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Hootowl
| | Posted on Friday, July 23, 2010 - 05:17 pm: | 
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Those questions were answered. If the unasked questions got answered too, and it upsets you that much, perhaps this isn't the place for you. I hate to see anyone storm off, but that's up to you I suppose. Just know that there was no malice in anyone's responses. |
Sticks
| | Posted on Friday, July 23, 2010 - 09:32 pm: |
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Once saw a bolt that had pipes that ran up and ended in a under tail. There was no muffler, just acres of pipe. I couldn't say how it ran. I didn't hear it but I'd imagine it was a fair bit louder than stock. |
Strato9r
| | Posted on Saturday, July 24, 2010 - 01:30 am: |
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It could work, but I would do my homework as far as tubing length and diameter, as well as collector and tailpipe design. If those things are actually working with the camshaft profile, and the fuel map is sorted out, it can be just fine, and not as loud as it could be, as the energy of the exiting exhaust is actually being used to draw the next charge out of the cylinder. "Back pressure", per se, is not a requirement of an exhaust system, but the average pressure within an exhaust pipe, from the spike of pressure just after the exhaust valve opens to the drop in pressure as the wave exits the pipe, and is usually slightly higher than atmospheric pressure. There are some pretty good formulas online that deal with proper exhaust system design, with a really good one on one of the BMW Airhead sites; I'm not certain of the exact location, but just type "BMW snowbum" into your search engine and you should get to it pretty easily. Beyond that, I think that dialing in the ECU for proper mixture would be the toughest thing to sort out. |
Guell
| | Posted on Saturday, July 24, 2010 - 06:24 pm: |
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Have you considered getting a d&d pipe? You wont loose torque like a straight pipe, and they are still fairly noisy. Just a thought. |
Im_joedirt
| | Posted on Saturday, July 24, 2010 - 09:31 pm: |
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I wasnt really thinking about it for the extra noise, although it would as loud as hell, just something different, but if i am going to lose alot of performance then its probably not worth it, unless i find someone to tune it properly. |
L8_br8ker
| | Posted on Sunday, July 25, 2010 - 10:01 am: |
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No one I have heard of (except serious drag racers, that run 1/4 mile or 1/8), has gotten a straight pipe setup to run decently for the street, although in theory it should work, at the correct tuning. Buell engines run better with a little back pressure (someone will disagree here, but won't be able to show a street example of a Buell with natural aspiration, that runs reasonably well with straight pipes), they run really poorly., to get the loud sound , I would go d+d, (the performance on the d+d is not great, but they do run enough to be on the street.
If you want a sweet sound, go Drummer, or Spec Opps, very tunable. there is a carb fed Sportster in my neighborhood with straight pipes that runs ok, its a very modified engine. I spoke to the guy, He said it does not have the power it had with mufflers, but He likes the look and sound, and that tuning was a difficult process.
You probably could get the bike to run with straight pipes, but it wont be cheap or easy, and you'll most likely give up a lot of performance when its set up best it can be |
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