How loud is 105db?

18 messages
09/01/2006 at 10:23
I'm looking at an Oulton trackday in Feb, and it's a 105dB limit. My R1 has a full gibson system, and it's not the loudest thing out there, but is 105 hard to meet with a racepipe?
09/01/2006 at 10:56
A tough question to answer as we all hear things differently.

Some exhaust manufacturers measure sound and put their findings on the web - check out www.akrapovic-exhaust.com/ for some base line figures.

The db scale is not linear and roughly, a 10dB increase will SOUND about twice as loud to a human ear. So, if the Akra is 100dB, the 105dB will sound about 50% louder than the akra - i.e. quite loud.

Orange Z1000 with a few mods....
09/01/2006 at 11:07
i think most race cans are under 105dB limit

see link below

cgi.ebay.co.uk/RACE-CAN-DB-KILLER_W0QQitemZ7979024625QQcategoryZ25623QQtcZphotoQQcmdZViewItem


you could carry one of these in your toolbox just in case

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09/01/2006 at 12:12
liam wrote
I'm looking at an Oulton trackday in Feb, and it's a 105dB limit. My R1 has a full gibson system, and it's not the loudest thing out there, but is 105 hard to meet with a racepipe?


When we did a track day there, we weren't aware of the limit until the briefing, but to be honest everyone got through, they kept a few people in the collecting area until they had warmed up their bikes properly & were therefore quieter, it wasn't a problem.
09/01/2006 at 12:20
will one of them stubby casn be under 105db? Mine sounds a bit noisey compared to the akrapovic one i have.




www.littlewoodracing.co.uk

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09/01/2006 at 13:16
Next time you go to the track take the Akra and if you get pulled up for noise you can just swap them.

Plnk
09/01/2006 at 15:45
bigmart wrote
i think most race cans are under 105dB limit

see link below

cgi.ebay.co.uk/RACE-CAN-DB-KILLER_W0QQitemZ7979024625QQcategoryZ25623QQtcZphotoQQcmdZViewItem


you could carry one of these in your toolbox just in case



i tryed one of those and it made my bike run like shit, in the end i had one of the scorpion inserts from the guy that is usualy at donny quiet days and twas pukka, and only £20 fitted. hope this helps.

Chunk sport racing #83
09/01/2006 at 16:16
Anyone know who this mysterious guy is with the Scorpion baffles??

Does he provide these through a website per chance???

Orange Z1000 with a few mods....
09/01/2006 at 16:46
ZedKid wrote
Anyone know who this mysterious guy is with the Scorpion baffles??

Does he provide these through a website per chance???


There are plenty of baffles / DB killers on Ebay, about £12.00 by the look of it. You may have to drill a small hole at the very end of your exhaust as there will be a small screw to hold it in place (same as the guy from donny would do) then it just pops in the end if needed.
09/01/2006 at 16:58
Chebs! wrote
There are plenty of baffles / DB killers on Ebay, about £12.00 by the look of it. You may have to drill a small hole at the very end of your exhaust as there will be a small screw to hold it in place (same as the guy from donny would do) then it just pops in the end if needed.


Yeah, got those in my Scorpion pipes now - just interested to see if I could get hold of legit baffles instead..

Orange Z1000 with a few mods....
09/01/2006 at 18:19
Waaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhh

I have enough bikes thanks
09/01/2006 at 18:39
Couch Commando wrote
Waaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhh

Take a bigger breath CC. That only registered at 104DB

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09/01/2006 at 20:40
bigmart wrote
i think most race cans are under 105dB limit

see link below

cgi.ebay.co.uk/RACE-CAN-DB-KILLER_W0QQitemZ7979024625QQcategoryZ25623QQtcZphotoQQcmdZViewItem


you could carry one of these in your toolbox just in case


I was going to lash something up like that (I have something similar in the DRZ400 exhaust) but at that price it aint worth the bleeding knuckles.

Cheers everyone.
10/01/2006 at 16:30
Is that Liam who races at Aintree who broke his collarbone last year?

If so I used to work with yer missus

You should be ok at Oulton, there is a technique on the noise testing

Lil
10/01/2006 at 17:27
Lily wrote
Is that Liam who races at Aintree who broke his collarbone last year?

If so I used to work with yer missus

You should be ok at Oulton, there is a technique on the noise testing


That's me! What's the technique? Tell all or PM me!
10/01/2006 at 19:03
liam wrote
I'm looking at an Oulton trackday in Feb, and it's a 105dB limit. My R1 has a full gibson system, and it's not the loudest thing out there, but is 105 hard to meet with a racepipe?


This was the limit at BSB meets until recently so I can't see you will have a problem at a track day

"I criticise by creation - not by finding fault."
11/01/2006 at 01:11
irie wrote
(iirc) a 3dB increase will sound twice as loud. A 10 dB increase will sound about 2 x 2 x 2 = 8 times as loud.


Correct.

Oaf by name,Oaf by nature
11/01/2006 at 20:08
the best way I ever had DB explained to me was a bit like this:

the difference between 103db and 104db is like having 3 pints and feeling a bit tipsy and having a fourth and being absolutely shitfaced.

I have Akra headers on mine and a modded Ti Devil Superbike spec can on mine which is fucking loud at full chat - according to Devil it is 106db (which is odd as SB limits are 105DB)

Vast majority of cans will get through 105db noise test
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