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PostPosted: Mon Nov 07, 2016 3:02 pm 
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Adventure Rider
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Joined: Wed Mar 30, 2011 2:01 pm
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Location: Apex, NC
Max Kool wrote:
Kodachrome wrote:
since there are 2 maintenance free mufflers out there now, i would really like to understand the pros and cons of each. the leo vince vs tis precycle one. I would also love to hear the sound of this one


Three actually.


Four...stock, GSXR mufflers (40F0, 35F0, etc..), Leo Vance and now ProCycle

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PostPosted: Mon Nov 07, 2016 3:13 pm 
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Ha! yes

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PostPosted: Mon Nov 07, 2016 10:23 pm 
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Location: Denmark WA
You all forgetting the Marving.

May be hard to find in the States but no harder to get for the rest of the world than the pro cycle.


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PostPosted: Mon Nov 07, 2016 11:25 pm 
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Yep Marving. I liked it!

Only downside of the Marving: it's chromed mild steel. So keep it clean and polished.

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PostPosted: Mon Nov 07, 2016 11:31 pm 
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Max Kool wrote:
Yep Marving. I liked it!

Only downside of the Marving: it's chromed mild steel. So keep it clean and polished.

Am I the only person who, looking at the marving photos, thinks maybe it also has a rather small outlet? Just doesn't look very big to me.

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PostPosted: Mon Nov 07, 2016 11:41 pm 
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It is small, that's true (is that a no-go??). And it's quiet.

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PostPosted: Tue Nov 08, 2016 6:15 am 
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Max Kool wrote:
It is small, that's true (is that a no-go??)

Maybe, maybe not, it's a question of how restrictive it is.
I recall a post, possibly on this thread, asking whether a particular muffler flowed better or worse than another. I thought little, at the time, about the reply, which was along the lines of "how would we measure?"
It occurs to me that there is a way to evaluate the relative flow rates of different mufflers.

Take a stock mid-pipe, weld a spigot on it about 2/3 the way along the straightest section. Connect a one side o a u-tube manometer to this spigot.
Fit a muffler/mid pipe combo. Fire up the bike and let it idle.
Set the idle speed to 1500.
Note the inches of water generated by the back pressure at idle.
Do the same with every muffler/midpipe combo you have.

Biggest inches of water number = most restriction.
Lowest inches of water = least.

There are a few variables to take into account, in particular exhaust temperature. Gases expand. PV=nRT.
I'll have to think about that one some more.
Maybe just let it idle and take all pressure readings at the same temperature?

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PostPosted: Wed Nov 09, 2016 6:14 am 
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I would send this as a PM to Jeff but since no such option I'll post it here - please do not take it as a starting point for forum rules disrespecting posts - this comment is only meant to provoke a smile or two:

"Jeff, after certain recent developments over there, I now know why you designed such a sturdy part suitable for the mighty DR in its proverbial Post-Apocalypse Bike status :s_yes ".

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PostPosted: Wed Nov 09, 2016 9:57 pm 
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Joined: Sun Feb 07, 2016 11:35 am
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Location: Inland Empire PNW Washington, USA
Jeff,
great info on your site about DB's. I'm fairly new to the DR world here. first year and PC has helped me sort out some issues. I currently have a Q4, stock carb/ air box mod/ K&N with a DJ kit running 150 main Mikuni jet.
here's my questions, on your website it states that a 3 db difference is approximately twice the sound energy. would you say that the Pc muffler is twice as quite as the Q4? the reason I asks is that the Q4 is a bit loud for my taste, plus I don't like packing silencers. second what would you think I'd have to do if anything with the jetting? I'd expect to give up some flow since the FMF is basically a straight through affair. I'm okay with that as a no maintenance system is :2_thumbsup:
any insight would be appreciated.


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PostPosted: Wed Nov 09, 2016 11:35 pm 
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DeeRTom wrote:
...would you say that the Pc muffler is twice as quiet as the Q4? ...
Yes, or half as loud :s_smile
The thing about the dB scale it's far from linear. Every 3 points doubles the sound. But... our hearing is non-linear in the opposite direction. If it wasn't we would not be able to hear any soft sounds. So, any comparison I say like "sounds half as loud" is purely subjective. The SS1 is a bit louder than stock but more than a bit quieter than a Q4.

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