Hey guys, a mate of mine is expecting a letter from the EPA after taking his 355 powered LX through a roadworthy station recently. I have a basic dB sound level meter at home, so we want to use it to get some ball-park readings for him. I've forgotten what the testing RPM is though...
Does anyone know for sure what the testing RPM is for:
4 cyl
6cyl
V8
And we're talking old cars here (1970's), not the late model stuff.....
Cheers.
What is the testing RPM for EPA noise levels?
Started by
LXCHEV
, Aug 05 2009 09:59 AM
11 replies to this topic
#1
LXCHEV
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Posted 05 August 2009 - 09:59 AM
#2
LXCHEV
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Posted 05 August 2009 - 10:53 AM
FYI : Mate just called me back, he rang a Midas store, and they've said for a 308 it's 3600RPM and 96dB.
#3
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Posted 05 August 2009 - 12:31 PM
96db is the correct sound limit for a pre 1982 V8, however the rpm should be 3300rpm not 3600rpm.
4 cylinders - 4000rpm
6 cylinders - 3200rpm
Cheers.
4 cylinders - 4000rpm
6 cylinders - 3200rpm
Cheers.
Edited by Redslur, 05 August 2009 - 12:35 PM.
#4
_Herne_
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Posted 05 August 2009 - 02:00 PM
96db is the correct sound limit for a pre 1982 V8, however the rpm should be 3300rpm not 3600rpm.
4 cylinders - 4000rpm
6 cylinders - 3200rpm
Cheers.
For what its worth the testers here asked me for 3500 rpm...They are never happy with my dB level because its always high and yet good friends tell me mine is quiet lol
Herne
#5
_mumstaxi_
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Posted 05 August 2009 - 02:29 PM
In QLD (From memory) it depends on the "individual" engine spec's, not just number of Cylinders, this is because it is based/tested at the number of rev's of 3 quarters of the maximum HP rpm, (max hp figure as stated by the manufacturer of the engine, not "your" dyno read out,LOL) so one V8's test rpm, will differ from another V8s that may have a higher/different HP curve.
But you should check exactly on how the test is legally supposed to be done, so your mate gets a fair go (incase its a close call, 1 or 2 db)........only reason i say is ,not that its that many (about 5).......... but honestly ,none of the db level tests ive heard getting conducted (in QLD), ever seem to be done (especially the road side tests) following the correct procedure,
The QLD test is quite envolved,(i think QLD copied the test procedure from NSW, so VIC may be same) and (don't have paper in front of me) but requires things like calibration of the sound level meter, ambient noise test before and after , then take a average from 4 tests/readings all at a set (exact) distance/angle, all within set parameters (nothing within a 3M square) plus all the other stuff i can't remember !
Think also the test is done with db meter set to C-weighting/slow (different weighting can effect reading)
May pay to know incase tester is a bit incompetent ,Bottom line is, if your cars loud enough to get pulled over for noise, it will most likley fail the "correct" test procedure anyway ?
MT
But you should check exactly on how the test is legally supposed to be done, so your mate gets a fair go (incase its a close call, 1 or 2 db)........only reason i say is ,not that its that many (about 5).......... but honestly ,none of the db level tests ive heard getting conducted (in QLD), ever seem to be done (especially the road side tests) following the correct procedure,
The QLD test is quite envolved,(i think QLD copied the test procedure from NSW, so VIC may be same) and (don't have paper in front of me) but requires things like calibration of the sound level meter, ambient noise test before and after , then take a average from 4 tests/readings all at a set (exact) distance/angle, all within set parameters (nothing within a 3M square) plus all the other stuff i can't remember !
Think also the test is done with db meter set to C-weighting/slow (different weighting can effect reading)
May pay to know incase tester is a bit incompetent ,Bottom line is, if your cars loud enough to get pulled over for noise, it will most likley fail the "correct" test procedure anyway ?
MT
#6
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Posted 05 August 2009 - 03:44 PM
Noise tests should be conducted as per the National Transport Commission requirements I have attached. It is a national document.
http://www.ntc.gov.a...DocumentId=1392
4.2.3.3 Where the ESMP for that engine has not been determined by the testing
authority then the engine shall be brought to and stabilised at a speed as close
as the testing officer can achieve to one of the following speeds:
In the case of a passenger car or derivative, if the engine has:
(i) 5 cylinders or less 4000 rpm
(ii) 6 cylinders and is
manufactured before 1995 3200 rpm
manufactured in 1995 or later 3600 rpm
(iii) 8 cylinders and is
manufactured before 2000 3300 rpm
manufactured in 2000 or later 3900 rpm
(iv) more than 8 cylinders 4300 rpm
(v) If the engine is a rotary engine 4500 rpm
In the case of a motor cycle:
(i) for a two-stroke engine 3750 rpm
(ii) for a four-stroke engine:
from Harley Davidson 2500 rpm
from any other manufacturer 3000 rpm
In the case of a goods vehicle or bus, if the engine has:
(i) 6 cylinders or more 3000rpm
(ii) 4 cylinders and is
manufactured before 1970 2500rpm
manufactured in 1970 or later 3500rpm
Hope this clarifies things.
http://www.ntc.gov.a...DocumentId=1392
4.2.3.3 Where the ESMP for that engine has not been determined by the testing
authority then the engine shall be brought to and stabilised at a speed as close
as the testing officer can achieve to one of the following speeds:
In the case of a passenger car or derivative, if the engine has:
(i) 5 cylinders or less 4000 rpm
(ii) 6 cylinders and is
manufactured before 1995 3200 rpm
manufactured in 1995 or later 3600 rpm
(iii) 8 cylinders and is
manufactured before 2000 3300 rpm
manufactured in 2000 or later 3900 rpm
(iv) more than 8 cylinders 4300 rpm
(v) If the engine is a rotary engine 4500 rpm
In the case of a motor cycle:
(i) for a two-stroke engine 3750 rpm
(ii) for a four-stroke engine:
from Harley Davidson 2500 rpm
from any other manufacturer 3000 rpm
In the case of a goods vehicle or bus, if the engine has:
(i) 6 cylinders or more 3000rpm
(ii) 4 cylinders and is
manufactured before 1970 2500rpm
manufactured in 1970 or later 3500rpm
Hope this clarifies things.
