R400 Noise levels

[jem72]

I have just booked myself a track day at Brands Hatch and they have a 105db noise limit any idea what level the R400 puts out on a standard non cat exhaust?

Thanks.

[ewenm]

105 is pretty high so I'd be surprised if a standard R400 was that loud.

[jem72]

Lets hope not although it always feels my ears are going to explode when shifting it.

[ewenm]

There were R300, 400 and 500s at a trackday on Anglesey on Good Friday and they didn't get black flagged - I think the noise limit there is less that 105.

[dannylt]

I didn't realise Anglesey actually do a noise check or have mikes? But 105db is pretty noisy. Why not ask the organiser - which track day is it? (I'm there on May 10th, and very loud!).

[ewenm]

I saw Jonny (BookaTrack) doing a noise test of one car...

[rubystone]

roller barrels are pretty noisy, but so are 45DCOEs and I've never been stopped at Brands

[barrythompson]

ewenm said:

There were R300, 400 and 500s at a trackday on Anglesey on Good Friday and they didn't get black flagged - I think the noise limit there is less that 105.

I tested my new duratec at anglesey there last Saturday, on the throttle body side of the car with jonny stood on the pit wall we got 98,99 and 100db at approx 8-10m from the car @ full throttle. As far as i am aware they have no noise meters at anglesey but look out for noisy cars and ask for them to be checked, I suppose this may change when the revamp starts later this year and they may get some meters installed.

Cheers

BT

[jem72]

dannylt said:

I didn't realise Anglesey actually do a noise check or have mikes? But 105db is pretty noisy. Why not ask the organiser - which track day is it? (I'm there on May 10th, and very loud!).

MSV are organising it (3rd May) they were unsure and offered a free noise test before I go there but as its £99.00 I think I'll take a risk and just turn up on the day.

[jackal]

Brands will pull you up for noise but its VERY rare.... i got stopped last time i was there because my exhaust was out of packing and i was way beyond 110db on a static test but that is just a silly amount of loudness. In all my years of going to trackdays im about the only person who i know who has had a problem there. an R400 wont even break 102-ish

>> Edited by jackal on Sunday 23 April 20:05

[bertie]

My R400 on standard exhaust was measured at 102.8 dB drive by at Donnington.

[jem72]

Had a great evening at Brands Hatch yesterday, had the car noise tested and it came out at 107db at 6K. I wanted to go to Bedford which has a noise limit of 101db, any ideas on a new exhaust which can be fitted near to SW London?

[Shaun_E]

Cheapish option is the Caterham 7" silencer - not repackable though.
If you want a repackable silencer then Raceco do a really nice titanium sleeved one or you could try any of EBD, Powerspeed, Techcraft (don't have URL), etc.

[bertie]

The Raceco is by far the best IMHO and that of a huge number of Caterham owners.

It's very light and yet very quiet (relatively speaking) but you still will struggle as most of the noise on R300/400/500 comes from the induction side so you'll be needing an airbox to help calm that.

On those you're looking at either the Reverie/ Caterham one (circa £450) or I think there's a bulk buy on Blatchat at the moment for a Pipercross one which is cheaper.

[jem72]

Thanks for your replies, just had a chat with Raceco and they sound like a good bet. Hopefully this will sort things without the need to modify the induction.

[bertie]

I doubt it to be honest, didn't for me but I was trying to comply with 98dB drive by at Donnington, but let us know how you get on.

[jackal]

107 ???

you must have zero packing in there like me
a std R400 is generally a lot quiter than that

[Curley]

For what its worth , my r400 registered 105 db at the noise test at Goodwood.

This is for a standard " road " car with standard short silencer and cat bypass pipe.

5000 miles from new.

Did a track day at Brands last year and had no problems

[Shaun_E]

My car is a 227bhp K series and I was measured at a recent sprint - the result was 94 db @5000 rpm (about 2/3 max) 0.5m from the pipe. This is using the Caterham 7" race silencer. If you are reading 105db then you need to get a bigger silencer.
I am also running a Bernard Scouse airbox to reduce induction noise.

[jackal]

Curley said:

For what its worth , my r400 registered 105 db at the noise test at Goodwood. This is for a standard " road " car with standard short silencer and cat bypass pipe. 5000 miles from new. Did a track day at Brands last year and had no problems

yep, packing all gone after that sort of mileage i would imagine. My packing went in about 5 trackdays.