Noisy supersprint track days

[gav]

Ive got a cs, i know its not a csl, but we are from the same family?

Basically, ive got a noisy supersprint system which ive been getting grief when travelling to track days ( from scotland). Particularly croft and oulton.
Ive got a lightweight racing back box, and what i think is an unresonated x pipe centre section, and normal front cats. Am not 100% sure re centre section as not had a look and not an expert, but mechanic says is wide bore un silenced centre supersprint centre part.

How best to drop a few db?

I dont want to be sent home. Am sure will be fine, but have a few belgian trips, few oultons and dont want any hassle.

I,like the drone, but wouldnt miss it. Dont want to drop too many horse, or go to a huge expense.

Any thoughts folks?

Track day bolt on's

Change centre to what?

How best to check?

Thanks,

Gav

[shimmy]

i have 100 cell cats, res cetnre and lght race back box and no issues with noise anywhere inc oulton, bedford and snett.

billys is non res centre and was much worse,

id say take out the centre section and replace with OEM. It makes it quieter, less droney and no diff to bhp:thumbs:

[gav]

Cheers.....

You would expect then ours would have similar volume?


Oem fit race box without much fuss?

Would centre section be saleable?

[giraffe]

Cheers.....

You would expect then ours would have similar volume?


Oem fit race box without much fuss?

Would centre section be saleable?

Its the lack of silencer in center section that makes it so loud / sounds like the same center Billy has/had . OEM center section will bolt up to super sprint back box no problem

[chrisburns]

.

[glendog74]

You'll be fine at most track days with that setup except maybe Castle Combe and Croft as you've already mentioned. Bedford is always a pain due to the airbox noise afaik.

I have SS manifold, unresonated centre and lightweight race back box mated to a standard cat section - 100db - very few issues.

[billyboysm3]

Ive got a cs, i know its not a csl, but we are from the same family?

Basically, ive got a noisy supersprint system which ive been getting grief when travelling to track days ( from scotland). Particularly croft and oulton.
Ive got a lightweight racing back box, and what i think is an unresonated x pipe centre section, and normal front cats. Am not 100% sure re centre section as not had a look and not an expert, but mechanic says is wide bore un silenced centre supersprint centre part.

How best to drop a few db?

I dont want to be sent home. Am sure will be fine, but have a few belgian trips, few oultons and dont want any hassle.

I,like the drone, but wouldnt miss it. Dont want to drop too many horse, or go to a huge expense.

Any thoughts folks?

Track day bolt on's

Change centre to what?

How best to check?

Thanks,

Gav

Gav, just seen this, my setup was
SS Cats / SS centre section and SS lightweight back box = Loud
Best its been when warm is 105db so right on the limit.
Worst 111db at Snett.

Last weekend I changed the centre section to standard. This has made a massive difference. Still got low end drone but a great deal quieter over 3k revs. Going to get this DB tested at the weekend at either Bedford or Snett so Ill let you know how I get on.

Billy

[gav]

Cheers for the tips folks.
Billy, im very interested to hear how you get on please.
Where best to pick up standard centre section?
Was thinking about asking one of the companies that fit supersprint set up and ask if they'd be willing to sell one taken off another car. Thorney?

What thoughts please?

[Bounce]

Cheers for the tips folks.
Billy, im very interested to hear how you get on please.
Where best to pick up standard centre section?
Was thinking about asking one of the companies that fit supersprint set up and ask if they'd be willing to sell one taken off another car. Thorney?

What thoughts please?

You could also ask Simpson motorsport,they have done a few.

[billyboysm3]

Cheers for the tips folks.
Billy, im very interested to hear how you get on please.
Where best to pick up standard centre section?
Was thinking about asking one of the companies that fit supersprint set up and ask if they'd be willing to sell one taken off another car. Thorney?

What thoughts please?

Or see if the CS centre pipe is the same as a standard M3, if so there are normally a few about on ebay or m3cutters.

Gareth should know.

If the weather is ok here at the weekend Ill get it DB tested but doesnt look good, as Snett is the closest track to get tested on Sat.

The Supersprint centre pipe is one circular pipe that allows the air to flow free.

Im hoping changing the centre section gets me down to 102db

Watch this space

[billyboysm3]

Gav, so you have standard cats, SS centre Pipe and lightweight race and failing static 105db test?

[flow_csl]

I have SS headers , SS metallic cats , SS resonated center pipe and race backbox (not lightweight) .
And my car is around 95 DB .

[gav]

Basically Billy that is right.
Havent personally looked at centre section as cant get that far under.
But mechanic say... Standard cats, larger bore centre section that supersprint on it. So presume that is right
Defo has lightweight racing back box.

I havent failed any noise tests, but have got grief and raised eybrows from them nearly every time at croft and oulton. Got sent away last time, but after pleading etc.

Just dont want to be prevented from going on at any point if i can prevent it.
Particulatly if there is a straightforward solution.

Once was defo due to poor revving technique at testing... Pops etc being quite noisy.

[shane@mbtech]

I am intrigued to see what db my GTR will be kicking out, its not too loud when stationary, but being a turbo the noise under load increases more so than N/A.

Hope I dont get kicked off.

[AlexGTT]

Standard cats, SS resonated centre section and SS lightweight race backbox is good for all TD's, takes away rasp (which I really like) and sounds good.