Originally Posted by Kev (Post 133466)

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.

Originally Posted by Kev (Post 57217)

We have just received some advanced information today regarding the O2 Eliminators.

Please read below.

DynoJet have stopped making them as they have realised that according to them this 02 eliminator does not work on the 07 & 08 bikes with the lambda probe. He told me that now all PCIII for the 07 and 08 models comes with a warning that people must just disconnect the Lambda probe and not map the fuelling around the 2K mark (I think he means the rev rage of 2000 revs) The fault comes not from the Lambda but from the ECU fitted to the 07 & 08 bikes which causes them to surge. DynoJet has reported this fault to Yamaha and they think that Yamaha might reprogramme the ECU's to rectify the problem, however Simon doesn't think they will do and suggest that all Dyno testers must keep this in mind when designing a map for these range of bikes.

Freez & myself will carry out some tests soon. If the O2 Eliminator is not at fault, I cant see why they no longer what to fit them. I know the software is not right in my 07 model, I reported this on my last dyno run as I can't get my air/fuel ratio perfect in lower rpms. It is not bad I would say 95% perfect.

We will amend the necessary threads relating to this O2 Eliminator.

Originally Posted by cliffordsyoung (Post 134317)

I have just received an email from Martin Winstanley at DynoJey 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.