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Buell Forum » XBoard » Archive through September 08, 2012 » My first buell flat spot at 4000 rpm Part 2 « Previous Next »

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Ktmguy
Posted on Thursday, August 23, 2012 - 11:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sorry, for some reason I cannot reply to the original post below.
I simply wanted to update the situation with a tad more info.
The bike has a K&N air filter
it has a breather by pass
The Exhaust, looks like the original exterior can, but the outlet (the entire endcap oval, as well as the exhaust tip) is what looks like Brushed aluminum and says Drummer on it.. Making me think the info I got was probably right, that the folks simply modified the existing can.

The ECM simply has serial numbers on the top of it.

I was told it had the mapping richened a tad to make up for the filter and exhaust.
There is no popping on deceleration.

Again, pulls like a freight train to about 4.. flattens to about 5.. then runs like a scolded dog (or as scolded as a big air cooled v twin will run)

I will get pictures saturday of the ECM and pipe, IM currently working longer hours than normal here at the office, and another motorcyle restoration has been taking up alot of time!
I sure do enjoy this bike though!

as always, any and all help appreciated!
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Sifo
Posted on Thursday, August 23, 2012 - 02:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was told it had the mapping richened a tad to make up for the filter and exhaust.

I'm guessing that is the problem right there. IMO you can't simply richen it up a bit and have it work well. We aren't dealing with needles and shims in a carburetor here. If you have it remapped by a competent tech on a dyno it would probably be fixed. EBR has race ECMs available for common setups like the K&N filter and Drummer exhaust that would also probably fix it. I think the Drummer is supposed to work well with the Buell race ECM too.

I'm guessing that being a Drummer the exhaust valve is no longer there. True?
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Ktmguy
Posted on Friday, August 24, 2012 - 08:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hmm Competent tech, where would I find one of those? The harley shop near by isnt very "Buell" Friendly!

Correct, the exhaust valve.. Or at least the control on the air cleaner, is no longer there.

I have no info on the original owner, however supposedly he was bit of a buell fanatic, and knew what he was doing, perhaps he tuned it for his riding style,which would be above 4800 rpm in this state of tune cause it pulls like hell in that range. So I simply call a Ahrley dealer and they will know whats going on..


The Exhaust



The ECM, Is this stock?
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Ktmguy
Posted on Friday, August 24, 2012 - 10:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I just wanted to add, that it doesnt need to be during full throttle runs, even slowly runningup to 4000 rpm at 1/4 throttle you feel it? If thats not the Stock ECM in the picture above, perhaps the Race ECM would be the answer. The only problem being, is my exhaust truly a "Drummer"?
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Theshue
Posted on Friday, August 24, 2012 - 10:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

it looks like you have a quiet module insert in the tip of the drummer. i say pull that out, (bolt on bottom of the tip) slide out the insert and go for a ride.
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Ktmguy
Posted on Friday, August 24, 2012 - 10:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

O.k, thats an easy option, I wil try that.Does that make much of a difference, I assume it would change exhaust pressure, etc..
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Ktmguy
Posted on Friday, August 24, 2012 - 01:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

update:
Harley dealer seesm to say that the ECM is self learning, and the only thing they can do is reflash. So thats out the window. Said it could be timing related? hmmmmm..

(Message edited by ktmguy on August 24, 2012)
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Sifo
Posted on Friday, August 24, 2012 - 02:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Looks like a Drummer. I would guess that's the stock ECM. The race one would say "off road use only" or something like that. Not sure what the EBR one looks like, but I would expect it to also say off road use only. I would be surprised if it was timing related if it runs well elsewhere, but that could be checked. I still remain suspect of the unknowns of the tune on the ECM. It's a rare HD dealer who can do a decent job of tuning a Beull. It's a rare independent that understands Buells too. Perhaps someone can chime in with local knowledge of who can do this for you.

It can be done DIY with a cable, and available software, but it takes some learning and if done poorly, can cause engine problems long term. If you want to learn about it search for threads on ECMspy on BadWeb. It's been covered quite well. I think the other software that is used is Tunepro or something like that. Both will let you make any necessary changes to fuel and timing maps as well as other parameters.

