This is the current information for exhaust testing procedures. (Note: some bits may only apply to SA). Notes have been taken from various Government websites.

Exhaust dB levels in SA:
(a)for a car‑type vehicle built after Jan 1983 - 90 dB; or

(b)for a car‑type vehicle built before Dec 1982 - 96 dB; or

(c)for a motor bike or trike built after February 1985?94 dB; or

(d)for a motor bike or trike built before February 1985?100 dB.

Exhaust Outlets
For vehicles manufactured prior to July 1988 the requirements are not specific, however, vehicles submitted to Transport SA will be acceptable if:-

a. The exhaust outlet exits beyond the last door or window opening on the side or rear of the vehicle;

b. The exhaust outlet is as close as possible to the outer edge of the vehicle but not outside or underneath the vehicle;

c. The exhaust system, if contactable, is adequately shielded and any sharp or hazardous projections are suitably treated.


Exhaust Noise Testing
Many statutory bodies around the world currently mandate that vehicles comply with stationary exhaust noise tests specifications - Generally based upon the USA's "SAE J1169 Measurement of Light Vehicle Exhaust Sound Level under Stationary Conditions"

In Australia the test requirements are ADR 28/01 stationary noise test and based upon SAE J1169. In fact, the above tests have identical test procedures and only the required limit varies:

SAE J1169, USA 95 dB
ADR 28/01, Australia 90 dB

The test involves positioning a type 1, SIA compliant ANSI S1.4 - 1983 noise level meter, specifically as illustrated in the diagram below. No other positioning is relevant! Noise tests are extremely specific in their scope and must be conducted very carefully!


Diagram from SAEJ1169 Testing Procedures

Engine RPM must be held steady at 75% of rated peak horsepower RPM.

Again, it must be emphasised, all facets of a noise test must be specifically followed for the test to have any meaning.

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[NATHAN] -- Sold everything mini related and am back in big beautiful BMWs

My van was tested just a couple of weeks ago, three runs 96,97,96 passed its legal.
i know the ricer cannon is a bit much but it was already like it when i got it so not my fault.

i tested mine thother day when it was on the dyno and 109.9db i thought i was a bit loud, so we tested at the front of the car when the engine was on full song and only got 115db and inside the car 104.8db.so im glad that ou have pointed out that my car is too loud, but how do you know waht 75%of peak torque is is that peak torque of an 850 or full on race motor producing 100ftlbs of torque at 5250 rpm.
or does it make no difference?

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www.minicranks.com add me to your watch list and come back again soon, under construction.

just looking at the pictures where do you put the meter if the exhaust come out the middle, still 45deg to the side or 45deg to the side of the exhaust?
Im doing a loudest exhaust comp in the morning and this will come in really handy.

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www.minicranks.com add me to your watch list and come back again soon, under construction.

Jai I believe the key point is, it is at 0.5M distance and 45* off axis to exhaust- so 45* either side of the centre pipe would be OK.

<edit> all those pics show the exhaust coming straight out the back...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

i figured that out but the biggest other one was twin exhausts i suppose they dont get a choice i just pick one and stick to it.
Ill elt you know what the db reading was on the cars and what mods were done as there are a few with full home made stainless exhaust systems onboard and they is LOUD i mean really loud.

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www.minicranks.com add me to your watch list and come back again soon, under construction.