Supersprint system - 102db - any ideas on quietening? - Page 2

titan · 02-03-2011, 10:01 AM

Hmmmmmm

one of the guys here runs the SXOC and has brought in their sound meter.

OK so distance and angle may be different to what the guys at Oulton do, but we measured 95.3db at 5k rpm. Somewhat different to 102db.

The OEM cats are going back on today, so we'll get another measurement where at least the method/meter/person is the same so I can see if the OEM cats do bring it down a bit.

**glendog74** · 02-03-2011, 10:15 AM

That's the snag with circuit noise testing - they all vary in measuring device/method and of course end results...

When i had just the Super Sprint race back box fitted to the OEM system, i was measured at a consistant 97dB at various circuits including the Ring and Oulton Park. At Cadwell Park, however, they claimed it was running at 101dB... Pah!

**shimmy** · 02-03-2011, 12:43 PM

Make sure it is measured outside without other sound sources.

It needs to be held at 45 degrees to the direction of the tail pipe and 0.5m away.(they have a 0.5m stick)

Climatic conditions make it very different on drive by and rpm makes it different testing as they seem to ask for different rpm levels

DuncanR · 02-03-2011, 01:40 PM

I never failed a noise test yet with my set up !

http://www.youtube.com/watch?v=YC_gwIrOiDs

titan · 02-03-2011, 05:45 PM

heh thats pretty good, might try that :-)

To add insult to injury, the local garage we use for stuff couldn't get the csl onto their ramps so looks like i'll be changing those cats out myself from underneath the car in the freezing cold. nice.

**shimmy** · 02-03-2011, 07:46 PM

Quote:

Originally Posted by titan

heh thats pretty good, might try that :-)

To add insult to injury, the local garage we use for stuff couldn't get the csl onto their ramps so looks like i'll be changing those cats out myself from underneath the car in the freezing cold. nice.

Woppum was at Snett 2 years ago with full SS and cats and no issues

**glendog74** · 02-03-2011, 07:52 PM

Quote:

Originally Posted by shimmy

Woppum was at Snett 2 years ago with full SS and cats and no issues

It helps that Snett is in the 'middle of nowhere' of course

titan · 03-03-2011, 04:43 AM

Also at woodbridge (javelin) on sat...nextdoor to an army base so they get a bit funny about noise.

**shimmy** · 03-03-2011, 06:43 AM

Quote:

Originally Posted by titan

Also at woodbridge (javelin) on sat...nextdoor to an army base so they get a bit funny about noise.

Hmmmm

In the CSL on a runway, your Tyres will be goosed

**glendog74** · 03-03-2011, 10:48 AM

Quote:

Originally Posted by shimmy

Hmmmm

In the CSL on a runway, your Tyres will be goosed

02-03-2011, 10:15 AM	#12
glendog74 CSL Register Uber-poster! Tetris Champion! Join Date: Apr 2008 Location: Cornwall Posts: 8,861 Casino cash: $32299	That's the snag with circuit noise testing - they all vary in measuring device/method and of course end results... When i had just the Super Sprint race back box fitted to the OEM system, i was measured at a consistant 97dB at various circuits including the Ring and Oulton Park. At Cadwell Park, however, they claimed it was running at 101dB... Pah! __________________ Cha'mone Mother F**ker!

02-03-2011, 12:43 PM	#13
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	Make sure it is measured outside without other sound sources. It needs to be held at 45 degrees to the direction of the tail pipe and 0.5m away.(they have a 0.5m stick) Climatic conditions make it very different on drive by and rpm makes it different testing as they seem to ask for different rpm levels __________________ .

02-03-2011, 10:01 AM	#11
titan S5 - Full Throttle Join Date: Aug 2010 Posts: 268 Casino cash: $1363	Hmmmmmm one of the guys here runs the SXOC and has brought in their sound meter. OK so distance and angle may be different to what the guys at Oulton do, but we measured 95.3db at 5k rpm. Somewhat different to 102db. The OEM cats are going back on today, so we'll get another measurement where at least the method/meter/person is the same so I can see if the OEM cats do bring it down a bit.

02-03-2011, 05:45 PM	#15
titan S5 - Full Throttle Join Date: Aug 2010 Posts: 268 Casino cash: $1363	heh thats pretty good, might try that :-) To add insult to injury, the local garage we use for stuff couldn't get the csl onto their ramps so looks like i'll be changing those cats out myself from underneath the car in the freezing cold. nice.

03-03-2011, 04:43 AM	#18
titan S5 - Full Throttle Join Date: Aug 2010 Posts: 268 Casino cash: $1363	Also at woodbridge (javelin) on sat...nextdoor to an army base so they get a bit funny about noise.