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Make Your Own O2 Sensor Eliminators


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#1 Trace

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Posted 12 April 2006 - 10:15 AM

Posted Image
Close-up of connectors

You can make your own Oxygen sensor eliminators by installing 330 ohm resisters across the leads to the OEM sensors. Locate the natural and the black colored 4p connectors near the alternator cover (left side) and dissconnect them both.

Posted Image
Location under left fairing

PARTS

330 ohm resisters at Radio Shack $0.99 a pack of 5

Model: 271-1315
Catalog #: 271-1315

INSTALL

Posted Image
Install the Resisters across the leads

The 4p connectos have 4 leads. Use the two leads opposite the locking tab on each of the black and natural connectors, obviously on the side connected to the bike and not to the O2 sensors. You can remove the sensors and their wire harnesses if you want. Plugs that fit where the sensors screw into the exhaust pipes are easily found at most any auto parts store.

You can wrap with electrical tape or find large shrink wrap to protect the wireing job, zip tie them secure.
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#2 DizzyDave

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Posted 12 April 2006 - 12:11 PM

Thanks for the 'how' to eliminate the O2 sensors...

What does it do for me? with a stock Vtec, no pipe or PCIII.

My guess is, it will prevent the bike from leaning itself out because it doesn't detect the rich mixture anymore.

#3 VFRquig

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Posted 12 April 2006 - 12:40 PM

Thanks for the 'how' to eliminate the O2 sensors...

What does it do for me?? with a stock Vtec, no pipe or PCIII.

My guess is, it will prevent the bike from leaning itself out because it doesn't detect the rich mixture anymore.

<{POST_SNAPBACK}>


I asked a similar question on another recent thread and am impatiently waiting for a response http://www.vfrdiscus...tyle_emoticons/default/smile.gif

Here it is again to add to Dave's question:

If the 99 headers have no cat and the resistors are plugged into the O2s, what does that do to the FI without a PCIII? Does the bike run richer overall, but without the Cat produces more hp? If one were to simply run eliminators on a bike with a Cat and no PCIII, what would happen, assuming no aftermarket pipes? More hp / hurt performance / nothing? Inquiring minds want to know! I really know very little about the intricacies of the FI system and have learned a lot from some of our more technical folks at VFRD. As always, I appreciate the info!! Thanks.

Edited by VFRquig, 12 April 2006 - 12:42 PM.


#4 HispanicSlammer

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Posted 12 April 2006 - 12:44 PM

It is thought that eliminating the o2 sensors cures that midrange surge or flat spot in the power-band. It is essential to eliminate the sensors when using a PCIII or you will get FI errors. Using an aftermarket silencer some have had success in curing the surging by eliminating the O2 sensors. When in constant throttle the ecm puts the fuel curve into stoichiometric mode and it burns with lower emissions, saves fuel, this seems to produce a flat spot or a surge when coming out of it.

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#5 VFRquig

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Posted 12 April 2006 - 01:17 PM

Thanks HS. I was looking for a bit more ed-u-ma-ca-shun on how it actually worked in terms of various throttle situations so I appreciate the help. If I understand this correctly, the O2 sensors "tell" the system to richen/lean mixture as needed depending on the readings before and after the Cat. So my question is, if the Cat is not there (ie 99 header pipe) and the sensors are eliminated, does the bike run leaner, regardless of throttle state (steady, WOT) or does the bike run richer? What actually controls the fuel/air mixture on the bikes, other than the stock map and O2 sensors? It seems the removal of the Cat would decrease the restriction enough to require a change in the mixture (assuming factory exhaust and no PC III). So, to complete my ramblings, if I were to get 99 headers, with no aftermarket pipes and no PC III for my Vtec, would I notice any positive or negative performance changes (hp) or will it simply be enough to address surging problems for those unlucky owners that have them?

#6 HispanicSlammer

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Posted 12 April 2006 - 01:30 PM

Map Sensor is what controls the fuel air mixture mostly, but it hands off to the O2 sensors when in open loop during those steady throttle sessions then it goes very lean into stoichometric, it think its 14 parts air 1 part fuel. Map sensor measures the manifold vacuum pressure which is what controls the fuel mix when tied with the throttle postion sensor - its a three dimensional map tp sensor vs map sensor air temp sensor in the airbox - it is when one of these variables is held constant that the O2 sensors is used, TP constant input for so many seconds loops in the o2 sensors.

It is an excorize in Boyle's law

PV=C

and adjusting for temperature

V=CT

The computer needs to know the volume of air at what pressure and temperature in the cyclinder to inject the right amount of fuel based on the throttle input at the time of the intake stroke.

It reads temperature from the temperature sensor and reads pressure with the map sensor, and then calculates the amount fuel - it is not 100% correct so there is not always an effiecient burn so when the throttle postion is held constant it can read the O2 sensor reading and inject stochometric fuel loads. Its of course more complicated than I explain but basically thats the idea.

"May the road rise to meet you." miguel@vfrdiscussion.com

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#7 Guest_Ikazuchi_*

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Posted 12 April 2006 - 01:34 PM

When I installed mine I ended up nipping off a little of each lead so that the resistor can sit right on the end of the connector. Makes for a little cleaner tape job. :D

#8 Trace

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Posted 12 April 2006 - 01:42 PM

When I installed mine I ended up nipping off a little of each lead so that the resistor can sit right on the end of the connector.  Makes for a little cleaner tape job. :D

<{POST_SNAPBACK}>

Indeed. This was more for demo purposes, so a person could see what terminals to plug in to. I also want to mention that there is no need to mummify the connectors with electrical tape to keep water out. Just use a little bit to 1) retain the resistor and 2) insulate any metal from shorting out. Too much tape will likely trap water inside the connectors and lead to corrosion (someday). And water won't really hurt anything, anyway. Instead, let them be "self draining". Engine heat will dry 'em in a minute. Besides, once you pull that clear plastic boot back down over the connectors, water won't be an issue anyway.
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#9 VFRquig

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Posted 12 April 2006 - 01:45 PM

I think it is all making sense now. So if I put on the new -old headers, and used the O2 sensors, I wouldn't really see much on the bike performance wise. My bike would just run closed loop at all TP and I might get a bit more sound from the stock cans? Correct? Sorry if I sound like a dumbass asking this many questions. I am just trying to squeeze as much bang-for-the-buck out of the silver bullet as possible. http://www.vfrdiscus...tyle_emoticons/default/+1.gif

#10 Trace

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Posted 12 April 2006 - 01:59 PM

I think it is all making sense now.? So if I put on the new -old headers, and used the O2 sensors, I wouldn't really see much on the bike performance wise.? My bike would just run closed loop at all TP and I might get a bit more sound from the stock cans? Correct? Sorry if I sound like a dumbass asking this many questions.? I am just trying to squeeze as much bang-for-the-buck out of the silver bullet as possible.? http://www.vfrdiscus...tyle_emoticons/default/+1.gif

<{POST_SNAPBACK}>


HS is basically right, but to boil it down....there's no real reason to eliminate the O2s if you're NOT running a Power Commander. That is, unless you're putting any kind of "headers with no sensors" on an O2-sensored bike. In that case, you'll have to do the O2 elims to keep the FI light happy.

As a practical matter in the real world, you won't see power increases and such by O2 elimination. You don't get power increases at steady-state throttle.....where the O2's "live".
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