Need help finding a somewhat QUIET but powerful exhaust! - Page 2 - BMW S1000RR Forums: BMW Sportbike Forum
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Old 11-28-2012, 10:49 PM   #11 (permalink)
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Originally Posted by Rudehugh View Post
On a side note, what RPMs do you guys usually cruise at if not riding aggressively? I find myself between 4k-8k.

What is a healthy RPM range to downshift to?
If I'm just cruising I'll be between 4k-5k. If I'm amidst other cars on the freeway I'll be at 6k-8k.......just incase I need to gun it to avoid some idiot swerving into my lane or something. 8k sounds high to me if you're just cruising.

As for downshifting, that tends to raise RPMs.....unless you were breaking significantly also. Not sure what you mean by "healthy RPM range". Can you elaborate?

Last edited by HULK; 11-28-2012 at 10:51 PM.
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Old 11-28-2012, 11:13 PM   #12 (permalink)
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Right now I am debating between arrow and tayloremade. I am not looking for more power. I want to lose the weight and perhaps little bit louder so that cars can hear me. I also like the clean look that you get from both of these exhausts.


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Old 11-29-2012, 12:21 AM   #13 (permalink)
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I want to lose the weight and perhaps little bit louder so that cars can hear me.
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This will not effectively help cars hear you....unless you are already passing or in front of them. Physics dictates this. "Loud pipes saves lives" is a myth. Learning to maneuver better through traffic, improving peripheral scanning, staying alert, and improving your reflexes on the other hand are very useful.
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Old 11-29-2012, 05:16 AM   #14 (permalink)
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Originally Posted by HULK View Post
This will not effectively help cars hear you....unless you are already passing or in front of them. Physics dictates this. "Loud pipes saves lives" is a myth. Learning to maneuver better through traffic, improving peripheral scanning, staying alert, and improving your reflexes on the other hand are very useful.
not true. i came from stock to an arrow shorty. they hear me riding behind them, and when riding next to them on trafic jams they hear me comming closer so they make room to let me pass. when riding stock under 5k they didn't hear me comming. unless u can ride faster then aprox 330m/s they will hear u

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Old 11-29-2012, 07:56 AM   #15 (permalink)
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I think the reaction to have more power is just that, a reaction man kind has been doing for 100's of years. With that being said, finding an exhaust from an HP4 might be an option, as it has a Arko long can and is about 7Lbs lighter.

And I'm more interesting in loosing weight then anything else, I already ride around on my bike like it's a 600, but I sure look good doing it!

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Old 11-29-2012, 02:10 PM   #16 (permalink)
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Quote:
Originally Posted by HULK View Post
If I'm just cruising I'll be between 4k-5k. If I'm amidst other cars on the freeway I'll be at 6k-8k.......just incase I need to gun it to avoid some idiot swerving into my lane or something. 8k sounds high to me if you're just cruising.

As for downshifting, that tends to raise RPMs.....unless you were breaking significantly also. Not sure what you mean by "healthy RPM range". Can you elaborate?
I think that you nailed it, Hulk.

So to recap- your riding stays <8k for normal cruising?


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Old 11-29-2012, 02:52 PM   #17 (permalink)
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not true. i came from stock to an arrow shorty. they hear me riding behind them, and when riding next to them on trafic jams they hear me comming closer so they make room to let me pass. when riding stock under 5k they didn't hear me comming. unless u can ride faster then aprox 330m/s they will hear u

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How do you know the cars that move over for you heard you and didn't simply see your headlights coming? If traffic is very slow or stopped, and the drivers don't have their radios on or some other form of distraction, then yes there is a chance they'll hear you. But driving at speed, especially on the freeway, they won't hear you until you are passing them.

Haven't you ever been driving then are surprised at the loud ass bike that is suddenly next to/passing you? Happens all the time. I found the following online which explains it pretty well:
------------------------
It's rooted in physics. Unlike an earthquake, which emits waves in a sphere away from its epicenter, sound waves can be directed. (A good example of this a megaphone: if sound waves were not directionally sensitive, megaphone users would all be deaf.) The pressure wave emitted from an exhaust pipe is pointed away from and behind the motorcycle. To hear it from anywhere other than directly behind the bike, you rely on the resonance of the pipes and reflection of the sound waves off of other objects, like cars, signs, buildings, etc.

In other words, the only time the loud pipes draw attention to a motorcycle in traffic is when the bike is facing away from the motorist. In most cases, facing away from the motorist means riding away from the motorist: increasing the separation of bike and potential hazard. The only possible situation in which a car can pose an external threat to a motorcyclist when the bike is facing away from the car is if the motorist is backing up or (following) behind the rider. The threat exists, but only marginally: the Hurt Study found that a whopping three percent of accident hazards come directly from the rear (or the "six o'clock" direction).

Conversely, Hurt found that 77% of all accident hazards approach the motorcycle from in front of the rider (specifically, the eleven to one o'clock range). To have any chance of alerting those motorists to the presence of a motorcycle with exhaust noise would require that the tailpipe be pointed forward. The chances of rearward-facing straight pipes making a bike more obvious are very slim. The reality of the loud pipe is that all you'll succeed in doing is irritating all the people behind and beside you who don't pose much of a threat anyway.
---------------------

I know this is a highly debated topic, and for the record I'm definitely not against aftermarket pipes. I just don't believe they significantly improve drivers ability to hear you coming. To each his own......we can agree to disagree

Rudehugh> yep, definitely below 8k for cruising.

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Old 11-29-2012, 03:05 PM   #18 (permalink)
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Haha!


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Old 11-29-2012, 03:59 PM   #19 (permalink)
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I have the Austin Racing system it is awesome. It is not quiet by any stretch, but it has an awesome sound! No baffles and it opens up like a Apache helicopter on roids!
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Old 11-29-2012, 04:49 PM   #20 (permalink)
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I have the Austin Racing system it is awesome. It is not quiet by any stretch, but it has an awesome sound! No baffles and it opens up like a Apache helicopter on roids!
You have the short can though, right? Long can would be quieter?

What seat is that?


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