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Silentsniper
Posted on Friday, August 03, 2007 - 12:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

New To This Board, Can someone tell me what the results would be if you were to run a XB-9r with open headers, I saw a guy the other day running his like this and it made the sound of the four horseman at idle and nuclear destruction when leaving. He told me that he has not replaced the ecm and has had no issues with it,
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No_rice
Posted on Friday, August 03, 2007 - 02:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

um, fried valves at least if not more. i wouldnt do it
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Luxor
Posted on Friday, August 03, 2007 - 02:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Open headers NO, NO ,NO. You WILL burn valves and crack heads, and many other BAD things.

Now, a tuned straight pipe is another story.
This is an OLD drag racer trick.
Take a piece of pipe a few feet long, make a collector so you can mount it the the header. Now paint the pipe white with low temp paint. Start the bike and let in warm up to operating temp. You will see the paint on the pipe burn away. Cut the pipe just past the burn and you now have a tuned header. No risk of hurting the motor with this type of straight pipe. Also be aware that the Buell muffler is a tuned setup, and you will most likely lose HP or torque if you run a straight pipe.

AHH, and WELCOME to the BadWeb: ): )

(Message edited by luxor on August 03, 2007)
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New12r
Posted on Friday, August 03, 2007 - 02:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Welcome.

Dude is a fool running an open header, as stated above you will burn the valves.

Buy a pipe if you want it louder.

Just my .o2 but straight pipes are useless....they are way to loud, create more attn. than necessary to the local authorities, and unless you ride wide open throttle everywhere you go you have wasted the potential of the motor.
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Djkaplan
Posted on Friday, August 03, 2007 - 02:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

"Can someone tell me what the results would be if you were to run a XB-9r with open headers...

Your neighbors will be mad, you'll gasp for breath at stop lights, your ears will ring, you'll become sterile, your 401k will tank, women will find you unattractive, that promotion you were counting on, forget it, and if you believe in God, he's going to be really mad at you. If you don't believe in God... he (she?) is really, really going to be mad at you.

You just don't need that kind of trouble.
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Silentsniper
Posted on Friday, August 03, 2007 - 03:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I figured on the burning valve part, and the post of God and 401 k, had me laughing,This is the most informative board out there and I like reading and seeing the pics and posts on here, many ideas have come from thic board.
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Forerunner
Posted on Friday, August 03, 2007 - 05:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

So, can someone explain how the extra 2' or so of exhaust tubing that comes from having a muffler in addition to the headers prevent valve burning?

Also, how does a valve burn from running open headers?

Thanks,
Nels
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Jaimec
Posted on Friday, August 03, 2007 - 05:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I remember Kevin Cameron explaining tuned exhausts, why you WANT back pressure, and many other important reasons why you DON'T want a straight pipe. A lot of it was over my head, but the stuff that wasn't made a lot of sense.

In any event, you'll need someone with that level of expertise to explain it fully and properly. That ain't me.
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Sloppy
Posted on Friday, August 03, 2007 - 09:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I ran without my muffler at a no-dB limit track. Yikes she was loud! I put the muffler back on because I was loosing my concentration. Sure is a great way of having the track to yourself though...

Just because you don't run without a muffler doesn't mean you don't have backpressure -- it's just less backpressure. It's the same concept as a "high flow aftermarket slip on", no? You just have to make sure it's jetted properly.

I've heard the "you can burn your exhaust valve" rumor many times, but no one's been able to show me pictures (not saying it's not true, but I've never seen it). As long as the fuel is optimized so you don't run too lean due to the higher air flow then I would figure you'd be okay -- at least that's what the GP bikes do, isn't it?

Just make sure you do it at a race track, not the street. No one likes an a**hole, except a g*y d*ck...
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Glitch
Posted on Friday, August 03, 2007 - 09:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Also, how does a valve burn from running open headers?
The main reason is not back pressure.
What happens is with out the muffler the engine breaths out more than it's taking in.
So without tuning the engine to run open headers, the engine runs way lean.
Lean equals a lot of heat.
The exhaust valves being the hottest part, means they'll be the first to disintegrate.
You could run open headers if you wanted, without damage, you'd have to re-tune the engine, and add lots of gas into the mixture.
But, like New12r said, it would only make power in the upper rev range.
That's why you see drag racers run open headers, they most always run wide assed open.
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Glitch
Posted on Friday, August 03, 2007 - 09:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Besides you'd have to change your handle from Silentsniper to Loudass
Welcome to the board.
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Diablobrian
Posted on Friday, August 03, 2007 - 10:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

welcome...and what they said.... Too loud bad, open pipe bad for torque and anything but top end, need to tune ECM
via direct link to optimize with that set-up on the dyno.

In general it's a bad idea for anyone except those dying to emulate the sound of the local chrome wagons as they
gather in preparation for the next poser...I mean poker..run.
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Forerunner
Posted on Saturday, August 04, 2007 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I guess I'm still not understanding how the extra length from a muffler makes the difference between running lean and not.

Did Buell really design that small a tolerance in the A/F ratio?

If you're running a stock intake, can you really get that much airflow through the motor to run lean by opening up the exhaust?

Thanks,
Nels
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Jkhawaii
Posted on Saturday, August 04, 2007 - 05:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

lets see some dyno and afr readings
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Diablobrian
Posted on Saturday, August 04, 2007 - 11:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

the a/f ratio really is that tight on emission controlled vehicles...like all Buells.

It is very easy to upset the balance. an aftermarket air filter makes your bike run lean, but not really dangerously. If you
add an aftermarket exhaust to the air filter, or open airbox and the bike is suddenly way too lean.
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Glitch
Posted on Sunday, August 05, 2007 - 11:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Lots and lots of good information can be read in the KV.
Lots of good info in there.
Y'all ought to check it out.
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