Edited by Redslur, 05 August 2009 - 03:45 PM.
#7
_Herne_
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Posted 05 August 2009 - 03:49 PM
Noise tests should be conducted as per the National Transport Commission requirements I have attached. It is a national document.
http://www.ntc.gov.a...DocumentId=1392
snip
Hope this clarifies things.
Gee Harleys get off damn light and they are the main offenders (MHO)
Not that I dont want one lol
Herne
Edited by Herne, 05 August 2009 - 03:49 PM.
#8
MRLXSS
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Posted 05 August 2009 - 03:56 PM
Not wrong about the Harley's! Living in the Hills, they would have to be the most annoying of all! Followed closely by V6 Commo's with droney exhausts! LOL
Its amazing that the Harley's have their own set of rules!
Its amazing that the Harley's have their own set of rules!
#9
_mello92_
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Posted 05 August 2009 - 04:15 PM
Its amazing that the Harley's have their own set of rules!
Too much money under the table I tell ya!
#10
_mumstaxi_
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Posted 05 August 2009 - 05:14 PM
Noise tests should be conducted as per the National Transport Commission requirements I have attached. It is a national document.
http://www.ntc.gov.a...DocumentId=1392
4.2.3.3 Where the ESMP for that engine has not been determined by the testing
authority then the engine shall be brought to and stabilised at a speed as close
as the testing officer can achieve to one of the following speeds:
In the case of a passenger car or derivative, if the engine has:
(i) 5 cylinders or less 4000 rpm
(ii) 6 cylinders and is
manufactured before 1995 3200 rpm
manufactured in 1995 or later 3600 rpm
(iii) 8 cylinders and is
manufactured before 2000 3300 rpm
manufactured in 2000 or later 3900 rpm
(iv) more than 8 cylinders 4300 rpm
(v) If the engine is a rotary engine 4500 rpm
In the case of a motor cycle:
(i) for a two-stroke engine 3750 rpm
(ii) for a four-stroke engine:
from Harley Davidson 2500 rpm
from any other manufacturer 3000 rpm
In the case of a goods vehicle or bus, if the engine has:
(i) 6 cylinders or more 3000rpm
(ii) 4 cylinders and is
manufactured before 1970 2500rpm
manufactured in 1970 or later 3500rpm
Hope this clarifies things.
Thanks that document clarifies what i thought
1.2 "Engine Speed at Maximum Power" ("ESMP") means the speed at which the engine
develops maximum power (rpm).
I think you will find that just about ANY Australian produced/released ADR approved car will have a "known" ESMP (and they have a book of all known individual engines ESMPs)
so.....
4.2.3.1 Where the ESMP for that engine has been determined by the testing authority
the engine shall be brought to and stabilised at a speed as close as the testing
officer can achieve to:
(i) � ESMP in the case of a pre ADR83 motor cycle
(ii) � ESMP in the case of any other motor cycle where the ESMP is
more than 5000 rpm; or
(iii) � ESMP in the case of any other vehicle.
So a aussie released V8 with a known ESMP will be at " tested at "� of Engine Speed at Maximum Power"
MT
Edited by mumstaxi, 05 August 2009 - 05:27 PM.
#11
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Posted 05 August 2009 - 05:17 PM
The above sounds about right, when i got tested (by choice just to see, as my exhuast shop does the tests) i was right on 96 and i think about 3500rpm. 75% rings a bell.
This was my purple one as some of you know, but that thing was really not loud at all.
Whats the specs of his engine and exhaust setup Bret???
This was my purple one as some of you know, but that thing was really not loud at all.
Whats the specs of his engine and exhaust setup Bret???
#12
LXCHEV
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Posted 05 August 2009 - 07:59 PM
It's a fairly healthy Holden 355 stroker - makes just over 200rwkw... extractors, twin system, Lukey mufflers, it really barks! (Sounds ace!).
Cheers for all the info and comments everyone.
The last time I had my Chev tested, I remember it was around 3,300 RPM, which is spot on with what you posted Redslur. I've heard of several other people being tested (V8's) at higher RPM (like 3500 / 3600) - so different testers seem to vary a little bit.
Before I slammed the V8 in mine - it had a 202 - I got pinged by the EPA in that too - it was tested at 3,200 RPM and was spot on 96dB - perfect! But higher revs really got it barking. As long as it passes at the testing RPM though, that's all I cared about.
Cheers for all the info and comments everyone.
The last time I had my Chev tested, I remember it was around 3,300 RPM, which is spot on with what you posted Redslur. I've heard of several other people being tested (V8's) at higher RPM (like 3500 / 3600) - so different testers seem to vary a little bit.
Before I slammed the V8 in mine - it had a 202 - I got pinged by the EPA in that too - it was tested at 3,200 RPM and was spot on 96dB - perfect! But higher revs really got it barking. As long as it passes at the testing RPM though, that's all I cared about.
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