Daz, i thought it only effected the tuning in closed loop around 10-20% throttle, between 2200-3800revs.

My bike is running alot smoother than it did before all mods, so I am very happy with that outcome.

Other than that, a great post..

Hmm I'm not sure about the revs though, here Dynojet says 3500 - 6000 rpm:

http://www.xt660.com/showpost.php?p=57374&postcount=16

But still it should only effect up to 20% tps.

Hi Naz, yep thats what Dynojet say, but I think it was Kev who found my information........

Aha ok, I see.

From all the dyno runs I have done with 5 different XT's the best HP & Torque was from A/F ratios between 13.2:1 below 4000rpm leaning out to around 13,5:1.

16:1 is way to lean & have never seen a motor produce it's best HP at that A/F ratio. I suspect your exhausts are not completely sealed or are leaking or the CO dyno meter was not deep enough in the exhaust. I will PM you my email address please email me your fuel map to have a look at, I will be able to see straight away it the A/F reading is out. The dyno tuner would have tuned for the best result, I just think the A/F reading are not correct.

Hi Kev...i did check for any leaks and used paste for all joints on my new exhaust. But I will double check them.

I agree Kev...looks like the AF's are up the creek!

But she runs sooooo sweeeeet!!!!! and doesn't pop by the way, and the low end power/ running at low throttle positions is excellent!!

I am sure it runs well & nothing really for you to worry about as the dyno would have told the operator where the best HP was.

Have a look at one of my dyno runs, look at the last graph, the A/F ratio is at 14.7:1 in Blue is to lean compared to the green line at 13.71:1 now run up the line you will see the blue line is down in Torque & HP. See how it lost HP & torque with a lean A/F ratio.

http://i201.photobucket.com/albums/a...tx/xt660-2.jpg

I am sure you are going to have a sore face, from all that smiling, now go enjoy that bike.
:ytiller:

and I have just double-checked carefully, no exhaust leaks.:bunny:

It could have been the CO sensor giving the incorrect A/F reading or a fitment problem. I have PM you my email address please PM me your fuel map.

I mean, in all fairness Kev, do you think it's right to be dynoing and mapping these bikes knowing with the problem with the ECU?

Cause as it stands, as far as I'm aware, untill we can find a suitable solution that can be distributed for turning off the O2 sensor in the bikes ECU, its probably fair to say that you're only going to get a limited map completed on these if anything?

Kev, i only have 9 messages in my folder....so room for a little one! it never arrived.

I think he didn't really stick it in....(!)....But it cant be far off, or if it is, i will be really suprised......and driveability is my goal.........

They ought to go IN the exhausts, otherwise it's measuring the ambient air and would show a leaner AFR than what its actually producing, its why most lambda sensors on cars and bikes are straight after the manifold and before the CAT to get the most accurate reading possible.

Kev...you need to clear your message box again...it says you're full!!

I agree Daz, but on paper my bike looks bad, but goes like a dream....i think the AF wasn't measured as well as it might of been tho'...........but i dont think there could be much more of a difference in feel......

Yes, but like what was said earlier, the PC3/5 aren't able to map on these bikes very well because of the O2 sensor problem so the bike would still run regardless. If you were able to disable the O2 sensor and went back to remap, I think you'd find a couple more ponies and a much MUCH better AFR.

Daz, its only the lower rev bracket where the o2 sensor interfers..........come ride my bike...you will see how sweet she is now....:happy::unibrow::happy::unibrow::037::037:: 037:

I was only analyising with Kev......no offence!

I beg to differ...

http://www.xt660.com/showthread.php?t=6708&page=2

First post on page 2, Paul quoting what it states on the PC3 Box.

Don't get me wrong, im not arguing, im just saying why you're probably getting a very bizzare AFR :)

If you look at the Videos on youtube, you can see the AFR Fluctuating between lean and rich by quite a substantial amount!

I've done testing for Kev and found that with a certain piece of equipment on the bike, that I'm able to map it perfectly, as is the same with Kev.
However, this Piece of kit is still very, very much in the development Phase and cannot be revealed.

This is all a debate about the A/F ratio reading I am sure the bike is running well. The last dyno run posted was using the exact same ECU as richardsracingmad is running.

dazmatic has been do some independent testing for me on my new O2 eliminator, I am still trying to find an electronics engineer to help me build the O2 eliminator, I know it works & can prove it, I just need some help in building an electronic version, I have a electrical version working but is to hard to wire up & sell for the average rider.

Kev, you have email...

and to further on from what I've mailed you, I've just found something even more interesting, but I'll let you read what I've sent you already first.

I will try to get my internet connection on the laptop, and will email map to you.......grrr....i hate computers.

