GPBox Posted June 24, 2018 Share Posted June 24, 2018 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 Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted June 24, 2018 Leadership Team Share Posted June 24, 2018 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. Link to comment Share on other sites More sharing options...
rj Posted June 24, 2018 Share Posted June 24, 2018 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 (!) Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 24, 2018 Member Share Posted June 24, 2018 ...am a tad concerned about the noise level for track days.NB: It's now possible to measure sound level with an app on a smart 'phone. 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 Link to comment Share on other sites More sharing options...
A10ROX Posted June 24, 2018 Share Posted June 24, 2018 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 potentialairbox and bigger exhaust even with rear exist will get you to 96-98dB... at the loss of ultimate performanceBefore spending money on silencing try a noise-day track event ... you won’t go backspend a bit of time on set-up and put some slicks on ... the R400K is such a sweet spot ... well done Link to comment Share on other sites More sharing options...
Tazio Posted June 24, 2018 Share Posted June 24, 2018 The Reverie boxes are also on the AT Power site too. Link to comment Share on other sites More sharing options...
GPBox Posted June 24, 2018 Author Share Posted June 24, 2018 thanks all !....great comments as always..... Link to comment Share on other sites More sharing options...
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