Reflash ECU!
 

Is it just me or has anyone else found these great news !

http://www.ecu-flashing.com/category/yamaha/xt660/

http://www.apriliaforum.com/forums/s...65-Ecu-reflash

It seems to be very promising for us with XT660.

Cut from Webiste:

The reflash offer:

New fuel tables

New ignition timing tables

New Rev limiter 8.000 rpm

New fan working temperature 98-94 celcius

Disable deceleration fuel cut for perfect throttle responce

Disable AIS valve no more “popping” from the exhaust

Fixed the know “Surging” issue caused by the O2 routine

The number of the ecu that we can flash is: 5VK-8591A-10

We are looking all ecu for this bike so we can flash all the models

I think that the company needs more ECUs to extract the flash from so if you have any old ones that is not used I suggest you contact him. If we could send him old ECUs maybe we could all benefit fro that.


EDIT 2015-04-27:

I have now posted a recap of the results in the following post : http://www.xt660.com/showpost.php?p=209619&postcount=34

Yes we have seen a few guys that can re-flash the XT's ECU, we had the first one was done back in 2008, we have had a few riders re-flashing their ECU's but the cost was high those days & you still needed to correct the fuel table in the F/L fuel tables to get a custom tune if the motor has been modified or filters & pipes have been fitted, most of the flashing guys only offer a re-flash for a standard bike.

I personally re-flash my own KTM ECU's, I build custom PCV maps on the Dyno then import all the custom tunes into the OEM KTM ECU's so the PCV is no longer needed, I extend the rev limiter, tune off the closed loop, remove the EPC so the ECU does not retard the timing in the first 3 gears & a few other tricks, I have been doing the KTM's for a few years now.

The big improvements that I can see is the fix for fuel cutoff when closing the throttle and the possibility to alter the ignition map. Those options is not avalible using the powercommander.

I have sent one of my spare ECU�s to Spiro, it is the first generation -00 that was on my bike originally (2004). One of the ecu�s that had most problems.

Spiros have now extracted the fuel and ignition map from it and made a discovery.

The Ecu used is the same as used in the Aprilia Strada 650 but it is diffrent regarding the maps.
Yamaha has a 20-30 degrees more ignition advance in the area were the XT has the most surging compared to the Aprilia. He will soon send me some screenshots of the ignition and fuel maps.

This could be the reason why it is so hard to make the XT completly surge free as the Powercommander does not change the ignition timing. If this is one of the reasons.
I understand that it also has to do with the fuel tables, but if the ignition timings is completly off it will be hard or impossible to tune with only fuel.

I know that the powercommander for the Raptor 700 has the ignition module so that you can tune the ignition maps. Why is it diffrent for the Xt660 since it is almost the same engine?

Different manufacture spec I would say

I have now managed to re-flash my own MT-09 OEM ECU using flash tune software, I can import any PCV map & change virtually anything in the OEM ECU.

http://i201.photobucket.com/albums/a...ps1e3026a4.jpg

Here is the ignition maps for the Aprilia and the xt660 for comparison.

The first one is the XT660 ignition map.

http://www.xt660.com/gallery/display...p?imageid=2153

And this is the Aprilia ignition map.

http://www.xt660.com/gallery/display...p?imageid=2154

As you can see the ignition timing on the XT660 is way diffrent on the area were most of us feel the surging. Around 3000 rpm area or the cruising rpm. And on WOT the diffrence is minimal.

There is also a big difference on what RPMs the changes are set. As you can see in the pictures Yamaha and Aprilia has chosen diffrent throttle openings to tune and compensate.

It could be that the yamaha was made for more markets in the world with diffrent demands for the combustion regulations. And because of that had to make changes that will affect the performance.
Aprilia on the other hand has less markets and sold mostly in contries with high quality fuel.

So who has ridden both and can give feedback on the comparison?

As soon as I recive the reflashed ECU I will give an comparison between them. I have two ECU's, one that is beeing reflashed and one that I am using on the bike now. So I will be able to compare them easy.

I bought my bike as a "salvage", the bike had been victim to a theft attempt so the immobilizer antenna was broken.

I then bought a immobilizer disabler wich means I can use any type of ECU on my bike without changing the locks or keys. This makes it easy for me to test diffrent ECU's.

I also have a Powercommander 5 on the bike that I will disable during the testing.

I also have a KEV fuel mod that I can set to zero to disable it during testing, or compare.

The rest of my bike mods consist of disabled AIS, DNA stage 2 (snorkel removed) and original exhast.

I will post the results here later.

Fantastic, looking forward to the outcome.

I've run a K1200 for over a year with a re-flashed ECU by Rexxer it runs really well and no piggy back to fit or set up.

Where you'll find things changing when more folk get into re-flashing you just supply your spec ie exhaust and filter set up and they supply you the correct tune with allsorts of mods like being able to disable the lamba in the map and just leave it connected

When I first enquired about such the quote I had was 'PC's will be dead within 3 years' which at the time with two bikes with PC's I took exception I'm not sure about 3 years but their definitley on slippery slope.