I asked some local track courses like button willow about the sound limit. they said its 101 db limit.

would a side out exhaust be 101 db ? just curious

 

It depends on too many variables most importantly exhaust construction (and where you got it pointed) but that sound limit is a little below the standard db limit for SCCA club racing. Whether you blow the db limit also depends on the temp, humidity and other factors too. One day you may be fine. The next day you are being black flagged. Out comes the steel wool shoved up the exhaust.
Barry H.

 

"pretty loud"


at what distance? at what rpm?


find out where they test it from, and just let off through that section....

 

Its loud, about this loud.

 

pretty f'ing loud...

if a pneumatic drill (95ish) is less than 101 and each point raise is what? 10 times louder than the previous? i'd say 101 is ridiculous.

here is another... as loud as a nyc subway? are they really that loud?

 

I think 103db is the ALMS limit, and that includes 4 rotor Mazdas and 7.0L V-8s, so 101 is pretty loud.

 

On my integra, I have a strait pipe going back to the stock location. At Sears Point I am 98dB.

 

i got 104db at PIR portlands international raceway and i swear it doesnt seem as loud but i don't know maybe its because i am in the car. And i am using the Tanabe Racing Medaling full race exhaust

 

i dont want to know how loud my race kar is...its deafening tho

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paRRRker &raquo;</TD></TR><TR><TD CLASS="quote">its deafening tho </TD></TR></TABLE>

Yes.

 

10 dB has 10 times the intensity, but quantifying 'loudness' from dB is difficult. different frequencies will sound louder than others, hence harley's not sounding too offensive

but hondas are in the nasty frequency range, so 101dB sounds pretty effin loud

 

but that 10x db is measured from what rpm range. I assume its from ideal? since stock cars at WOT already closing to 100....

 

I ran a straight 2.5" from a 4-2-1 header in my Civic (D16Z6) to the stock location. I got readings of 105db & 106db at Grattan. I installed a turn on the end and the reading went down to 101db/102db (same day). Weather also has a lot to do with sound readings. Rain or damp conditions = louder readings. The muffler I'm installing this winter should get me down under 99db in any conditions.

Matt

(edit for the early morning posting )

 

Check this out

http://www.wdcr-scca.org/offic...s.htm