How LOUD are you. A poll!

BOURRET · #1 (**permalink**) 08-22-2006, 12:43 AM

Mine is sufficiently noisy to be refused at some tracks in England.
I have a dBmeter but I did not used it yet.

REPTYL · #2 (**permalink**) 08-22-2006, 01:26 AM

When I had the side pipes running I did a little test down the south eastern freeway.

Held the sound meter at my right ear while doing 100 k/ph.

109db at my ear!!!!!!

Let’s just say I started wearing earplugs while driving the Cobra long distances.

The exhaust now exits out the back of the car and I must say it's much nicer that way.

When I had the car engineered for the first time it blew 102db at the tip.
It had to be 92db 4 inches from the tip at 45 degrees at 2/3 max revs.
To get it to that I ran duel inch and five eighths exhaust with 2 commodore mufflers, four resonators and two and a half metres of chook wire jammed up the tail pipes.
From memory it blew 98db with out the chook wire. (max revs dropped to 4 grand when the wire was added).

What ever it takes, right.

Aussie Mike · #3 (**permalink**) 08-22-2006, 01:37 AM

Part of you problem Jason was that the measurement should have been taken a 525mm from the tip. 4" is way too close.

Cheers

REPTYL · #4 (**permalink**) 08-22-2006, 01:42 AM

OK so 4" was an estimate. It was 1998 for god sake!
I have trouble remembering what I had for breaky this morning, let alone engineering requirments for noise testing pre 2000.

400TT · #5 (**permalink**) 08-22-2006, 02:01 AM

Well your guess is as good as mine...

On the GT40 by time I fit headers, I've got room for an 11" muffler and an inch of pipe either side. No idea how I'm going to fit my large ricer exhaust tips in yet.

So I've got an 11" muffler &a few inches of pipe after the collectors...I reckon it's going to be real quiet.

Seriously though, my brother drives one of the quietest cars in the club...silent, but deadly. Hairdryers make for very effective mufflers.

OLSCHL · #6 (**permalink**) 08-22-2006, 02:06 AM

Hey Jas i saw you while back on your way up to Calder Park (i think) on Citylink (i was heading in the other direction) Could hear you coming from a mile away!! I reckon it was 109db at my ear on the other side of the road (over the other side of the barrier!!

Cameron Parsons · #7 (**permalink**) 08-22-2006, 02:29 AM

Ahh the wonders of the Roadster configuration. I think I have about 4 mtrs of exhaust to play with. Still run cats and mufflers. At highway speeds, it's a quiet burble. Give it a boot full and those 8 TB's start to protest

However, I got to drive Garretts beast at Winton... it was actually painful. But there is truth to the saying 'it's a fine line between pleasure and pain"

Cameron

2 X 2.5 Inch

Rob. Smith · #8 (**permalink**) 08-25-2006, 07:07 AM

Quote:

Originally Posted by REPTYL

When I had the side pipes running I did a little test down the south eastern freeway.

Held the sound meter at my right ear while doing 100 k/ph.

109db at my ear!!!!!!

Let’s just say I started wearing earplugs while driving the Cobra long distances.

The exhaust now exits out the back of the car and I must say it's much nicer that way.

When I had the car engineered for the first time it blew 102db at the tip.
It had to be 92db 4 inches from the tip at 45 degrees at 2/3 max revs.
To get it to that I ran duel inch and five eighths exhaust with 2 commodore mufflers, four resonators and two and a half metres of chook wire jammed up the tail pipes.
From memory it blew 98db with out the chook wire. (max revs dropped to 4 grand when the wire was added).

What ever it takes, right.

Ha Ha my car was so muffled through the temporary 2 into 1 system that the back pressure had to be removed with a vacuum cleaner before it would start. It only just passed because it made high pitched whistling noises that upset the decibel meter. A larger diameter pipe would have done the job !