Tuners and narrow band O2 sensors
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Tourer
Joined: Apr 2013
Posts: 432
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From: Savage
Tuners and narrow band O2 sensors
When a bike is tuned using a PV, Screamin' Eagle, etc, what role do the narrow band O2 sensors play after the tune is done? I assume that their range is too small to be of use like the wide band sensors for Auto-Tune? For most tunes wouldn't they read too low? I've read different manuals, but I've never found an answer.
Cruiser
Joined: Jul 2007
Posts: 179
Likes: 3
From: Ocean View, DE
When a bike is tuned using a PV, Screamin' Eagle, etc, what role do the narrow band O2 sensors play after the tune is done? I assume that their range is too small to be of use like the wide band sensors for Auto-Tune? For most tunes wouldn't they read too low? I've read different manuals, but I've never found an answer.
I have had a PV on my bike since putting 255 cams in last winter. I have used the FuelMoto canned map since then. This past wek, I just did get around to doing this "autotune" to the VE tables. It appears my gas mileage has gone up about 4-6 mpg as a result and throttle response seems a bit smoother.
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
When a bike is tuned using a PV, Screamin' Eagle, etc, what role do the narrow band O2 sensors play after the tune is done? I assume that their range is too small to be of use like the wide band sensors for Auto-Tune? For most tunes wouldn't they read too low? I've read different manuals, but I've never found an answer.
They are used after the tune to run closed loop tunes. You can't run closed loop without O2 sensors. Closed loop tunes provide good drivability and fuel economy for most people.
If you are using the factory O2 sensors with Auto Tune when you enter AT Basic mode the Power Vision sets the Lambda/AF targets near stoich (among other temporary edits) to allow the sensors to populate correction data within their useful range. When you then export the corrections and create a new map the Lambda/AF values revert back to the original target. Essentially once the ECM knows the specific airflow model (VE) it is able to mathematically calculate and deliver the desired AF. During normal operation (not Auto Tune mode) the factory O2 sensors are used in closed loop for adaptive fuel control. Hope this info helps
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Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
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