RoyH Posted June 29, 2009 Share Posted June 29, 2009 It's noisy. I need to blag a meter to find out by just how much, but it's going to need addressing in order to make it more track friendly. So, which should be addressed first? Silencer or airbox? And which silencer and airbox? I have my views on both, but dont wish to influence people's opinions. Power retention is an obvious priority. Your thoughts, please. Taffybach boyo Link to comment Share on other sites More sharing options...
davidvoas73 Posted June 29, 2009 Share Posted June 29, 2009 Exhaust first, how about this one 😳 Sensible head on .... Get it static noise tested first (75% max revs), if its 98db or under then you should be ok at most tracks, for those that have driveby meters it may be a different story. If you do need to quieten it down, then does your R500 have a repackable silencer? If so have you opened it up to see if it needs a top up? If silencer is in good order then as you say airbox next ..... if you are a carbon tart then reverie seem to have options .... airborne tweaked supersport Link to comment Share on other sites More sharing options...
BenF Posted June 29, 2009 Share Posted June 29, 2009 Hi Roy You've read my thread on a near identical topic! I had my R300 tested at Bedford Autodrome. The chap there was very helpful. The main problem was getting into the place - the speed bumps are not Caterham friendly. When I was there, there was an R400 running with a standard cat and exhaust and he had passed the 100dB static test but had been told to lift off when going past the noise meter on track, as it was reading high values. So I would suggest your R500 will need a bit of help to run somewhere like that... Link to comment Share on other sites More sharing options...
RoyH Posted June 29, 2009 Author Share Posted June 29, 2009 Hi Ben. Bedford is close for me so would like to cosider it. Will see if I get more guidance on here. Otherwise will try a search. Taffybach boyo Link to comment Share on other sites More sharing options...
Grubbster Posted June 29, 2009 Share Posted June 29, 2009 For a single can Raceco seem to be preferred by many here, I have a Powerspeed 4-2-1 and sometimes struggle. To be certain of getting exhaust levels down you could have a twin silencer system from Powerspeed - whisper quiet (as proven by Atinods Busa) - second can runs along the back of the car. Intake is a very different game, I've struggled here also - I have the Bernard Scouse box which does make a good difference but on drive by I still have some difficulties. An extended intake and remote filter may help but I'm not sure how many have done this successfully. I've experimented with some flexible hose but don't really have any scientific method for testing - not easy to drive by (flat out) a volunteer holding a meter! Link to comment Share on other sites More sharing options...
RoyH Posted June 30, 2009 Author Share Posted June 30, 2009 Grubster, thanks. I'm thinking Ammo for the silencer. I've seen the airbox that DVA has had made and would be interested to have this fitted but dont know much about its noise attenuation. Anybody got one? How does it compare to the Scouse airbox? Also, which is the recommended first approach: silencer or intake? Taffybach boyo Link to comment Share on other sites More sharing options...
Mark Durrant Posted June 30, 2009 Share Posted June 30, 2009 I would start with the silencer as this will get you through noise tests where they only do a static test. An airbox will be required for circuits like Bedford, Goodwood and Donnington where driveby tests are used and monitored. In reality even with an airbox and a good silencer you will probably need a 105db day to stay within the noise limit. Mark D Link to comment Share on other sites More sharing options...
7 wonders of the world Posted June 30, 2009 Share Posted June 30, 2009 The DVA and Scouse boxes are one and the same, I beleive Bernard makes the boxes with input from Dave, I've got the Mk 2 version (allows the use of 90mm trumpets on Jenveys) fits a treat and kills great deal of induction noise and on the rollers at Emerald mine gave more power with the box! Too young to be old ! Link to comment Share on other sites More sharing options...
RoyH Posted June 30, 2009 Author Share Posted June 30, 2009 Mark, 7 Wonders. Thanks. Better find someone with a noise meter in order to kick this all off. Sounds lik a visit to Ammo followed by DVA. Would be a bit dissapointed if I had a silencer and airbox fitted and then wasnt much below 105 though.... Taffybach boyo Link to comment Share on other sites More sharing options...
