Big Buck sound test

[gncc571]

Just wondering what everyones readings were?
I'd been 102 the last couple races but this one I was 98(I know thats hard to believe) :D

[spincr4hire]

97 at NC, 104 at SC:rolleyes:

[CatMostFeared]

107 this race and they said to just fix it by the next
104 in Fl.:confused:
Sound check is not very good its different for everyone
everytime.(Stupid tree loves):mad:

[rs169300]

92 at Georgia and NC, 90 at SC

[spincr4hire]

someone please explain to me why the db level matters anyway, 104 vs. 108, whats the f'in difference, they are both pretty f'in loud....:confused: :confused:

[cheetah]

I've been 103 at the last two with a quiet core. 102 before without QC.:rolleyes:

[shaff107]

98 in NC with a duncan fatboy 4 on a 450R in NC and and then it changes to 103 in SC. How do u jump that much in that little of time. This is CRAZY.

[EX4me]

Sounds like someone is not using the same testing techniques or different equipment at each race.:confused:

[CatMostFeared]

I dont think they know what there doing.
It looks like they bought something ebay to use.
I'm going to make me a slipon silencer to side inside my pipe
just for testing:devil:

[popo]

Differnent pipe this time.

I was 112... Told the bonehead to take his jacket off the small post directely just to the left of the sound test machine. Tested a 101 after that.

[James Parent]

is it true that 99db is ten times louder than 98db? I belive i heard that somewhere

[Scott Kawi700]

[QUOTE]Originally posted by James Parent
is it true that 99db is ten times louder than 98db? I belive i heard that somewhere [/QUOTE/]

No that's not true. dBs work on a logarithmic scale, this basicaly means that for every 10 dB increase the sound level doubles. In other words 95 dB is twice as loud as 85 dB and 105 is twice as loud as 95 dB and four times as loud as 85 dB. Hope that helps.

Check out this article it has good info.
http://www.dirtrider.com/features/141_0309_sound/

[JOEX]

Originally posted by Scott Kawi700
[QUOTE]Originally posted by James Parent
is it true that 99db is ten times louder than 98db? I belive i heard that somewhere [/QUOTE/]

No that's not true. dBs work on a logarithmic scale, this basicaly means that for every 10 dB increase the sound level doubles. In other words 95 dB is twice as loud as 85 dB and 105 is twice as loud as 95 dB and four times as loud as 85 dB. Hope that helps.

Check out this article it has good info.
http://www.dirtrider.com/features/141_0309_sound/
Thanks for the link, looks like there might be some good info there.:)

[gncc571]

Thats weird that alot of peoples level went up,my went down and I didn't change anything:confused:
I don't think they know what their doing either:eek2:

[wyndzer]

I was 100 in NC and 104 in SC.

[Dan229]

I noticed the guy holding the meter would move it around quite a bit. One time he held it close to straight behind the pipe and then the next time he was a foot to the right. With only that piece of string to guide him he can move that thing around too much. I am thinking that a fixed angle gig with a fixed tag that butts against the pipe and the exhaust outlet (think of a ruler with one of those sliding pieces that makes a 90 off the ruler and sticks out about an inch) for the meter to be held in would produce more consistent and accurate readings.

[TRX500]

3 V forces in a row all with HMF's 1st was 103, mine was 100, last one was 101.

I was watching the meter closly this weekend. as the guy reved my quad up I watch the meter go slowly from 97 98 99 100 101 then it stopped at 101 for second and jump directly to 106.1 they told me I was at 104 and i passed. I just laughed and went on

[cdalejef]

99 in NC and 106 in SC :confused:

[Pappy]

has anyone been told they couldnt race due to the DB level yet:confused:

[Admin]

I blew a 91db at the check point and they let me go on my own Recognizance.

[ranger400ex]

104 this race

[Wingnut]

96, 93, and now it's 89.

[Pappy]

Originally posted by EXriders Admin
I blew a 91db at the check point and they let me go on my own Recognizance.

shooting your mouth off again:devil:

[mudboggin]

I got 107 on my Grizzly with an HMF pipe. They told me to have it fixed by the next race or I could not run. I do not know if they will inforce that or not. Guess I will find out.

[James Parent]

No that's not true. dBs work on a logarithmic scale, this basicaly means that for every 10 dB increase the sound level doubles. In other words 95 dB is twice as loud as 85 dB and 105 is twice as loud as 95 dB and four times as loud as 85 dB. Hope that helps.

knew it was something like that :/ just got done doing logarithms in school..

[crayfz]

107,told to get it fixed, before TN, are you won't be aloud to race.

[79400ex]

To every one that was getting a high reading, was it over cast, cool or cold air temp. or low humidity? Because all these things will effect sound. Also, was it done bare ground or on grasses area. the above will effect the results.

[Pappy]

someone who knows how and has the equipment should set up at a race and see what the #'s are

[JOEX]

This is how it's supposed to be done....
http://www.oohva.org/pages/What%20Works%20for%20Sound.html#Anchor-47857


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.

