Disconnect O2 sensors. - Victory Forums - Victory Motorcycle Forum
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post #1 of 55 (permalink) Old 05-26-2012, 01:15 PM Thread Starter
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Default Disconnect O2 sensors.

Did the O2 sensor thing. Diffidently made a power difference was worth the time to do. Now it will be nice if it does not hurt the fuel mileage or it would be great if it actually improves it which would not surprise me since it seems to run better. Anybody see an improvement on MPG doing this? Would love the PCV, but this is much cheaper for now.
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post #2 of 55 (permalink) Old 05-27-2012, 12:17 AM Thread Starter
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Default Seen other post.

Sorry after posting the above about the O2 sensors I see tonight that there is actually another thread on this. Still any MPG figures of before and after?
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post #3 of 55 (permalink) Old 05-29-2012, 07:14 PM
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Generally you'll see a 2 or 3 mpg loss since the ECU sends the injectors into open loop. That's not a bad thing. The bikes are tuned from the factory to run a bit lean to comply with EPA standards. If you were to add a PCV or a VFCIII you would have to disconnect the sensors anyway. Save up your pennies like I did and get a fuel controller and better exhaust.

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post #4 of 55 (permalink) Old 05-30-2012, 10:32 AM
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i ran a tank through last sat and got 42.my calculation, not
the bikes. thats 2 up riding. thats about what i was getting
before. didnt really notice any difference in power or smoothness.
hooked backed up sunday and havent run a full tank yet.
it has been between40 and 44 since new and a lot of it has
been windy days. done as good mileage wise as my 1300 vtx.

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post #5 of 55 (permalink) Old 05-30-2012, 12:22 PM
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Quote:
Originally Posted by irv View Post
i ran a tank through last sat and got 42.my calculation, not
the bikes. thats 2 up riding. thats about what i was getting
before. didnt really notice any difference in power or smoothness.
hooked backed up sunday and havent run a full tank yet.
it has been between40 and 44 since new and a lot of it has
been windy days. done as good mileage wise as my 1300 vtx.
The only thing I noticed was a loss in mileage, but all bikes I've owned seem to get worse mileage in the cold so that may have had something to do with it too. I didn't check the mileage, but I was getting the fuel light to come on between 155 and 165 miles as opposed to 195 miles before I disconnected them.

I also have the Stage 1 FI map. Maybe disconnecting them when running the stock FI map has more of an effect?

From what I've read on these systems is they all run a baseline open loop map. The sensors are just there to make minor adjustments to the baseline open loop map based on the oxygen level in the exhaust. Thus, if the sensors were to fail, the bike doesn't run much differently.

Supposedly, if "both" sensors fail (or become unhooked), Vic's FI systems electronically jump to some richer open loop map. Not sure what happens if only one fails.

I've read that conditions that cause the catalytic converter to over oxidize the HC and CO in the exhaust cause heat that damages it. This would indicate a lean condition (more air to fuel). The common net wisdom is that they are damaged by rich conditions however. Our forum tech Kevin says that the majority of damaged cats he's seen have been from running lean.




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post #6 of 55 (permalink) Old 05-31-2012, 12:19 AM Thread Starter
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Default Mileage?

Have not got to run a complete tank of gas yet since I unhooked them. It did make my bike run much better. To me it has always been lean. With them hooked up the bike did not feel comfortable running below 75mph in sixth gear. Now it can run much below 75mph in sixth gear and feels fine. I even took it down to 60mph in sixth gear and it would accelerate much easier than before.
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post #7 of 55 (permalink) Old 05-31-2012, 06:57 AM
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everyone talks about not using sixth gear till 70.on the
flat my bike does fine at 55 or 60 . i dont lug it but
on a smooth flat road and 2000 rpm and over 1700 cc's
i cant see that im hurting anything. maybe thats why im
happy with the mileage. i guess you can say im a conservative
rider. and its always 2 up.
feel free to cuss me me out about any of the above.--irv
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forged bars,bag bars,tach,driver and pass backrest[vic]
vic luggage rack and lowers,iso grips,2" pullbacks
hard bags,xc adj pass footrests, color keyed side
chin fairings. 7 jurock custom made windshield.
ultimate seat, hid low beams, timing wheel back in,
and of course, a ric z laydown license bracket.[5
mph faster].
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post #8 of 55 (permalink) Old 05-31-2012, 02:00 PM
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May be a dumb question, but since I haven't looked closely at them yet, was wondering how do you disconnect the O2 sensors?

Are they snap on type connectors or threaded or what?

Thanks,
Randy

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post #9 of 55 (permalink) Old 05-31-2012, 02:05 PM
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Quote:
Originally Posted by RMH View Post
May be a dumb question, but since I haven't looked closely at them yet, was wondering how do you disconnect the O2 sensors?

Are they snap on type connectors or threaded or what?

Thanks,
Randy
Yes, the connectors just snap apart, but I would strongly suggest taping them over to keep water from getting inside and corroding the contacts. Just in case someday you might want the improved mileage or need to take it in to the shop for a warranty repair. How you will explain to your mechanic why the ECU shows they've been missing up to the day you took it in for service is something you may want to consider in advance.




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post #10 of 55 (permalink) Old 06-01-2012, 12:34 AM Thread Starter
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Default Harley & O2?

Does anybody know if you can get the same results on the newer Harleys by disconnecting the O2 sensors. I had told a friend at work about it and he said he was going to try it on his Harley. This guy would also like to try the Victorys, he really likes the looks and said a while back he has thought of getting one. Maybe we can get him to do a demo ride someday, most of us know what happens then.
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