The EBR ECM might be the best bet if you aren't comfortable with tuning yourself. Checking the timing would be a good place to start though. If you aren't comfortable with that level of working on your bike, then I would advise against trying to tune it. I'm not trying to sound judgmental, but a lot of folks just don't get along with turning wrenches. If you want to turn wrenches, get a service manual. It will be one of the best investments you can make.
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Ktmguy
Posted on Friday, August 24, 2012 - 03:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Im thinking the EBR racing ECM may be the way to go also.. Im confident in turning wrenches on a bike, have done so for 20 years or so.. But never had to deal with the electronics outside of a stator or coil, etc.. I have a copy of ecm spy and a cable that came with the bike, but it seem like its in German..I will buy a new copy to do the TPS resets. Is there a place on here I can pick local talents minds and maybe someone can step up and give me a hand here in NC? Handsomely rewarded of course! Thanks Again for the help!

Looking at the EBR ECM..it has both a drummer, and a drummer ss.. WHat is the difference? will it matter one way or the other,and will it matter if I have the insert in mine to keep the noise down (which I like and would love to keep)
Lastly is there no way to contact them other than the email adress, I have gotten burned a time or two getting things off net stores, and no way to contact them other than an email!

(Message edited by ktmguy on August 24, 2012)
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Livers
Posted on Friday, August 24, 2012 - 06:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


quote:

I have a copy of ecm spy and a cable that came with the bike, but it seem like its in German..




In EcmSpy, 2nd menu item says Konfiguration, then select Programm. There is a drop down list halfway down the dialog labeled Sprache. Pick your poison.
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Kds1
Posted on Saturday, August 25, 2012 - 10:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

ktmguy,
here's my number 828-381-7546...call me..I'm in statesville nc...I will help you with the bike since it has my exhaust on it...

Kevin Drum
www.kdfab.com
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Sifo
Posted on Saturday, August 25, 2012 - 10:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Now how often does a manufacturer approach a customer (who picked up their product used no less) to help them out with a problem?
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Kds1
Posted on Saturday, August 25, 2012 - 10:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

thanks sifo, thats what I'm here for...no sense in ktmguy riding a bike around that is not performing right when we know it will work fine...I've never had an issue with any Buell I ever owned...

Kevin
www.kdfab.com
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Ktmguy
Posted on Sunday, August 26, 2012 - 01:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This is Fantastic, and highly regarded! Thank you! I will call you tomorrow.. Right now I am lookign for a driver or something to get ECMspy to work.. Thank you again everyone, Im feeling better now!
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Syonyk
Posted on Monday, August 27, 2012 - 03:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Im thinking the EBR racing ECM may be the way to go also

Totally agree here.

My XB9 with the Buell Race Exhaust had a flat spot between 4k & 5k - I didn't actually realize it was a flat spot initially, there was just a fairly brutal "hit" at 5k RPM. I was not a fan of the abrupt transition. There was a piggyback ECU that was doing some fuel adjustment, but I couldn't get rid of the flat spot.

Put the race ECU in, and it's totally gone. The bike just pulls hard and smooth all the way up through the power band to redline.

I've got a race ECU on the 1125R (best money I've spent on the bike yet), a race ECU on the XB9 (incredible improvement in how it runs/pulls, and it stopped dying while warming up), and a rejetted Blast (huge improvements when combined with intake/exhaust).

The race ECUs transform all of the bikes from what the EPA mandates into what they should be (which is pure awesome).

You can spend a lot of time and money dinking about, or you can just get the race ECU, install it, and go ride. I don't regret any of the money I've spent on the EBR race ECUs. They're the guys who built the bikes, and they *clearly* know how to tune them.
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Jbolt
Posted on Tuesday, August 28, 2012 - 11:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

+1 on the Buell race ECM. I've had mine for a while, still no complaints.
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M1combat
Posted on Tuesday, September 04, 2012 - 08:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

And people thought I recommend Drummer because Kevin gave me one of his prototypes way back when...

No...


That's why.
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