Turning people away from a race is gonna hurt RP pretty bad I think. Now if they recorded your name, racing number and DB reading at every race and the readings were the same then I can see them telling you NO racing until you get it fixed. But i've yet to see anyone report that every race their DB reading was the same. Until RP figures out what they are doing and get these test readings down to an art they have no rights to say anything.

I know of one person that went thru the tech inspection 2 times on the same quad and his readings were like 8 DB off between the 2 test all within an hour of each other..:huh :huh Same quad, same rider, same day only an hour difference between tests..:eek2:

I'm not against the testing but if i drive 8 hours to a race and i'm told my exhaust is too loud and that I can't race. Things are gonna get real ugly..:mad:

[spincr4hire]

Originally posted by Rico
I'm not against the testing but if i drive 8 hours to a race and i'm told my exhaust is too loud and that I can't race. Things are gonna get real ugly..:mad:

yep, somebody's getting kikked up!:mad:

I wonder if they'd refund your $40 if thats the case?

[Wingnut]

Originally posted by Rico
I'm not against the testing but if i drive 8 hours to a race and i'm told my exhaust is too loud and that I can't race. Things are gonna get real ugly..:mad:

Or, you could just keep getting back in line until you pass.:rolleyes: :blah:

Originally posted by Wingnut
Or, you could just keep getting back in line until you pass.:rolleyes: :blah:

ROFLMFAO



:D :devil: :D

[spincr4hire]

Originally posted by Wingnut
Or, you could just keep getting back in line until you pass.:rolleyes: :blah:

great idea!;)

I wonder if they'd refund your $40 if thats the case?


I know if you go to the starting line but never start the race they give you your money back.

[SGA]

Source Intensity Level


Threshold of Hearing (TOH) 0 dB
Rustling Leaves 10 dB
Whisper 20 dB
Normal Conversation 60 dB
Busy Street Traffic 70 db
Vacuum Cleaner 80 dB
Large Orchestra 98 dB
Walkman at Maximum Level 100 dB
Front Rows of Rock Concert 110 dB
Threshold of Pain 130 dB
Military Jet Takeoff 140 dB
Instant Perforation of Eardrum 160 dB

[gncc571]

what day did everyone go thru tech,I went on Friday evening just thought that might make a difference on why some went up and others went down

[popo]

Originally posted by gncc571
what day did everyone go thru tech,I went on Friday evening just thought that might make a difference on why some went up and others went down

I guess you have a good point, I went thru Sat morning.

I understand it was pretty windy Fri?

[mudboggin]

I went thru Friday afternoon.

[CatMostFeared]

Originally posted by mudboggin
I went thru Friday afternoon.

Friday windy

[mudboggin]

Originally posted by CatMostFeared
Friday windy

Yes it was windy Friday. That might be why the numbers where higher than saturday.

[lshonda310]

NC I was 99 and they had very low rpm's, SC I was 107 and I thought he was going to hit the rev limiter!! he said that at Loretta's that it would be a pass or fail, but didn't say what they would do if you failed. I have a YFZ with HMF exhaust, which is what most of pro row is running, what are they going to do disqualify all of pro row?

[cdalejef]

Nice ride saturday Scotty!

[lshonda310]

thanks, I like my YFZ alot, just wish they had contingency like Honda, makes me think real hard about getting one.

[cdalejef]

Originally posted by lshonda310
thanks, I like my YFZ alot, just wish they had contingency like Honda, makes me think real hard about getting one. Ya, no joke. The only bad thing is you still really need to spend about $3000 to get it up to speed. :( So is it worth the contingency money or not?

[lshonda310]

Originally posted by Jeff@QuadShop
Ya, no joke. The only bad thing is you still really need to spend about $3000 to get it up to speed. :( So is it worth the contingency money or not?

I would probably just run it stock with a twist throttle:D

[cdalejef]

Originally posted by lshonda310
I would probably just run it stock with a twist throttle:D Now I see where your going with this. ;)

[crayfz]

Was Jeff@QuadShop the only pro that blew a high number?

Was Jeff@QuadShop the only pro that blew a high number

are you talking about the exhaust decible reading or in the field sobriaty test. cus some rider might have had high numbers on that after the race!

[crayfz]

Your right, I would hope not pro row, but you never no.

[CatMostFeared]

Ok I have made me a test pipe insert just for sound test.
I'll post and pic tomorrow.2 screws and its in and out.Sounds like a stock pipe.

[popo]

Originally posted by CatMostFeared
Ok I have made me a test pipe insert just for sound test.
I'll post and pic tomorrow.2 screws and its in and out.Sounds like a stock pipe.

