R400K noise control....

[GPBox]

Hi all, delighted to have just upgraded to a R400K...am a tad concerned about the noise level for track days.

realise this is both an exhaust and an induction noise issue..

It's a 'standard' R400K setup Roller barrels and a dome/foam air filter..and exhaust is a re-packable system.

Whats the collective advice on getting to the 96-98db target ?..or do I need to look for 'noisy' TD's now ?

Cheers all, Graham

[SLR No.77]

For the induction the ideal situation is to fit the R500 airbox kit, this was a £1000 option from Caterham although no longer available. They were made by Reverie so you can buy all the bits (branded Reverie) to assemble what you need yourself, I think the cost is around £650 if you go for everything. They do appear secondhand occasionally although they're pretty rare.

Stu.

[rj]

I have a 100mm inlet Bernard Scouse airbox on my +200BHP K-car and the R500 rear exit exhaust system.

We have a strict 95dB noise limit on my local circuit. I have never had any issues at all, so it can be done.

A carbon airbox may not be the best as it will not be as "dead" as GRP. This can be dealt with though and as I have posted elsewhere I have foam on the inside of my airbox which reduces the level around 4dB (!)

 

 

[Jonathan Kay]

...am a tad concerned about the noise level for track days.

NB:

1. It's now possible to measure sound level with an app on a smart 'phone.
2. Many scrutineers at circuits are enthusiasts and will run a static check for nonparticipants. It's probably wise to wait for the morning rush to subside.

Jonathan

[A10ROX]

Passing static is easy if you don’t declare the true rpm limit ...

your problem will be drive-by if you drive by exploiting its true potential

airbox and bigger exhaust even with rear exist will get you to 96-98dB... at the loss of ultimate performance

Before spending money on silencing try a noise-day track event ... you won’t go back

spend a bit of time on set-up and put some slicks on ... the R400K is such a sweet spot ... well done

[Tazio]

The Reverie boxes are also on the AT Power site too.

[GPBox]

thanks all !....great comments as always.....