quick question - legal exhaust db

[MrThanh]

ive heard they can also do a rolling test.

how do they keep the distance between the exhaust and the measuring device consistent then?

[noodleman]

they hold it and run after the car LOL

[Jingers]

how do they keep the distance between the exhaust and the measuring device consistent then?

dont know have a jig just like ur camera?

[tinkerbell]

it is a "drive by" test and the dB for drive by is 70ish, not 90ish,

the staionary 90 is measured on a 45' angle abt 1m from the exhaust

the drive by 70 is measured with the Mic on a tripod aimed generally at the road...

[matt]

so basically if you have a loud exhuast they will find a way to get ya

[hebe]

I think I might be able to pass the 90dB test if it's 1m away

[sangers]

in the case of some cars, the intake might be more of a concern than the exhaust at around the vtec point, don't u think?

[noodleman]

yeah...specially if you have ecu's like i use to have with vtec kicking in earlier then stock....

[Noel]

Jasma approved is road legal. Japan's dB output rating is on the same level as most developed nations. While AU gets it's preferential control guidelines off a standard EPA charter used worldwide based on environmental laws/considerations and then makes modifications relevant to the local country/continent.

[tinkerbell]

Noel - your post makes no sense?

[rayDC2R]

Sorry to bring up an old thread, but just wondering what JASMA exactly is and does it hold ground in Australia in terms of police?

[air23box]

Jasma have nth to do with Aus road laws......its just a local thing for Japan...The Full name should be <<The Japan Automotive Muffler Association>>...its a government body of the Japan government to apply regulation on how the muffler should be done and if its approved then they will put the JASMA plate on it....their web page is www.jasma.org ....

[Chosta]

Are they allowed to open your bonnet and take a dB from the engine?

[e240]

Just wear Ear plugs...Hey Presto...below the legal db limit...

[sinobi]

mine should be 100+ around 8000rpm (on the track days that is )
apexi cone = getting done = getting epa = money = my gf kicking my ass heheheh