Air Fuel Ratio Question
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Stellar HDF Member
Joined: Aug 2013
Posts: 3,428
Likes: 3,576
From: Texas
Air Fuel Ratio Question
When I first got this 1996 FLHTCU-I Ultra Classic, (EV27 cam, Screaming Eagle air cleaner, 97/98 ECM, Supertrap mufflers), it was running rich, especially when cruising on the interstate, 70/75 mph, so I got a map that closely match my engine, but it was lean, a lot of decel popping. I got a AEM wideband air fuel gauge, I installed AF sensor on the right side, just behind the Y were the front and rear exhaust pipes come together, since then I have worked on getting the A/F ratio as close to 14.7 as I can while cruising, mid 13s when accelerating, and mid 12s when wide open throttle. I am adding 1% fuel to the rear cylinder. When I first start it, it idles at 13.5 AF, when it warms up, it idles at 17.5 AF, when I try to add more fuel to the 0 throttle, 1000 rpms, it idles like crap, the bike shakes, I know that 17.5 is lean but don't think that it will do any damage at idle.
Does anyone have any thoughts or suggestions.
Does anyone have any thoughts or suggestions.
Last edited by RLH3175; Sep 28, 2014 at 04:57 PM.
Tourer
Joined: Sep 2014
Posts: 369
Likes: 31
From: Marlton, NJ
Keep in mind Lean is hot. IMHO 14.7 (stoich) is hot. However, not to hot as in causing damage even at a 17. My only concern with a 17 at idle would be the heat idling for any long period of time.
At what point does your idle improve as you start to richen it up? What is your Afr on decel?
At what point does your idle improve as you start to richen it up? What is your Afr on decel?
Road Master
Joined: May 2014
Posts: 827
Likes: 59
From: Canada
Thanks.
I've installed one in my old car and it provides a lot of good info IMO.
I think I'll put it on the list of things to do for the bike.
Have you got that bung installed in a band clamp?
I've installed one in my old car and it provides a lot of good info IMO.
I think I'll put it on the list of things to do for the bike.
Have you got that bung installed in a band clamp?
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Stellar HDF Member
Joined: Aug 2013
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From: Texas
I did get the band clamp, didn't want to get hung up trying to get someone to weld in the bung, wanted to remove the exhaust, drill the hole, and put it right back on.
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