| Author | Message | ||
     Stoobr2 |
Can anyone give provide me with a "peak" decibel reading for a XB9 with the full factory race kit ? I've been offered a Trackday here in the UK,but the organisers have put a 105Db limit on Exhausts,I know my Frightning is more than that? just wanted to know a proper figure. Thanks in advance........... | ||
| Dynarider |
With the factory race kit you wont be anywhere near 105db. | ||
| Johncr250 |
105 Db is pretty loud. The D&D slipon on my friends ZX7 is 107 Db (very loud to me) and when revs it up, seems like i can hear him miles away. If i had to guess the race kit would be round 90. | ||
| Buckinfubba |
stoo you should be ok | ||
| Stoobr2 |
But the sticker on the side of the frame (Xb9s) near the headstock says 97Db @ 3,700rpm and a bike with a standard can sounds like a sewing machine  surely the "race" can has got to be worth more than 8Db ? | ||
| Freyke |
Stoobr2, ALL... dBa(aurel) and dB in general is not linear.... 3dB is a HUGE increase in power (2 fold increase in power/loudness to be exact)...Make it a 6 dB increase and that is 4 fold the power/loudness and so on with every 3 dB of increase.... So to get back on topic if the standard can is 97 dBa I cant imagine the race kit being over 100 dBa (twice as loud).... | ||
| Kcfirebolt |
Wow. I learn the strangest stuff reading this board. So decible measurements are like earthquake measurements. They are not incremental increases; they are significant increases in magnitude. Do I understand this correctly? (not sure what I wrote made sense to anyone but me) | ||
| Skully |
A decibel is a logarithmic function. An increase of 3db doubles the quantity that you are measuring. And you thought your days of math were over!  Keith | ||
| S320002 |
No one mentioned where the decibel meter is placed in relation to the bike. It makes a big difference. | ||
| Dasxb9s |
From my experience... my guess would be an XB with a race kit... at least 100 Db... but not more than 105Db you are concerned about. Look through the net... and review Db charts of common noise producing item.. 100 Db for chain saws, snow mobiles and air drills. City traffic inside a car 85Db, ambulance siren 120Db, garbage truck 103 Db The legally permissible noise exposure varies from country to country. U.S. law currently allows exposure to 90 dB for eight hours. Most countries allow only 85 dB for an eight hour work day. Scientifically noise doubles with every increase of three dB, but U.S. legislation has defined a five dB doubling for legal purposes. This definition allows more noise exposure and consequently require less efforts from corporations in regards to noise abatement and hearing conservation efforts. (don't cha just love politicians) I learned much of this too late... I flunked my hearing test in my left ear for the past 3 years. Had I been a civilian contractor... I would have been laid off for flunking my physical... however... upon retirement I will be making a workman's comp claim for a tax free settlement. I wear ear plugs when I ride my race kitted XB9S... to try and not further the damage. The constant ringing in my ears for the past 30 years never fades... I have not experienced silence since I was a child... PROTECT YOUR HEARING... this type of noise... causes nerve damage... which at last check... hearing aids will not correct... losses in the high freq range. | ||
| Stoobr2 |
Thanks chaps you've been most helpfull,thanks for the Db lesson also Freyke it's much appreciate and understood (I think) Guess I'll just have to suck it & see with the trackday organisers,can't see it being a problem now you've explained it so well. Thanks for all the help/input it's much appreciated. Stoo. |
