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Old 01-21-2010, 07:35 AM   #61
Yellow Pig OP
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A Key Note on dB:

First, remember that the decibel (dB) is a logarithmic unit,
meaning that you cannot add and subtract dB like ordinary numbers. For
example, an increase of 3 dB is a doubling of the "strength" of the sound,
and an increase of 10 dB means that the
sound is 10 times as loud; i.e., 70 dB is 10 times as loud as 60 dB."

So a change of +/- 4 dB is significant.
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Yellow Pig screwed with this post 01-21-2010 at 11:14 AM
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Old 01-21-2010, 11:11 AM   #62
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Not to detour your thread here but it appears you have your priorities mixed up according to the OHV vehicle regulations for the state of Colorado.

According to the law you must have a "muffler in constant operation and properly maintained. A muffler is a device consisting of a series of chamber or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and is effective in reducing noise." There is not mention of db rating.

However more importantly and so you don't torch your favorite ride area and all those hikers on foot you must have exhaust that "is equipped with a spark arrestor in good working order which has been approved by the U.S. Forest Service as evidenced by the bona fide permanent marking of “qualified” or “approved” on the spark arrestor. A spark arrestor is a device which traps or pulverizes exhaust particles as the are expelled from an internal combustion engine exhaust system and is effective in reducing exhaust sparks and protecting against exhaust spark fires."

http://parks.state.co.us/OHVsandSnow...egulations.htm


Now I'm not sure how you get your forestery approved spark arrestor back in the end of the can with your db silencer but it appears the local law might have their way with you sometime soon.




Where does the sparky go?




Yet we still haven't debated the overly rich fuel metering system spewing "pollution" out into the atmosphere while operating your engine mapped for free flowing spark arrested exhaust and running excesively rich with its pipe stuffed.
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Old 01-21-2010, 11:21 AM   #63
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Touché!



I have wired a spark screen on the dB killer (sleeved over like a condom) and run a PC-V w/ Autotune and a wide band O2 sensor to adjust my AFR on the fly.

Plus I think the whole spark arrestor issue is a leftover of the leaded gas era, the newer ethanol laced fuels do not spark.

Bottom line is I just don't like loud pipes. After a long day of riding, even with ear plugs, the louder pipes hurts my ears. Don't get me wrong. I do not want a BMW sewing machine type bike. I do like my bike to have a bit of tone, just not too loud.

Rude riding behavior, riding off trail and loud noises are the first thing that catch the anti OHV crowds attention.
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Old 01-21-2010, 11:44 AM   #64
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Quote:
Originally Posted by Yellow Pig
Bottom line is I just don't like loud pipes. After a long day of riding, even with ear plugs, the louder pipes hurts my ears. Don't get me wrong. I do not want a BMW sewing machine type bike. I do like my bike to have a bit of tone, just not too loud.
I can understand that. It can get loud enough to where you cannot hear yourself think.
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Old 01-21-2010, 02:58 PM   #65
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Its weird how diff bikes make different noises. My friends 09 ktm 530 even with spark arrestor out and the pipe widened its way quieter then my husky. I think that has to do with the actual engine though. I plan on tac welding the screen on the end of the db killer as well. The pipe still says forest service approved so I should be good.
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Old 01-23-2010, 04:13 PM   #66
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So I received my Db killer for my 2009 TE510. I used my Iphone and set it on a bike about 4 feet away from the bike and did 3 recordings. One stock, one with the spark arrestor removed and one with the db killer insert. its not perfect but its a good example for anyone currious how it sounds.



With nothing. Spark arrestor removed

http://www.zshare.net/download/715834367c942b3e/


With DB killer
http://www.zshare.net/download/715832550f520a82/



Does anyone know a better way to host audio files? id rather stream it ver host DL. youtube didnt work.
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Jrmobb screwed with this post 01-24-2010 at 12:33 PM
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Old 01-23-2010, 05:04 PM   #67
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Quote:
Originally Posted by Jrmobb
Stock setup, spark arrestor insert
http://www.zshare.net/download/71583484d5f2a2a6/
Hey, they got rid of mr chirpy. Kinda.
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Old 01-23-2010, 05:09 PM   #68
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Wait.. I kinda got the same sound file on each link.
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Old 01-24-2010, 12:36 PM   #69
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opps, I think I uploaded wrong one for the stock spark arrestor. I just deleted link im 2 lazy to upload it lol
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Old 01-24-2010, 01:58 PM   #70
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If you can get a hold of a sound meter, the correct way to measure is 18 inches from the end of the pipe at a 45 degree angle. The area away from the pipe should be open so that sound cannot reflect and bounce back.

Readings are taken at 1/2 peak hp RPM. That is where manufacterers cheat the system. Some have an ignition curve only for sound checks. If there is no load on the motor, the curve is set for quiet readings.

Currently, AMA off road events bikes most test at 96 db. In our district, if someone protests another bike after an event, it will be sound checked and if it does not pass, will be DQ'd.

Sound is, without a doubt, the #1 issue that we face in keeping trails open.

Tom B
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Old 01-25-2010, 03:32 PM   #71
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Quote:
Originally Posted by barnyard
Sound is, without a doubt, the #1 issue that we face in keeping trails open.

Tom B
From all the statisics I've seen for both MN and WI it appears to be more related to riding/driving off the marked trails than noise emitted on those trail systems espcially by those operating ATVs.

WI LEO's typically set up sound checks on busy weekends near trailhead parking lots.. ie Black River Falls, Danbury

I've also found that the cheap sound meters really are ineffective and from those sound checks I've experienced. Those LEOs testing really didn't care what I may have tested with previously, if it didn't pass their test.. there would be a fine.
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Old 01-27-2010, 11:38 AM   #72
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Finally took care of the 2x4 rock hard seat and had a local guy upgrade it w/ some memory foam and a wider seating area:









The OEM seat was about 4" wide right where I sat, now w/ the makeover that same spot is almost 8" wide.

More cush for the tush:

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Old 01-27-2010, 11:39 AM   #73
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While I was at it I added some Tugger Strapz front and rear:













While I was at it I also rear re-did the license plate mount/turn signal/mud flap thingy:




This works much better. The turn signal are more visible and it keeps the mud off the back.


I did not like my original install of the PC-V and Autotune modules on the bikes side plate. The units did not stick to the panel well and were a pain to work w/ when the panel was opened. They had a tendency to dangle off the side of the bike by their wires.


Solution: cut a triangle out of Kydex that fits inside the bikes frame, zip tie it to the frame then zip tie the 2 modules and all the wiring to the panes.


Result: super strong mounting point that keeps the modules securely mounted and easily accessible.





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Old 02-10-2010, 12:31 AM   #74
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How much did the seat cost? it looks comfy
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Old 02-10-2010, 06:52 AM   #75
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$175
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