Does an exhaust leak affect dyno tune? : Yamaha R1 Forum
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Old 05-21-2006, 05:23 PM   #1
knee_draggerR1
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Does an exhaust leak affect dyno tune?

I just bought a Termi Y-pipe that claimed to mate up to any slip on that utilizes the factory y-pipe. The left side outlet is several mm too small in overall diameter and fits loosely into my slip-on, which is a D&D. I caked high heat gasket maker inside my slip-on, and it helped but, some of the seal blew out and there is still a slight leak around the pipe. I am planning on having my bike tuned in the next week or so and my question is this, will my bike suffer during the tune from having a slight exhaust leak? By slight, Iíd say itís like a pinhole, you canít really feel it until the bike revs, then you can feel exhaust blowing through the seams. Any input would be appreciated
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Old 05-21-2006, 05:36 PM   #2
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Re: Does an exhaust leak affect dyno tune?

Quote:
Originally posted by knee_draggerR1
I just bought a Termi Y-pipe that claimed to mate up to any slip on that utilizes the factory y-pipe. The left side outlet is several mm too small in overall diameter and fits loosely into my slip-on, which is a D&D. I caked high heat gasket maker inside my slip-on, and it helped but, some of the seal blew out and there is still a slight leak around the pipe. I am planning on having my bike tuned in the next week or so and my question is this, will my bike suffer during the tune from having a slight exhaust leak? By slight, Iíd say itís like a pinhole, you canít really feel it until the bike revs, then you can feel exhaust blowing through the seams. Any input would be appreciated
I would have to say "Yeah" it could effect it. I would wait till you find a work around the leak to get it dyno tuned. It costs too much to do to take a chance.

Also, the blow-by will start to discolor the pipe and anything near it in short order. You may not want to take the chance on that either?

Good Luck mang!
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Old 05-21-2006, 05:39 PM   #3
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yes because the leak causes turbulence and isrupts the exhaust stream bla bla bla, but how much i dont know
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Old 05-21-2006, 06:06 PM   #4
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is sure does!!
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Old 05-21-2006, 06:20 PM   #5
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Yep, it'll hurt you. You won' t have the back pressure. The exhaust is like a wind instrument. It's tuned to get you a paticular performance that you would want. By having a leak, is like pushing a valve, which changes notes/tune. Now the numbers you were looking for won't be there.
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