We'll, I should get the rest of the stuff through the post over the course of the next couple of days and ill make a few up and will sort something out then.

I'll be sure to stick a multimeter on each one to make sure they're the right resistance and working but yeah, all in good time!

:mbounce:

Been making & selling O2 Eliminators for a few years now, even complete kits 07> fuel mod, O2 sensor Eliminator with blanking plug, these days there are few more guys selling them so the buyers have far more choice.

Good on any one who can make their own, that is why I made a whole thread on how to make the O2 Eliminators & fuel mods, to save some money for all XT riders.

Exactly!

I had to buy everything to make my own in bulk so I thought I might as well spend a little extra and make a few more and make the most of the stuff I got.

Yo!!

Quick question,

any word on whether the new O2 Eliminators have been released yet?

I'm eager to see if my Autotune will map the lower RPM ranges with it...

Cheers!

Nothing yet.:cry[1]:

Dayum!

That sucks! Took the girl out for a blast today and well, I need to change the tyres! They're awful, little bit of water on the road and its like riding on ice.

I need to get my laptop out and connected to my autotune again Kev so I can accept the trims and get the corrected map off it, once I do, I'll fire it back over your way again to look at... :smilies0546:

I have been away for a while and I dont remember asking this, sorry If i did.
If I have an XT660R 2007 with O2 sensor and lambda probe, can I still use the o2 eliminator or not? Even If im not using a power commander or a fuel mod? What do you recommend?

The only problem with the O2 sensor is that it intereferes with a map on a power commander or a fuel mod like the Kev Mod, if you don't have either of them then there is no point modifying a stock bike by overriding the sensor.

I got quite excited today, I have worked out a way to turn the O2 senor off on my 09 XT660X.

The solution has been staring me in the face for ages I just did not see it for the life of me, we have all failed making successfully O2 Eliminators or voltage generators & O2 Simulators that will work with the XT660X/R. So I started thinking wish I could turn the damn O2 sensor off, with a few days testing & playing with my bike I finally found a way to turn it off while riding & could map the PCIII as I wanted. You would need to have a PCIII or PCV to work with this mod.

Have a look at the first clip, the A/F ratio this is with the O2 sensor connected. The second clip is with the O2 sensor turned off & remapped with my PCIII.

O2 sensor turn on, standard XT660X
http://www.youtube.com/watch?v=ZwTfuwZZ848&feature=channel

O2 sensor turned off.
http://www.youtube.com/watch?v=1Y9mqJtXtm4

You ask how I have done it, well it is to top secret at the moment, at least until I can get my head on how to build it to run on a everyday XT.

If there are any electronic guru's out there I need to speak to you, as I can do with a bit of help on the electronics side of things with this mod. By switching off the O2 senor it effects other functions of the ECU & I need to find a way to build the mod electronically to switch them back on, I can do it with a whole lot of relays, but want to do it electronically.

wow Kev, that looks like an excellent solution.

Let's hope we find some "pot heads" that can help you with the electric mumble jumble! :eusa_clap: :eusa_clap: :eusa_clap:

Weeeeeeeee

Getting all excited here :luuurve:

I am looking for someone to build me an electronic device that can be programmed to react off different resistance inputs. I can do it with a few relays, resistors & temp sensor but want it electronic. The device will need to react to different resistances & once a specific resistance is seen, turn on & off different circuits.

As in the past, with all my mods we do lots of testing, so we need to test this mod on different bikes first to see if the mod works on all XT's. Once we have worked out if we can make an electronic devise I will tell all. I would normally keep such testing behind closed doors but now need some help. :sleep01:

So, what we looking at here?

The AFR change is seen by the ECU as a change in resistance?
And what you want is something to go inline to oppose that?

I need the device to switch to different circuits when it sees curtain resistances.

The device has one input & one output wire, when it sees lets say an input resistance of 20K it switches to one output thought a resistor, then when it see a resistance of lets say 10k it needs to switch the first output circuit off & switch to the second output.

