lowering my db readings

[billyboysm3]

Got tested last Thursday at Snetterton and measured 113db :bigcry: :banghead:
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]

Got tested last Thursday at Snetterton and measured 113db :bigcry: :banghead:
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 :whistle:

[billyboysm3]

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 :whistle:

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 :banghead:

Perfectly fine when on track.

[billyboysm3]

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

[mattCSLnut]

Got tested last Thursday at Snetterton and measured 113db :bigcry: :banghead:
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 :thumbs:
The OEM back box is too quiet :bigcry: & very heavy :banghead:

[billyboysm3]

Resonated SS centre pipe (to replace your straight through one) should bring your decibel numbers down Billy :thumbs:
The OEM back box is too quiet :bigcry: & very heavy :banghead:

So quiet I could pass the db test at Bedford?

[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!

[DazBlackCSL]

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 :smt047

[glendog74]

Had you taken the fluffy pink sheaf of your pipes as that would of helped :smt047


:bigcry: :hahaha: :hahaha:

[Bounce]

Had you taken the fluffy pink sheaf of your pipes as that would of helped :smt047:hahaha::hahaha:

[mattCSLnut]

So quiet I could pass the db test at Bedford?

Before I had the SS Race lightweight back box fitted, my mish mash 'xorst configuration was SS Cats, Miltek MK2 middle + OEM CSL back box and the readings were always around 89 db, Bedford included so in a word... Yes :thumbs:

[shimmy]

Billy

If you want to do Bedford a few times just dump the centre section and put back OEM

Will make your life much easier and quieter :thumbs:

[billyboysm3]

Cheers Shimmy/Matt, not got a OEM Cats or back box so Ill be on the look out.

Failing that I can pick a standard m3 back box up for £50 on ebay, not as light but if I want to shift some weight I can chuck the old man out of the passenger seat to save 16 stone.

Unless anyone has any of the above they want to sell?

Billy

[DuncanR]

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 :banghead:

Perfectly fine when on track. I discovered a better method !!


http://www.cslregister.com/forum/showthread.php?t=4596&highlight=noise+test