V-Rod Exhaust
Novice
Joined: May 2008
Posts: 18
Likes: 0
From: ga
funny but the 08 can reset its own fuel mixture to a degree. i know you old school harley guys may say no but yes it can . thats why with the the pclll they removed the 02s because the ecm would recaliprate to factury lean setting and the pclll would try to set custom settings what a battle so they did the easy thing remove the 02s . now for high performance or engine modes the factory can not adjust enough . but just butting on pipes for sound no problem. some dealers will tell you the truth and some just dont know. just put on what they know will work. front and rear 02s are new for harley and they just havent leaned yet. my 08 has jug huggers with baffels and runs and sounds great. alot of riders could never make these pipes work. back presure and a ecm that can self adjust works fine . i have driven over 6000 on this system with no problem. i have even pulled a plug for good mesure looks great.
Tourer
Joined: Oct 2007
Posts: 331
Likes: 1
From:
funny but the 08 can reset its own fuel mixture to a degree. i know you old school harley guys may say no but yes it can . thats why with the the pclll they removed the 02s because the ecm would recaliprate to factury lean setting and the pclll would try to set custom settings what a battle so they did the easy thing remove the 02s . now for high performance or engine modes the factory can not adjust enough . but just butting on pipes for sound no problem. some dealers will tell you the truth and some just dont know. just put on what they know will work. front and rear 02s are new for harley and they just havent leaned yet. my 08 has jug huggers with baffels and runs and sounds great. alot of riders could never make these pipes work. back presure and a ecm that can self adjust works fine . i have driven over 6000 on this system with no problem. i have even pulled a plug for good mesure looks great.
The closed loop function on the current dephi efi units on these motorcycles does nothing for transient loads. The closed loop function is very limited to steady rpm cruising and idle conditions.
When you are accellerating or decelerating, the computer falls back onto the MAP programmed in the ECM to deliver fuel, and spark. If you are running an aftermarket pipe, air cleaner, etc, I would bet money you're not as safe as you think you are.
If you know anyone with a Twinscan II plus, I would be REALLY interested to see how your AFR's look under normal riding conditions. It would be easy to put on your bike, just unplug your O2 sensors, and plug in the wideband O2 sensors on the Twinscan II plus, plug it into power, and plug it into your Data BUS connector.
If you're anywhere in the Toledo Ohio area, I'd be happy to lend mine for this "project."
Novice
Joined: May 2008
Posts: 18
Likes: 0
From: ga
The dealership here is even at a loss . There are split some say no some yes lol . I was told by the service manager it should adjust enough but if it jurks or bucks they can upload a new map to help compancate . But still you dont need a pcIII . you might be right about excell and dexcell but mine puffs out black under a load witch tells me she pushing plenty of fuel out .
Thread Starter
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4th Gear
Joined: Aug 2008
Posts: 8
Likes: 0
The dealership here is even at a loss . There are split some say no some yes lol . I was told by the service manager it should adjust enough but if it jurks or bucks they can upload a new map to help compancate . But still you dont need a pcIII . you might be right about excell and dexcell but mine puffs out black under a load witch tells me she pushing plenty of fuel out .
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Tourer
Joined: Oct 2007
Posts: 331
Likes: 1
From:
Good to know. Thanks for the down low. Does the PCIII ex have the ability to "shift" the target AFR for the closed loop function?
