lowering my db readings

billyboysm3 · 25-10-2011, 03:10 PM

Got tested last Thursday at Snetterton and measured 113db

But the car was sat by the testing station for 45min-1 hour while the briefing was on, plus cold.

Got told to go home, luckily they let me re-test, after a nice drive around Norfolk admiring the views I measured 105db.

They did put the probes in the exhaust and I thought it was read from 1m away?

Car has Supersprint cats, centre pipe and lightweight supersprint back box.

Is it as simple as getting the back box repacked or to be total sure putting the OEM back box on (which id need to buy)?

Billy

**DazBlackCSL** · 25-10-2011, 03:33 PM

Quote:

Originally Posted by billyboysm3

Got tested last Thursday at Snetterton and measured 113db

But the car was sat by the testing station for 45min-1 hour while the briefing was on, plus cold.

Got told to go home, luckily they let me re-test, after a nice drive around Norfolk admiring the views I measured 105db.

They did put the probes in the exhaust and I thought it was read from 1m away?

Car has Supersprint cats, centre pipe and lightweight supersprint back box.

Is it as simple as getting the back box repacked or to be total sure putting the OEM back box on (which id need to buy)?

Billy

Can't believe it was that loud, had the same ( well miltek cats ) but was never over 100 ... dodgy testing equipment more than likely, or keep you revs a bit lower

billyboysm3 · 25-10-2011, 03:45 PM

Quote:

Originally Posted by DazBlackCSL

Can't believe it was that loud, had the same ( well miltek cats ) but was never over 100 ... dodgy testing equipment more than likely, or keep you revs a bit lower

Kept rev's V low, remember reading a thread on here by Duncan and leaving it on 5k, but the other inspector ended up making sure I was dead on the 6k mark

Perfectly fine when on track.

billyboysm3 · 25-10-2011, 03:47 PM

Also probe was shoved in exhaust and not half a metre away/45° angle.

mattCSLnut · 25-10-2011, 04:50 PM

Quote:

Originally Posted by billyboysm3

Got tested last Thursday at Snetterton and measured 113db

But the car was sat by the testing station for 45min-1 hour while the briefing was on, plus cold.

Got told to go home, luckily they let me re-test, after a nice drive around Norfolk admiring the views I measured 105db.

They did put the probes in the exhaust and I thought it was read from 1m away?

Car has Supersprint cats, centre pipe and lightweight supersprint back box.

Is it as simple as getting the back box repacked or to be total sure putting the OEM back box on (which id need to buy)?

Billy

Resonated SS centre pipe (to replace your straight through one) should bring your decibel numbers down Billy

The OEM back box is too quiet

& very heavy

billyboysm3 · 25-10-2011, 05:22 PM

Quote:

Originally Posted by mattCSLnut

Resonated SS centre pipe (to replace your straight through one) should bring your decibel numbers down Billy

The OEM back box is too quiet

& very heavy

So quiet I could pass the db test at Bedford?

**glendog74** · 25-10-2011, 05:46 PM

It will be the SS cat section that adds the most noise.

I have SS manifold, SS unresonated centre section & SS Lightweight Racing back box but with OEM cat and i measure 100db (warm).

I had the same issues when running a full Milltek system - once i replaced the Miltek cat for OEM it was bearable!

**DazBlackCSL** · 25-10-2011, 05:51 PM

Quote:

Originally Posted by glendog74

It will be the SS cat section that adds the most noise.

I have SS manifold, SS unresonated centre section & SS Lightweight Racing back box but with OEM cat and i measure 100db (warm).

I had the same issues when running a full Milltek system - once i replaced the Miltek cat for OEM it was bearable!

Had you taken the fluffy pink sheaf of your pipes as that would of helped

**glendog74** · 25-10-2011, 05:58 PM

Quote:

Originally Posted by DazBlackCSL

Had you taken the fluffy pink sheaf of your pipes as that would of helped

Bounce · 25-10-2011, 06:13 PM

Quote:

Originally Posted by DazBlackCSL

Had you taken the fluffy pink sheaf of your pipes as that would of helped

25-10-2011, 03:10 PM	#1
billyboysm3 CSL Register Uber-poster! Join Date: May 2011 Posts: 3,001 Casino cash: $25206	lowering my db readings Got tested last Thursday at Snetterton and measured 113db But the car was sat by the testing station for 45min-1 hour while the briefing was on, plus cold. Got told to go home, luckily they let me re-test, after a nice drive around Norfolk admiring the views I measured 105db. They did put the probes in the exhaust and I thought it was read from 1m away? Car has Supersprint cats, centre pipe and lightweight supersprint back box. Is it as simple as getting the back box repacked or to be total sure putting the OEM back box on (which id need to buy)? Billy

25-10-2011, 05:46 PM	#7
glendog74 CSL Register Uber-poster! Tetris Champion! Join Date: Apr 2008 Location: Cornwall Posts: 8,861 Casino cash: $32299	It will be the SS cat section that adds the most noise. I have SS manifold, SS unresonated centre section & SS Lightweight Racing back box but with OEM cat and i measure 100db (warm). I had the same issues when running a full Milltek system - once i replaced the Miltek cat for OEM it was bearable! __________________ Cha'mone Mother F*ker! Last edited by glendog74; 25-10-2011 at 05:49 PM.*

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25-10-2011, 03:47 PM	#4
billyboysm3 CSL Register Uber-poster! Join Date: May 2011 Posts: 3,001 Casino cash: $25206	Also probe was shoved in exhaust and not half a metre away/45° angle.