Not the Sound of Silence...

[Dune Dude]

Here is some cool information I found while surfing the net.  I just wish they had updated it since 2002.


   
 
   
Sound Limits in the Dunes National Recreation Area



What’s the sound limit at the Oregon Dunes?
Vehicles operating at the Oregon Dunes NRA must be 93dB or less.


Have Your Vehicle Checked!
You can request a sound test before riding, call ahead to schedule an appointment with the Oregon Dunes Sound Crew.

The Sound Test…
As defined by state and federal law, vehicle sound is measured by a decibel meter 20 inches and 45 degrees for the exhaust outlet. ATVs and motorcycles are tested at 50% of the manufacture’s RPM recommendation. Class II vehicles are tested at 75% of the engine’s maximum RPM.

Decibel outputs based in 2001 data collected during monitoring and law enforcement stops.


What Works...
Stock is (almost) always best! (Honda 250R) We recommend that you operate with your vehicle’s stock pipe and muffler and maintain it in good working condition. Regardless of what you purchase for your ATV, you are still responsible for ensuring that it meets the requirements of the law. Not all mufflers will work the same on all OHV’s. Since results vary with modifications, along with vehicle care and maintenance, we cannot guarantee that these mufflers will work on your particular ATV



U.S. Forest Service Oregon Dunes NRA
855 Highway 101
Reedsport, OR
(541) 271-3611
 
 Sound Monitoring Data VEHICLE MUFFLER MODIFICATION AVERAGE DECIBLE OUTPUT AVERAGE DECIBLE OUTPUT
2002
Raptor Stock  88.5* 91*
 White Bro.  99.5 101
 FMF  97.3 
 Yoshimura   100
     
Banshee Stock  88.0* 89*
 Toomey Hush Kit 89.2* 93*
 Cascades CSFX 89.6* 92*
 FMF PC II 90.0* 91*
 LRD  91.0* 
 Pro Circuit  97.3 96
 Toomey  98.9 100
 Toomey T-5 99.5 100
     
YZ 426 STK   102
 WB   101
 FMF   106
     
Honda
250R STK   93*
 CSFX   94
 LRD (quiet)   91*
 FMF PC   99
 FMF   101
     
Honda 400EX Stock  87.0* 89*
 FMFTC2/PC4  99.9 102
 FMF-Q   94
 DG  100.0 
 White Bro.  100.8 100
 Pro Circuit  101.0 
     
Honda
CRF 450 STK   98
     
Warrior Stock  87.9* 89*
 Supper Trap  96.8 97
 White Bro.  99.5 101
     
Bombardier Stock  91.4* 93*
 Big Gun  102.0 101
 Supper Trap  102 
 White Bros.  104 
 Rotax  105.5 
     
Suzuki
Z400 STK   92*
 Yoshimura   99
 
 * On the average these vehicles meet the 93 decible limit
Information provided by the Oregon Dunes National Recreation Area.
   
       

[RTOYZ]

good posting, I can't believe that a stock Z400 is 92db's. I wonder what mine is when the wisper tip blows off!

[Dune Dude]

I am going to check with Angie from the Forestry to see if they have any more up to date information.  The information listed above does show a stock pipe but, it does not say how old the bike and pipe were when tested or what shape they were in.  We all know after time even the stock pipes get louder than they were when new.
Posted on: October 22, 2007, 07:55:07 PMAs promised here is the latest info from the USFS on data collection of exhaust db in the dunes.  This info is from 2005 and Angie promised me the latest and greatest when she gets it compiled.

2005 Averages at the Oregon Dunes
After Market Exhausts & Quiet Alternatives
Dunes Sound Limit is 93 Decibels
Average db   Number tested   Exhaust and Quiet Options
88*   545   Stock
100   6   Alien (by DMC) No longer made
102   14   Big Gun:  silencers, repacking kits
93*   6   Cascade
99   17   CPI
98   19   DRD:  Quiet cores available
95   117   FMF:  Silencers, quiet core inserts, tunable disc system
100   12   GYTR:  Silencers available
99   26   LRD:  Silencers available for both
Yamaha and Honda
95   28   Pro Circuit:  Silencers available
98   11   SuperTrapp
99   71   Toomey:  Silencers available
93*   7   Toomey Hush
*Within Dunes Sound Limit of 93 decibels

[Sandflicker]

Or, for something really loud, put Jeanne at the top of a razor back and tell her we have to go down it!!!
Posted on: October 26, 2007, 12:57:22 PMhttp://www.oohva.org/

The link above has some great information regarding the sound issue.

[Joe Llamahead]

The dune patrol does free sound checks and we are NOT law enforcement so we DON"T write tickets. Just FYI for folks that want to comply.  Usually camped at the campsite at the entrance to houser road @ horsefall. look for the free sound check sign. we/they're not there every weekend though.