What ya use, one of Rico's bong's

Originally posted by popo
What ya use, one of Rico's bong's



:eek: :eek:

[seatec]

I think this year GNCC is doing a dry run and try to find all the snags in testing DB in the field. They will Compile the data and go for real next year. Somebody earlier was talking about a template and i agree. they should have a template that you can hold against the muffler so all readings are identical. they should also make a perimeter where the quad sits in and no other object is allowed to prevent echo or other re verb.
They should also have a fixed DB sound output device at every race where they can calibrate the measurement with to allow for varying weather conditions.

[SGA]

I agree. If GNCC is going to check for sound levels, they need a base set of guidelines to follow.

[CatMostFeared]

Here is the top secert sound pass omatic.
Sounds stock 2" long and theres a 3/4 hole and the Quad still runs good but with a loss in power.:muscle:

[CatMostFeared]

Originally posted by popo
What ya use, one of Rico's bong's

Sorry I cut your pipe up Rico:bandit:

[popo]

Originally posted by CatMostFeared
Here is the top secert sound pass omatic.
Sounds stock 2" long and theres a 3/4 hole and the Quad still runs good but with a loss in power.:muscle:

That looks like a spud launcher

[FASTeR]

I think my thunder alley will be quiet enough, marty that looks very clean, but maybe version two could possibly go behind the end cap?? and sit in the pipe, they will eventually catch on to it being in and it being out, could pose a problem. I was thinking of something perhaps utiliting a portion of a stock pipe spark arrestor... or perhaps a tec unit like yoshimura has. My cousins sparks that had to have the end cap cut back, after the gncc official plowed it 3 times with his kodiak at the ironman. Now its really loud.. perhaps your hushomatic2500 will work on it, or something similar.

[GNCC225]

in n.c. they said it was to loud and just get it fixed in the next couple of races. So of course i didn't do anything to it and at s.c. they said it was fine. So i guess i'll see what they say in tenn. i can't wait.

[quadracer12]

97 in NC 106 in SC:rolleyes:

[quadracer12]

Originally posted by lshonda310
I have a YFZ with HMF exhaust, which is what most of pro row is running, what are they going to do disqualify all of pro row?

when i was in line at SC i saw smiley walk up with his handle bar tag in his hand and the guy stamped it.

[Towlieee]

Originally posted by Scott Kawi700
[QUOTE]Originally posted by James Parent
is it true that 99db is ten times louder than 98db? I belive i heard that somewhere [/QUOTE/]

No that's not true. dBs work on a logarithmic scale, this basicaly means that for every 10 dB increase the sound level doubles. In other words 95 dB is twice as loud as 85 dB and 105 is twice as loud as 95 dB and four times as loud as 85 dB. Hope that helps.

Check out this article it has good info.
http://www.dirtrider.com/features/141_0309_sound/


pretty much right..

Except its not an exact number like 10 more db isn't exactly twice as loud.. 10db is generally aroudn twice as loud however..

3db is twice the pressure.. so going from 100-103 your bike is now producing twice the SPL..

so 100-103 is a big difference..

if anyones into car audio, they'd know that the difference of hitting 150db's, and 153 is usually a matter of doubling power/speakers

[spincr4hire]

I ordered the quiet core for my HMF yesterday, hopefully I'll pass at Sparta.

[Doibugu2]

Are they changing test in Sparta? I think I might come down to race, but I don't want to come down if I might not pass?

By the way I have an HMF Slipon, no quiet core.

[spincr4hire]

If you are over 104db, you won't race. I have a HMF slip-on, I was 97 at NC, and 104 at SC, so I didn't want to risk being over 104 at Sparta so I ordered the quiet core. I talked with the guys at HMF, to do a db reading properly, it must be done in a sound proof area, with no quads going by throwing the readings off...but that aint gonna happen.:rolleyes:

[Doibugu2]

It seems like everyone is trying to complie with RP, but they have a system that doesn't work.

It makes sense to me that they want to keep sound down, but with 400+ quads if you have some stock and some not, those few that are above 104 is it really going to make a difference?

Guess I better call and get me a QC too.

[James Parent]

Anyone have a FMF powerbomb with Yoshi mura slip on? and does removing your airbox lid make it louder?
whats your DB reading

[parkers30]

the reason the reading vary so wildly is because EVERYTHING can throw it off, wind, someone talking can add a db or two, quads in the back ground will kill you, and the distance it is taken at, there are going to be hard pressed to enforce it exactly, 104 with other things in the background is all that loud

[James Parent]

whats gonna happen is the quad is going to have to park in a circular area in the middle of no where, and a peice of wood with the DB meter screwed into it ( to maintain consistent distance) will be held agaist the muffler, and people will have a 2 hour no riding time.. or however long it takes to do soundcheck

the reading should also be displayed so there is no controvery on if they should have passed or not

i have never been to a gncc race, but from all this controversy i'd say they don't have it fine tuned enough to be too strict about the readings
james

[parkers30]

exactly, they are going to have to make alot of special arrangement to do it properly

[CatMostFeared]

They didnt do a sound check in TN but they told me they would for Sparta