Question about Exhaust - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 10 (permalink) Old 11-08-2008, 08:52 PM Thread Starter
 
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Question about Exhaust

I just love the sound of a bike when you take the exhaust pipe off..

http://www.youtube.com/watch?v=HBfTdgPNb7o

I know that you can buy MotoGp Exhaust pipes so it sounds just like there is no exhaust, can you put them on even though the exhaust pipe leads under the tail like a Yamaha R1, or can it only be on the side.

And what would be a good brand to buy?

Thanks.
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post #2 of 10 (permalink) Old 11-08-2008, 10:31 PM
 
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what type of bike do you have?


there is the hotbodies undertail exhaust....
http://www.1tail.com/sa/cart/detail.asp?pg={4F11A795-7C1D-4DB4-9904-53A4E178DED0}
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post #3 of 10 (permalink) Old 11-08-2008, 10:39 PM Thread Starter
 
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The exact bike you linked it for, lol!!

Its really neat it give you a plastic undertail.

Hotbodies any good?
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post #4 of 10 (permalink) Old 11-08-2008, 10:56 PM
 
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well i was going to buy a 636, but instead got a buell XB12R, and was planning to get htat very setup, i saw one passing by not too long ago, it was freaking sweet

but sorry to say, i think it has been discontinued.... :\
but you can try to find it on ebay or whatever

linky to the whole hotbodies undertail lineup
http://www.1tail.com/sa/cart/found.a...ertail+exhaust

Last edited by ochoa0042; 11-08-2008 at 10:59 PM.
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post #5 of 10 (permalink) Old 11-08-2008, 11:28 PM Thread Starter
 
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I thought it said the color red was discontinued.

i don't know why more people don't use them, makes your bike sound like an F1 car and its super loud.
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post #6 of 10 (permalink) Old 11-09-2008, 12:50 PM
 
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Gomorrah,
Well, you're making a few mistakes here. As a general rule, the louder the pipe the less the power. I have my own Dyno and I've installed a couple hundred headers systems by now. A system needs backpressure or a reduced diameter or constriction to be effective throughout the rev range. Air goes both ways in an exhaust system and the bigger the pipe the greater amount of ambient air that's going to go the wrong way (back up the pipe). When you install a nice big fat (and short) pipe / muffler setup you are only making things worse. In many cases we see a loss of more than 10 HP by doing this.
Also, generating the most noise possible will only bring the Law (government) down on you and the rest of us too. When I was a kid I used to yank off my muffler on occassion only to discover that I rode much slower than with a muffler installed. I didn't like to alert every cop withing 5 miles that I was comming his way. Cut the noise and enjoy the bike's performance.
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post #7 of 10 (permalink) Old 11-09-2008, 01:11 PM Thread Starter
 
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Quote:
Originally Posted by DaveL View Post
Gomorrah,
Well, you're making a few mistakes here. As a general rule, the louder the pipe the less the power. I have my own Dyno and I've installed a couple hundred headers systems by now. A system needs backpressure or a reduced diameter or constriction to be effective throughout the rev range. Air goes both ways in an exhaust system and the bigger the pipe the greater amount of ambient air that's going to go the wrong way (back up the pipe). When you install a nice big fat (and short) pipe / muffler setup you are only making things worse. In many cases we see a loss of more than 10 HP by doing this.
Also, generating the most noise possible will only bring the Law (government) down on you and the rest of us too. When I was a kid I used to yank off my muffler on occassion only to discover that I rode much slower than with a muffler installed. I didn't like to alert every cop withing 5 miles that I was comming his way. Cut the noise and enjoy the bike's performance.
I had no idea it did that to the bikes performance. I asked a guy before I posted and hey said it adds HP, haha.

Thanks.
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post #8 of 10 (permalink) Old 11-10-2008, 04:58 AM
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Dave would know, and the effect on police attention can't be dismissed either.

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post #9 of 10 (permalink) Old 11-10-2008, 02:55 PM
 
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Another good point, Gomorrah. Just about every manufacturer will make some sort of claim of performance gains. There's no 'truth in advertising' on any of these products and a claim on 12 HP sells more product than a claim of only 3 or 4. Most of us like the idea of making a big improvement and it makes us feel better about all the money we spent. I wrote an article a few years ago for a cycle magazine and I've included it on my Company web site. It's too long to place here, but you might give it a quick read. It's on the Dyno tab at [pcwatlanta.com].
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post #10 of 10 (permalink) Old 11-10-2008, 04:20 PM
 
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Another thing about power gains, is view the dyno chart, don't just look at a number. less restrictive systems often add power near the very peak, right at redline, but reduce power over the rest of the range



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