Any ideas?

The basic idear is shown on this diagram, it would need a device that can sence resistance & switch circuits only at the given resistance. Simple circuit, but do not know of a device that can actvate the switching.

http://i201.photobucket.com/albums/a...titled-1-2.jpg

Whats the voltage on the input?

Because according to ohms law V=IR

Surely then you can work out the current through that set, and the current and voltage from the 10k input because less resistance = more voltage and just find something that will switch based on the voltage in the line?

EDIT:

Even simpler, a transistor should do the trick no?

Example, when the resistance is 20k the voltage is say 6v. When the resistance is 10k the voltage is 12v.
A transistor can see the difference between the 2 voltages and switch circuits from the input voltage.

Least, thats my brief understanding of it from what I just read.

I still need some more time to work out the exact voltages & resistance of the desired inputs. I have been testing the mod as a fixed resistance which works fine, as mentions it does effect other circuits.

The input wire has a fixed 5volt input then runs through a NTC resistor, at 0.640K ohms I want it to run through the top circuit throught a prefixed resistor, then when the input resistance reaches 0.140 K ohms I want it to switch to the other circuit with no resistor.

Kev,

Have a play with this.

http://www.falstad.com/circuit/

Its a circuit simulator.

Might be useful.

EDIT:

Just spoken to a mate of mine, might be able to get away with a couple of Zener Diodes he say.
I'm at college tomorrow and got electrical second lesson for a couple of hours so ill quiz my tutor. should be able to help.

Siliconchip.com.au
 

Hi Kev. I'm not sure if these guys ( http://www.siliconchip.com.au/menu_2...s/aboutus.html) can help but a few years ago I bought two electronic projects from Jaycar that these guys designed.

It's a bit of a long story but basically I wanted to control a 4speed auto's lock up clutch torque converter at a selectable speeds in a 65 Impala. I had to modify them to link the two to do the job I wanted. I emailed them and they helped me redesign the output of the first to link to the second. That same project has been in the car since 2005 and still working too..:winner:

They design all sorts of circuits as projects for amateurs and professionals, so you never know..It wouldn't hurt to send them an email with your needs maybe?

Greg.

Thanks Greg, I will have a look at the site.

Kev, I think I may have cracked it.

What resistor was you thinking about putting in the circuit when its at 640 ohms?

Bah...

Had something that I think worked and lost it by mistake and can't remember what I had done :(

It still has that warning...just received my PC111 yesterday.......any more news on how to make the fuel changes?, as I am fitting a DNA ST.3 Airbox and Carbon Cans, and following shortly a custom map on the dyno, and so I am looking to get optimum "pull" throughout the rev range. ?

If it is possible to solve this, it doesn't sound like the solution will come from Dynojet. I emailed them about this last week and received this:

"We have no way to disable the stock o2 sensors without tripping a fault code in the ECU and causing the FI light to stay on. I do not know if/when we might have an o2 controller for this model. As long as the stock o2 sensor is running the Power Commander will not be able to tune the lower RPMs and throttle positions.

Let me know if you have any further questions."

Thats really useful to me, thank you Nazzurro.

So, does that mean that NONE of the O2 Eliminators will work without tripping the ECU on a 2008 bike? Seems like that.

Would the Kev fuel mod together with an O2 eliminator help with surging? Or does the kev fuel mod suffer from the same limitation as the pcIII when it comes to richening the fuel mixture at low revs?

The reason I'm asking is that if the kev fuel mod can help at low revs which the pcIII can't (together with O2 eliminator), then for me the kev fuel mod would be a better option than a pcIII which I was after in the first place.

I think that the Kev Mod and the PC111 basically do the same thing, the PC111 is more adjustable, but alot more expensive.They both allow you to alter the amount of fuel at a given time.

