Finally! First test ride today.

Test setup: Reflashed ecu, powercommander 5 with a zero map.

The absolute biggest diiference is in the cruising with low throttle openings. Like when going 50 km/h in town.
Before on the original ecu, when the engine went from load to low or little load to engine breaking, it was jerking and stuttering. Now it has a smooth transition between the three diffrent load conditions. Almost like a cruiser bike....

When going full throttle and hard accelerating, my butt dyno feels no difference. It does how ever feel more easy revving, I guess it has to do with the changed ignition map and the changes in advance.


I also put a new Creptus exhaust on the bike ( see thread in exhast section ) and I now have some serious exhaust popping on decel. And yes I have blanked of the AIS, first I will check if there are any leaks at the exhaust ports.
If I dont find any leaks I will add fuel on the powercommander on 0 throttle position above 1500 rpm. Since the original ecu has a complete shutoff in that section I will now be able to add fuel there on my reflashed ecu.
I will test and report back, I hate decel popping and it is annoying when riding the bike in towns. Some like it, some dont...

Nice report what ECU are you running on your bike, 10, 11?

It is actually the first generation -00 with the worst problems. I also have the -01 version that I change between to evaluate the differences.

So now I have done some extensive testing with the bike and have come to some conclusions regarding the reflash and also some tuning.
First of all lets recap of what has been done to my bike.

The bike has a 2 into 1 Creptus exhaust system, Completely removed AIS with the hole between the headers blanked of using the OTR blanking plate. Stage 2 DNA filter, and snorkel removed from airbox, also drilled some holes in the cavity where the snokel was, as the hole from the snorkel is smaller than the filter ( as of KEVS instructions.).

The resonance chamber in the intake removed and plugged. Engine air breather rerouted from the airbox to external filter.
I have two different ECU�s one 5VK-8591A-00 that has been reflashed with the following modifications: Revlimit raised to 7850 rpm, New ignition table ( same as Aprilia Pegaso), and most important the fuel cutoff when deceleration is turned off so I now can adjust fuel in the 0% throttle position.
This ECU also has the following powercommander fuel map flashed in memory:

Kev_fuel_map.djm
Yamaha XT660X 01 ECU
S/Steel Carbon Can Co Cans with baffles in
DNA stage 1 & 2 filters
Modified Air Box with Air Snorkel removed
Kev current map 18/04/07

And also one original ECU 5VK-8591A-01 to compare with.
To be able to switch between the ECU�s I use a Immobilizer bypass module on the original ECU and the reflashed ECU has the immobilizer turned off.
When using the original non flashed ECU I use a Powercommander V with the same fuel map as stated above. And when using the Reflashed ECU I use a zero map altered only in the 0% throttle position by adding 20% fuel in that range.

Ok so what are the differences between the two ECU�s��
First of all when using the original ECU I cannot compensate for deccel popping. It bangs loud when decelerating. Regardless of the settings in the Powercommander. I hate this, especially when riding in city traffic.
The other difference is the surging on low rpm, 2000-3500. I cannot fix this area when using the original ECU, I guess it has to do with the ignition table as stated by Spiros.

On the reflashed ECU the cruising is fixed, no surging, and I can completely remove the deccel popping by adding 20% fuel in the Powercommander on the 0% throttle position. This also takes away the annoying behavior when going from engine braking back to throttle. No hesitation and stalling.
The bike now drives like a charm and the drivability in the low RPM range is perfect.

I am going to mail Spiros about the changes I have made on the fuel table regarding the 0% throttle position so that this can be added to his reflash as default.

This will make the make the Powercommander obsolete on my bike as it will no longer be needed. I can then only use the reflashed ECU and get a great running bike.

Very good thread!!!
I work for ignition map for power commander 5, so I wand to be sure before...
The Ignition table for XT660X after 2007 are like this ?

http://loganrythmix.free.fr/Picture/...itionTable.jpg

Well, If my last table are right, I translate correction to the Power Commander V ignition table like this :

http://loganrythmix.free.fr/Picture/...ableXT660X.jpg


Is it correct??

Kev and guys here I need help. I have think to put my bike on dyno. I have now fuel mod, o2 mod from kev, dna stage 1,2, snorkel removed. Now my question is for ECU reflash I have I guy who works with bikes and doing dyno and also reflash.

Can I do this- "Disable O2 sensor and compensation maps" or is better to do tuning with o2 mod from kev? Didn't think to put PC on it. Just to reflash original fuel map modified.

Holy crap!!!
I live next to Spiros Samios!!!!!
He is doing the service in my car and he has never ever spoke to me about remapping!!!
Ο μαπας!!!