.: XT660.com - The #1 XT660 Resource :. - Kev's O2 Controller on the T�n�r�

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- - Kev's O2 Controller on the T�n�r� ( https://www.xt660.com/showthread.php?t=20381)

On it's way in 12 hours Oz time.

Kev, where can I buy this O2 mod of yours. Got a link?

3000 Mile Update

Covered a further 3000 miles with the O2 controller fitted, so I thought it might be a good idea to give a quick update on the XTZ's performance and general running.

Firstly, the bike appears to be more economical, giving at least an additional 20 miles before the F-Trip starts flashing and is returning just over 60mpg (4.7l/100Km), whereas it used to be a little over 56.5mpg (5.0l/100Km). I believe this can be attributed to the motor pulling more cleanly from low down, as low as 1800rpm in fact, allowing for earlier up-changes and smoother throttle control; yet I’m not (as far as I’m aware) riding any slower.

The second big plus is that in heavy traffic and particularly riding slow trails the bike will spin up from tick-over with little need to ride the clutch, which makes life a whole lot easier and more enjoyable. Having had a 14T front sprocket in the past to try and achieve a smoother roll on from tick-over and snappier acceleration, I can safely say the O2 controller (in conjunction with a fuelling device) and a 15T sprocket achieves the same results, but without the disadvantages of lower cruising speed and accelerated front sprocket wear.

The O2 controller is a thoroughly worthwhile and very cost-effective mod for the T�n�r� - there is much more to it than just being yet another cure for surging R/X models.

Thank you for all the explanations. I'm thinking on adding the PCIII and DNA Stage 3 filters, plus Akropovic pipes, so it's always good to know these details. :038:

I'm just confused on the mileage part. :017:
Adding these mods will in fact improve fuel efficiency even further? I'm doing 4,5 L / 100 Km, which I already find to be very good.

Quote:

Originally Posted by JJ_pt (Post 188186)

I'm just confused on the mileage part. :017:
Adding these mods will in fact improve fuel efficiency even further? I'm doing 4,5 L / 100 Km, which I already find to be very good.

I don't think you can really compare one person's fuel economy and another's, even if the bike is the same, we all ride differently. I've just made a direct comparisson before and after fitting the O2 controller - same bike, same rider, same roads etc. The difference in my economy is down to a subconscious change in riding style as I've adapted to the different fuelling characteristics: Before I was generally riding between 3000rpm and 6000rpm; I can now achieve the same road speeds using 2000rpm to 5000rpm. Basically you're getting the same power but at a slightly reduced throttle opening.

Of course you could use that extra engine efficiency to go faster than you were before, and then your fuel economy would get worse! ;)

Quote:

Originally Posted by JJ_pt (Post 188186)

Thank you for all the explanations. I'm thinking on adding the PCIII and DNA Stage 3 filters, plus Akropovic pipes, so it's always good to know these details. :038:

To feel the full benefit of any fuelling mods (PC, filters etc.) throughout the whole rev range you are still going to need to control the closed loop with some form of O2 controller, either Kev's or Dynojet's.

TBH I've got Akros and they made no difference whatsoever to the engine's performance, they're just lighter and sound better than stock pipes!

Quote:

Originally Posted by Pleiades (Post 188183)

Covered a further 3000 miles with the O2 controller fitted, so I thought it might be a good idea to give a quick update on the XTZ's performance and general running.

Firstly, the bike appears to be more economical, giving at least an additional 20 miles before the F-Trip starts flashing and is returning just over 60mpg (4.7l/100Km), whereas it used to be a little over 56.5mpg (5.0l/100Km). I believe this can be attributed to the motor pulling more cleanly from low down, as low as 1800rpm in fact, allowing for earlier up-changes and smoother throttle control; yet I�m not (as far as I�m aware) riding any slower.

The second big plus is that in heavy traffic and particularly riding slow trails the bike will spin up from tick-over with little need to ride the clutch, which makes life a whole lot easier and more enjoyable. Having had a 14T front sprocket in the past to try and achieve a smoother roll on from tick-over and snappier acceleration, I can safely say the O2 controller (in conjunction with a fuelling device) and a 15T sprocket achieves the same results, but without the disadvantages of lower cruising speed and accelerated front sprocket wear.

The O2 controller is a thoroughly worthwhile and very cost-effective mod for the T�n�r� - there is much more to it than just being yet another cure for surging R/X models.

The closed loop circuit trys to keep the A/F ratio at 14.7:1 this is very lean & reduces the Torque & HP output of the motor & is not the most fuel effecient A/F ratio, 13.6:1 has been proven to have the best fuel economy fuel A/F ratio to HP/Torque.

With a O2 controller fitted it trys to keep the A/F ratio around 13.6:1 good fuel economy + extra HP/Torque compared to an emission control A/F ratio of 14.7:1.

Quote:

Originally Posted by Pleiades (Post 188189)

Yeah, I'm thinking in getting this one.
I'm interested on the Akros specially for the 2 Kg weight removal. It also helps in performance, doesn't it?

Adding the DNA Stage 3 and the PC + O2 will force me to go to the Dyno. I wonder if I have to go to the Dyno again after adding the Akros on a later date. Do you have an idea on this part please?

Quote:

Originally Posted by JJ_pt (Post 188207)

Adding the DNA Stage 3 and the PC + O2 will force me to go to the Dyno. I wonder if I have to go to the Dyno again after adding the Akros on a later date. Do you have an idea on this part please?

The pipes really won't make that much difference to the fuelling. You could go back to the dyno for a fresh map, but it wouldn't be absolutely necessary. The filters make the biggest difference and will be the thing that benefits most from dyno time.

That's all I needed to ear. Thank you. :thumbsup: