WALKER

Does anybody know what the legal Decibel reading is for a road car exhaust.

I`m a bit concerned with the loudness of my new back box. Its reading 104db at 1.5 meters at 4000rpm.

I know that this is illegal on many tracks, but does anybody know what the law states for road cars?

Paul

Pardon..did somebody say something

Jacko

Hi yer Paul,
Just to concur, I have tried to investigate the numbers you require, but have only so far obtained the following for tracks:

STATIC TEST: 101dB(A) @ 4500rpm from Tailpipe

DRIVE BY: 87dB(A) @ Full throttle, 20m from centre line of the vehicle passing at least 60mph and accelerating to the max.

I will try and dig further for the road levels, but I believe that this figure is 74dB(A) total Drive by !

Cheers Jacko.

WALKER

Cheers Darren

Look forward to your findings

Paul

TURBO7379

Don't know if this is relevant but here are the health and safety regulations regarding noise from a course I recently done .
At 85 dB ear protection is recommended , at 90 dB it is compulsary in the workplace .
The maximium allowable exposure time is 8 hours at 90 dB .
Every 3 dB increase halves the length of exposure before hearing damage occurs .
So at 104 dB max exposure time is 20 mins .

robby

Hi, does this mean the Magnex back box with straight through centre pipe isn't road legal

Robby

MarkF

At rally scrutineering the limit is 100db@ 4500rpm. I think the distance is 1 meter and the measuring device is held at a 45 degree angle pointing downwards to the tailpipe.

WALKER

Thanks for the info chaps!

I think the Magnex box is perfectly allright, the wife has one on her P1.

Paul

LES H'

paul
I think the EU regulations state 88db

LES H'

PAUL
Ithink the EU regulations are 88db

ransj

For the SVA test it is 101dB at 1 meter (up, out and back).

I got a noise meter a couple of weeks ago as we were trying to get a twin bike-engined car through SVA (this was _quite_ loud!)

Simon

[This message has been edited by ransj (edited 02 April 2001).]

Pete Croney

My car was tested at Bedford on Friday.

at 0.5m 4500rpm, it was 86dB.

That's with a full system.

A P1 and 22B, both with the full system were similar readings.

WALKER

Thanx lads!