Yep, but they accomplish it using different techniques, so I figured maybe the result could be more effective at low revs with the kev mod as it just tampers with an input signal to the ecu. Who knows, maybe the ECU would consider the temperature also in low revs, and richen the fuel, thus lessens surging.

Just speculating... :)

best ask Kev!!!

The O2 sensor can be turned off as I have already worked out how to it &have done it, I have shared my findings with Dynojet USA.

I am still working on this new mod so it can be easy for others to install, at the moment it is quite complex to wire up.

It is very easy to keep the engine light off when the O2 sensor is disconnected, we have been doing it here on the forum since 2007.

This is what the surge looks like on my 09 XTX with the O2 sensor connected, at a fixed throttle setting while riding.
http://www.youtube.com/watch?v=ZwTfuwZZ848&feature=channel

This is the O2 sensor turned off at the same throttle settings. With the O2 sensor turned off you do not need a O2 eliminator.
http://www.youtube.com/watch?v=1Y9mqJtXtm4&feature=channel

All this information can be found in the Modification index

http://www.xt660.com/showthread.php?t=630

http://www.xt660.com/showpost.php?p=83237&postcount=10

Aha ok, thanks for that info, lets hope they make use of your research and provide us with a good solution!

So, have I understood things correctly: currently there is no easy way for me and fellow xt riders on 2007 an forward models to get rid of the effect the O2 sensor have on the fueling on low revs, other than switching to the older ECU including wire harness?

Running an O2 eliminator on mine with a PC3 and no problems am also running the map D.N.A sent with the stage 3 filter

Running an O2 eliminator on mine with a DNA stage 3 filter and Staintune pipes (no PC3 or any other fuel mod due to "rich" ECU). Minimal surging.

Ok guys, thats good to hear. It does sound reasonable to me that an O2 eliminator should be able to even out the A/F ratio, even though this might not be enough (yet) to allow a PCIII to have full rev range control.

I should probably just get myself an O2 eliminator and see what happens, they don't cost much.

The O2 eliminator has nothing to do with the tunning on our XT's it is only there to keep the light off.

When the O2 senor is unplugged the bike runs quite rich in the closed loop circuit. I got the same A/F ratio with the the O2 sensor unplugged with & without the O2 eliminator.

So the O2 eliminator only acts as a happy medium to stop the dash from throwing up an engine check light?

i think that we are all talking at really low revs....around upto 1/4 gas..

On a 11 ECU the closed loop circuit is activated above 2500rpm when the motor is above 70 degree C water temperature. It does not run up to 2500 RPM & from cold to 70C water temp. It will also be affected by throttle positions.

When you unplug the O2 sensor the ECU runs on a prefixed map that is to rich for most mods, it will run on this map with or without a O2 eliminator connected. On most bikes the fixed map has a nice stable A/F ratio, on our XT's it is to rich.

When the O2 sensor is unplugged & logged the A/F ratio shows the surge, with the ECU switching between the open & closed loop circuit every 10 seconds, when the open loop is active the AIS valve is activated, when the closed loop is active the AIS vale is closed.

Thanks for clearing that up Kev! I finally think I get it :)

Another Dynojet update
 

I have just received an email from Martin Winstanley at DynoJet UK Ltd as follows.

Thanks for the enquiry. I'm guessing you main problems are when 'rolling on' from closed throttle, and slow speed/small throttle openings ??

If so, we currently developing an O2 eliminator for this bike, I would recommend waiting until this available.
Currently we do have a Power Commander available, however until we can disable the bikes O2 sensor the bike will over write any changes the Power Commander makes at small throttle openings. Although you will feel the benefits at higher throttle openings the small throttle openings will be unchanged.

Please keep checking our website for further updates

I have also been told that DynoJet will be making a visit to Europe next week and the O2 Emulator/Eliminator for our bike is on the top of their list.

Great bit of investigation, I hope the new gadget comes soon......

Exciting stuff, I feel it's only a matter of time now :applause: