Throttle % when O2 Sensor Not Used? - Victory Forums - Victory Motorcycle Forum
 
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post #1 of 4 (permalink) Old 02-25-2018, 01:17 AM Thread Starter
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Default Throttle % when O2 Sensor Not Used?

For the Vic 106 motors that still use the stock oxygen (Lambda) sensor for closed loop modes, e.g., unmodified bikes with O2 sensor still plugged in, what is the percent throttle when the ECM no longer uses the the closed loop tables and switches to open loop (aka Wide Open Throttle) tables?


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post #2 of 4 (permalink) Old 02-25-2018, 05:35 AM
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What will you do with this information and how will you determine throttle % you are holding?

The loop closes at steady-state cruise. Throttle percentage I have no idea and not sure if closed loop is even relying on a % at all.

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post #3 of 4 (permalink) Old 02-25-2018, 10:59 PM Thread Starter
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I ask for tuner research reasons; compiling pros and cons for each that I find.

I suspect you may be correct in that the Vic ECM does not directly take into account throttle position for fuel and ignition, but more like throttle change rate.

I am familiar with MAF tuning with additional wideband oxygen sensors, did it with HP Tuners on my ‘98 small block when I bored and stroked it, but I’m not that familiar with speed density tuning and how a narrow band only system can be used under WOT (or near) conditions to get max power.


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Last edited by Chuckz71; 03-23-2018 at 01:35 PM.
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post #4 of 4 (permalink) Old 02-26-2018, 11:56 AM
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That's an interesting question. Last year I rode my 13 CCT to the Columbia River bordering Oregon and Washing and as usually happens every stinking year I take my big trip that 2 weeks is always a heat wave! 20 degrees above normal. Never fails.

Anyway I run the timing wheel at 6 degrees and it's never pinged. This trip however I notice that the speed of how fast I opened the throttle would cause a little moment of ping. If I rolled it on slower (from cruise to 3/4 in about a second. Counting "one thousand one") it wouldn't ping. But snap it open quickly and I got a short moment of ping.

I started thinking if the Victory throttle bodies have a accelerator pump setting that could be enriched to stop the snap open to wide throttle ping?

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