It is a bit technical, so I hope I can put this across without boring you all to death here.

It is recommended you start with a custom map on the PCV, made especially for your bike. Then you have to activate the Auto tune unit and update it with the required A/F values you want the unit to maintain. You have to be careful when setting the maximum range the auto tune is allowed to use. The smaller the better as it limits potential problems later on.

You also have to be careful to select the correct RPM limit on the auto tune. It is no good to allow it to tune to the RPM limiter. You also have to activate the correct wait time before it will tune. If it starts tuning to quickly and it makes adjustments while the bike is cold and running with and enriched �choke� map it will cause a mess of things.

If there is any exhaust leak in the header pipe and the o2 sensor gets in contact with the fresh air it will cause a mess. Fresh air will trick the unit into thinking the bike is running lean and add fuel when it does not need to.

A misfiring plug, allowing unburned gasses to pass through the motor will also play havoc with the auto tune and mess up the map big time. Unburned gasses contain high amounts of O2 and it also tricks the Auto tune to think the motor is running lean when it is not.

Note that the auto tune unit does not automatically override the PCV map. It keeps the override values in a separate place. The operator or tuner needs to accept the override values before the map is updated permanently.

I was also told that it is good practise to build a custom map 1st. With that, you can use small tuning ranges to allow the auto tune unit to make minor adjustments. After spending about a week or so riding and building up an "updated' list of values one have to make the changes permanent and then limit the auto tune even more. It is really bad to allow it to make changes of more than say 10 units. If anything goes wrong with the auto tune or the o2 sensor or it gets a fresh air leak from somewhere, you don't want it to add 50% more fuel and cause engine problems.

With a PCIII or PCV by itself, once it has a custom made map, you don�t have to worry too much about the map unless you make changes to the motor. With the auto tune unit, if you get exhaust leaks, o2 sensor failures, misfire on the plug and a bunch more other stuff, it can make a mess of things. There is a bunch of things one has to consider and keep in mind before and while using this auto tune. So, while it gives you a lot of extra features, it also introduces a bunch of potential problems.

what about PC5 without the autotune? is it still better than PCIII for my XT 07?

Well, the PC5 is not massively more expensive than the PCIII.

For the bit extra you get 10 Throttle positions on the PC5 where the PCIII has 9. PC5 also allows you to add 200% more fuel over stock while the PCIII only allows 100%. Most of the time you don’t need more than 100%, unless the motor is heavily modified.

You might decide to add the autotune later, so then again the PC5 is better as the PCIII cannot handle that.

PC5 also have the ability to know what gear you are in, allowing you to make fuel maps per gear which can be useful in some cases.

Personally, if I had to pick from scratch, I would pick the PC5, even if I use it in the same way as a PCIII.

Power Commander III v's Power Commander V
 

Hmmm, the quote is from my newbie hello but I think that this thread already answers most of my questions for a 2008 model.

So it looks like a Power Commander V used without the Auto-Tune option but with a custom map is the best option for me. The dual selectable map's at the handlebar could also be an interesting extension.

However any suggestions as to suitable tuning shops in Melbourne able to handle this work would be especially appreciated.

Hi Pete, Dynojet say 2009 models for the PCV, it should work with 07,08,09 XT models all with O2 sensors.

I deal with Serco directly here in Brisbane they are the agents & importers for all Dynojet products, send them a E-mail & ask them for a recommended dyno tuner in your town. http://www.serco.com.au/contact.htm

I already have the map select function on my PCIII & can select & switch between 5 different fuel maps while riding. I have been using the map selection system for nearly 2 years now, it works a treat.

what I really meant is, PCIII is not fully adjustable with 07 XT, but then PC5 is? I can adjust all rpm with PC5?

Both do the same job on the 07 model without Auto tune, the PCV is upgradeable for the future the PCIII is not. PCV has a greater fuel adjustment range which you would never use unless you are heavily modifying a motor. The PCIII is fully adjustable with a 07 XT660X/R.

I would buy a PCV for the future.

www.off-the-road.de claims that the PC5 fits XT 09 models only and they have mentioned that any older versions need PCIII. I dont know where they got this information. Ok lets say this is incorrect.

If i am going to order a PC5 for my 07 XT, i would need the right connectors, so assuming it is made for 09 model, i can easily mount the same model on my 07?

There is no difference in the injector & TPS between the 07 & 09 models, I have just checked the part numbers for those years they list the same part numbers for both items. So the connectors should be the same.

We know 100% that the 09 XT660X ECU runs on the 07 XT660X, so I can't see why it will not work on the 07 model. No one has tried it but on paper it should work.

Cost of Fitting a PC5 in Australia
 

Kev many thanks for your comments and guidance.

I've followed up with serco and they confirmed that Phil Tainton Racing (who I had already found on the Internet) was a suitable local tuning shop to complete this work.

I've given them a call and they have indicated that rough budget costs would be about $500 to supply and fit the PC5 with another $340 to carry out a dyno session and provide a custom map.

I've got no idea of whether these are reasonable costs or totally over the top for Australia.

Is it advisable to get two maps done at the sample time - one for say open road cruising and the other for high power (off road) conditions ?