Fuel management systems.
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1st Gear
Joined: May 2023
Posts: 5
Likes: 1
From: WV
Fuel management systems.
I put a set of VH Staggered Big Shots and a K and N high flow air filter on my 2009 FLSTCI. Runs great, no muddy accel, no backfires, etc. I noticed it's running hotter and I'm getting a little decel popping. Researched fixes. Likely the factory 14.7 AFR is too lean causing both problems. ViED and XiED will only correct to 14.0 at best ( might help the heat issue, might not). I'm considering FP3 (FP4 not compatible with 2009) but after reviewing the AFR charts (which dip into AFR 12-ish range). I'm wondering how can FP3 work with OEM narrow band O2 sensors which only srnse from 14 to 15. Is FP3 a scam? They say you don't have to have wideband sensors for FP3 but how can it work if the NB sensor only senses 14-15? Interested in your opinion, experience and some advice.
Tourer
Joined: Jun 2021
Posts: 423
Likes: 51
From: Central Illinois
Can't recommend power vision enough.the Auto tune feature is outstanding and will correct any AFR problems you have now and for future mods. Read all the FP3 problem threads there must be a hundred
Road Master
Joined: Feb 2014
Posts: 804
Likes: 237
From: TN
Ok so closed loop switches to open loop at .976 lambda or 14.3 afr. What size sensors do you have in the bike. 2009 I believe are the larger sensors which have more range. But to tune it properly you need something like a power vision, tts or similar full range tuner. Give Fuel Moto a call, sticker shock on the PV3b. It used to be a lot less till all the shortages came about.
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