Got Told To Get My Ute Sound Tested(clevo Xw)  

Trickassmarks

Whent down to c.e.s got my test done........106db lol, sounds sick though
he tested it at a 45 deg angle at 30 odd cm away, at 3k. Getting some bigger mufflers installed at a cirtificate wriiten up.

2 new mufflers, flange plates put in $500.
Word of advice done ever use performance pipes acacia ridge. C.e.s pointed out some less than desirable work, that coupled with my own experience, i wont step foot in there again if i have to.

wat'r

Sigh...

Testing standards are everywhere online. They clearly give the setup.

It is 200mm off the ground, 500 mm away at 45 degrees.... not 30cm ish.

It makes a difference. You would definately still be over.... but it may only a tad over 100dB. 5 or 6dB is a good head start

aussiemk2

good to see you found the correct figures wat'r.

I Fry 2

If you have an iphone or android phone just download the sound meter app, its free and relatively accurate (within 1-3db).

HP Plod

Ok,

We have a sound level meter where i work, it is a fairly complicated system really, (we haven;t used it in a while as the calibration is fairly expensive and well it takes a shit load of time to do one car properly, soi i'll spitball the measurements here as i can't remember exactly) we have to ensure that the exhaust is less than 300mm above the road and at the rear of the vehicle i.e. cut off pipes in utes can't be tested.

We have a tool to measure the angle the microphone is away from the vehicle, 45 degress at 500mm. We then use a calibrating noise tester, which emits a 90Db sound and this is placed over the microphone, if it reads 90Db, then it is acurate. We then check ambient decibel readings, if its more than 85Db we don't do it, so within 5 of the legal range. Now rev range depends on the engine, make, model and year etc. So we have a booklet that has all the engines available up to and including 2005 vehicles (not the newer ones as they have not set a rev range yet so its difficult), for arguments sake a 351 cleveland in an Xw will show that we need a rev range of 4300RPM (again just an example), we then put an electronic tachometer on your leads, and check that the re range is done, we then start your car and have you stand near us and show you we are getting to said rev range and take a reading of the db at that range, we then lag off, and do it again, and then take the average (sum of both readings divided by 2). You have three options then, no action legal or lower, up to 10Db, $100 fine, over 10Db $200, and both get defect notices.

Pre 1983 vehicles get 95 Db as their legal range.

Bikes etc have something like 100-105 Db allowable, sounds stupid i know but "Shrug".

Exhaust shops used to test alot of cars but the gear we use is expensive and it overrides any tests done by an exhaust shop as they don't calibrate their gear ( that i'm aware of). I will listen to a car and if i think its loud i'll pit it, but i don't carry the SLM gear anymore, too bulky and to bothersome.

Hope this helps