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 Stealthy performance exhaust

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sswrx

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PostSubject: Stealthy performance exhaust   Sun Mar 07, 2010 12:44 am

Since switching from a 600cc sportbike to the WR, I've missed the near silent purr of the inline 4 with the stock can. The WR is my first thumper & is more fun to ride despite the decrease in the HP department. I've done almost all the mods short of the Athena big bore & MP turbo. I wanted to know if anyone has tried putting a DB Dawg into their FMF Q4 to reduce the DB level even more? I like the tone of the Q4 over the stock system, which was not really quiet to begin with & sounded poppy at idle & tinny at highway speed. I've seen a mod on DR650's that use a stock GSXR muffler which gives it a deep idle but quiet tone at higher speed. Sounded really mellow on Youtube. Anyone got any expertise with the DB Dawg or custom exhaust adaptations?
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toast




PostSubject: Re: Stealthy performance exhaust   Sun Mar 07, 2010 4:20 am

http://www.advrider.com/forums/showthread.php?p=10527241&highlight=insert#post10527241

Cyborg put a 1x3/4" copper pipe adapter in the end of his spark arrestor and that quieted things down. Do you have the powerbomb header also? I found that my bike is quieter with the Q4 and powerbomb than with just the Q4.
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sswrx

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PostSubject: Re: Stealthy performance exhaust   Sun Mar 07, 2010 9:05 am

Thanks Toast. I do have the Power Bomb installed also. Strange thing I wondered about it was how it could influence exhaust performance because if you look into it, the area where the chamber is shows nothing different internally except for a little pea sized hole on the bottom of the tube about center of the "bomb" area. Anyway, I'm heading to the hardware store today & trying the copper pipe adapter. It will be a cheap experiment. I'll try to post results after testing.
toast wrote:
http://www.advrider.com/forums/showthread.php?p=10527241&highlight=insert#post10527241

Cyborg put a 1x3/4" copper pipe adapter in the end of his spark arrestor and that quieted things down. Do you have the powerbomb header also? I found that my bike is quieter with the Q4 and powerbomb than with just the Q4.
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SheWolf
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PostSubject: Re: Stealthy performance exhaust   Sun Mar 07, 2010 2:54 pm

Mark (mwakey) put a Db Dawg in his Q4 but he had to modify it to make it fit. Not sure if he's still using it with the can or not.

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A wolf's voice echoed down the mountain 'Share the bounty of the hunt with your brothers and sisters, and forever be strong and free.'
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toast




PostSubject: Re: Stealthy performance exhaust   Sun Mar 07, 2010 7:20 pm

sswrx wrote:
Thanks Toast. I do have the Power Bomb installed also. Strange thing I wondered about it was how it could influence exhaust performance because if you look into it, the area where the chamber is shows nothing different internally except for a little pea sized hole on the bottom of the tube about center of the "bomb" area. Anyway, I'm heading to the hardware store today & trying the copper pipe adapter. It will be a cheap experiment. I'll try to post results after testing.

Air flow and sound don't have to be mutually inclusive - the expansion chamber is designed to damp some of the sound waves while allowing full exhaust flow.
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mwakey

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PostSubject: Re: Stealthy performance exhaust   Sun Mar 07, 2010 8:11 pm

http://wr250rforum.forumotion.com/maintenance-f2/repacking-the-fmf-silencers-t409.htm

If you are into reading my LONG rant about FMF customer service, there is also info in there about my Q4/dB Dawg experiment. One of the posts has a link to a TT thread with more info. I am not running the dB Dawg right now, but I still have it. When I bought it I had just repacked the Q4, so it was not a fair test with the new packing going in at the same time I installed the Dawg. I think now that I have some miles on the new packing I might try the Dawg again just to see what it does. I didn't have it in very long the first time. It did quiet the bike at idle and slow speeds but I didn't notice any change on the highway. The Dawg seemed to give it more pep in the upper end though, but like I said I just repacked so I may have got a false reading there.
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sswrx

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PostSubject: Re: Stealthy performance exhaust   Fri Mar 12, 2010 12:05 am

I went crazy at the plumbing section at LOWES & came home with about $15 worth of copper adapters. I thought I'd reinvent the wheel & attempted to make a crude version of the DB Dawg & it failed. I replaced my spark arrestor with it & it sounded like crap. No quieter than before & an awful sound like farts in a 5 gallon bucket. I think I'll just get the same 1" to 3/4" adapter & see what it sounds like.
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SheWolf
Alpha Rider
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PostSubject: Re: Stealthy performance exhaust   Fri Mar 12, 2010 12:07 am

Kind of like those cans they put on the end of many young 'stud muffin's' rice grinders....

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A wolf's voice echoed down the mountain 'Share the bounty of the hunt with your brothers and sisters, and forever be strong and free.'
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sswrx

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PostSubject: Re: Stealthy performance exhaust   Sat Mar 20, 2010 8:40 pm

Oh yeah, you must be referring to the FAST & FURIOUS TUNER CARS.
SheWolf wrote:
Kind of like those cans they put on the end of many young 'stud muffin's' rice grinders....
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0007onWR

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PostSubject: Re: Stealthy performance exhaust   Wed Mar 24, 2010 11:29 pm

LOL
I gotta go find a 5 gallon bucket so i can see what sound you refer to
5 imperial gallons or US?
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