I suspect the initial runs he did, with the DNA Map Open akros, the probe wasn't in properly, and then I think he re-adjusted it.........I would like to know other AF readings of the DNA 660 Open Ackros map

map sent Kev.....best you read the other emails first....check that it is not the DNA 660 "Open Acros" map,it should be a modified version of it, just havent retitled it.. its all new to me!
I also sent you my standard bike AF's, from my first dyno.....not sure if this is a PC111 Standard map or not, I bought it off Simon, and I think he may have pre-loaded a map on it. I had fitted and connected the PC111 on my bike for this first "Standard" dyno,, but hadn't linked it to a computer......

Are you able to get the guys to email you all your dyno runs, then forward them on to me?

Yes I will forward them on, I asked them to do it, just hasn't arrived yet.......

Well, glad its all running well! I know for sure that mine runs a hell of a lot better and thats with just the stage 2, been meaning to get the stage 1 but want to see what my DIY Stage 3 ends up like. And im currently in the process at work of making up a map switch to mount on my handlebars to be able to switch my autotune from Map and Learn mode.
1 because its something to do in 'free time' at work
2 because I can
3 because I can make it out of shiny stainless
4 because It'd be nice to have something custom built
5 because I'm too tight to buy one

:eusa_dance:

But Kudos to ya mate for getting it all set up!

Hi again Daz.....I don't think this is the optimum setting for the bike...... when looked into it, I think the AF Readings and Mapping don't make any sense..... but yes it goes very well!!

I am going to get them to do another AF check.........

Agree the A/F ratios do not make sense, I am sure the dyno tuner would have tuned for max HP & Torque.

Hi Kev..... he DIDN'T tune for max HP.....is my theory.......

My bike is down 1.2 Hp between 5750-7250 from initial first runs, (when AF reading was 16.5:1-17:1.) Torque is very similar all the way through...I have a feeling that he spent the rest of the time trying to reduce the AF..

I would have thought that if ANYTHING, my bike at that stage would have had a TRUE AF reading of 12.25:1 ..(not 17:1 as it showed)

(12.25:1-12.5:1 was First "Standard" Bike Dyno run AF reading between 4500- 7250), as I am running 97RON Super unleaded.

So, I think he should have been tuning LEANER, not RICHER, ..but the AF's were telling him the opposite!!

I think the optimal power was at 18:1 (on HIS readings).....or 13.25:1.
But then I think he adjused the probe which gave better lower readings, but i think these readings are still too high (too lean).
My Custom Map has a slightly lower AF than the DNA "Standard" map....but in reality it should be higher.

He said my bike was running very lean when I brought it in.....eh??? should have been 12.25:1 or too rich



They are nice guys at the Dyno, unfortunately they are closed on Mondays, but will speak to them today. I would like to see an accurate AF, which is the weird thing, and go from there.....if it needs another session to put my mind (and everyone else's) at rest, then so be it. They are an Approved Dynojet Centre, very nice people, race at Le Mans, and have a good reputation, so I am sure we can get to the bottom of this!

Keep you posted...

Well, ideally, for maximum power, you should be looking for an AFR between 12.8 and 13.2, in that region, to be getting readings like that, something must have really gone awry!

hi Daz....i suspect my real AF is around 12:1 12.25:1.....so needs leaning up to around 13.2:1.

We'll see...............still she a flyer!!

Great news...they say they are happy to have it back in for another dyno, on Saturday, will post results after the weekend, as I will be leaving my bike with them.

thats some good new then!

Make sure that this time round they put the lambda sensor in the exhausts properly, and that when they perform the dyno run, it doesn't blow up or out..

Bear in mind though, that with the AFR being all over the show in the mid range because of the ECU, you don't be able to get it spot on there.


Also Kev, you have another email and I've ordered those 'bits' too, to have a try.

I have already replied to your last email, nice work mate we are closer to finding a solution for the new mod, thanks for your help.

I have loaded Richards fuel map ready for data logging on my bike which has the exact same mods. I would expect a bit of difference due to different fuel blends & different ECU. I will post the results tomorrow.

Archangel Kev.......you're a star, mate.

Yeah, I just got it.

I ordered the bits last night and amazingly enough they turned up earlier on!

So I shall hopefully get the soldering iron out later on and have a play. Hopefully have some results by the weekend.

nice one Daz......we are looking forward to a solution......

I'm reading this thread with interest and have read alot of the other bhp threads and how has ktm managed to get 20bhp more out of the same cc. I know ktm's have shorter services schedules etc but Yamaha surely could have given the XT a bit more bhp. In such a low state of tune the XT should last a lot longer which is a plus point.

I've had a quick play tonight, however its absolutely pouring so can't do much

:weathermanf4[1]: = :cry[1]:



BUT, initial results look promising.

Watch this space.

I'm watching.....these things take time. Good luck with it......

....and you can sit on it alot longer too.....yes, I do agree that they are not as fast as most of the KTM, Husky, Vertemati, etc....but thats not the point. They are more of as "Softroader",, and that they do very,very well.....