 14.2-4.
Speaking of Nascar... what is THEIR nominal WOT/Cruise set at? 19? 17.5? This is the year of EFI, if they run unleaded, there is NO way they are reading the AFR on those plugs. Timing, etc. yes, ping, yes, but pure white is pure white at 19:1 AFR. even down in the base.
I grew up reading plugs, too. But since leaded went away in 1980, things DO change a bit.
You won't 'buy' it, but you actually ARE running too rich for a 2010 bike IMHO, a bike that came with closed loop.
We're good, dude.
Speaking of Nascar... what is THEIR nominal WOT/Cruise set at? 19? 17.5? This is the year of EFI, if they run unleaded, there is NO way they are reading the AFR on those plugs. Timing, etc. yes, ping, yes, but pure white is pure white at 19:1 AFR. even down in the base.
I grew up reading plugs, too. But since leaded went away in 1980, things DO change a bit.
You won't 'buy' it, but you actually ARE running too rich for a 2010 bike IMHO, a bike that came with closed loop.
We're good, dude.
After thinking about my last post I thought it sounded a little argumentative. I edited the post and you responded while I was changing it. LOL.
I do have Bosch wide band O2 sensors on my bike. The PC-V is set up with AutoTune.
My bike really likes 13.8:1 in the cruise range. Running any leaner I can also feel the bike running hotter. Maybe it is rich, but the bike likes it.