Andy Whittle Posted June 30, 2009 Share Posted June 30, 2009 Hi Roy, You might find this info on the website interesting: Decibel (loudness) Comparison Charts I am Leg End... Link to comment Share on other sites More sharing options...
Jason Plato Posted June 30, 2009 Share Posted June 30, 2009 *biggrin*can i have your std can ? here is my Duratec R .... C7 TOP Taffia joint AO with Al Link to comment Share on other sites More sharing options...
Grubbster Posted June 30, 2009 Share Posted June 30, 2009 Roy it would be good to get some noise data on the Raceco fitted to R500 from someone that has one - if you are really wanting to reduce noise for trackdays then you only want to spend once and ideally want to make 98 or less. The rear exit 2 can Powerspeed will easily do this - I think Atinods Busa was around 108 when it went for SVA and this was with a large Powespeed can with cat fitted - after adding the second can they didn't even bother testing it (I have a meter so will do so soon but I suspect it will be less than 95). Ferrari Mark also runs a rear exit and has no problems getting on track. Link to comment Share on other sites More sharing options...
Jason Plato Posted July 1, 2009 Share Posted July 1, 2009 I have access to 2 accurate noise meters here in work that I can bring home or to an event if you wanted . here is my Duratec R .... C7 TOP Taffia joint AO with Al Link to comment Share on other sites More sharing options...
RoyH Posted July 1, 2009 Author Share Posted July 1, 2009 Have just spoken to Powerspeed, who are getting back to me. The rear exit exhaust is likely to give ground clearance issues on an R500; this is particularly importnant in my case. There is an incline leading into my house and I am already having clearance issues (or lack of it). Sump keeps scraping. Taffybach boyo Link to comment Share on other sites More sharing options...
RoyH Posted July 1, 2009 Author Share Posted July 1, 2009 Okay, ground clearance was a red herring. Rear exit exhaust system is doable, although not cheap !!! Guess I would make up some of the cost by being able to sell my current exhaust. Taffybach boyo Link to comment Share on other sites More sharing options...
7 wonders of the world Posted July 1, 2009 Share Posted July 1, 2009 Hi Roy, YHM's Link to comment Share on other sites More sharing options...
Gridgway Posted July 2, 2009 Share Posted July 2, 2009 I had the caterham rear exit exhaust and the caterham/reverie airbox. I got on everywhere including goodwood quiet days. The exhaust cost 7bhp against the then standard R500 exhaust- 222 v 229 (old Dave Walker RR). I'm sure I don't need to say it, but if you change airbox, please make sure there is no chance of sucking a clip into the induction. Graham Link to comment Share on other sites More sharing options...
anthonym Posted July 3, 2009 Share Posted July 3, 2009 Raceco is my choice, now some years of quietness. Next step would have been the box thing, but never became necessary in my case. and I can't find my noise meter... Edited by - anthonym on 3 Jul 2009 02:37:10 Link to comment Share on other sites More sharing options...
RoyH Posted July 3, 2009 Author Share Posted July 3, 2009 First step is to check the packing, which I'm hoping to do this weekend. Will be going to Bedford on 10th July (not tracking it), will get the car noise tested there. Subject to the results of the noise test, I will then need to look at whether to go for induction or exhaust noise first. The Powerspeed system will cost me nearly £1500 fitted. Too expensive. If I need to limit the exhaust noise (very likely), I'll be looking in the direction of Raceco. Dont want to put up with any power loss. Taffybach boyo Link to comment Share on other sites More sharing options...
6speedmanual Posted July 3, 2009 Share Posted July 3, 2009 Hi Roy I believe that Reverie now sell the R500 carbon fibre airbox/"gasmask" and under nosecone air scoop box parts, although not Caterham branded. As you are very interested in history and specifications of the K series R500s, maybe this is the wat to to keep authenticity? ps YHM Peter BRAWNGP green SUPERLIGHT FCITW 2009 😬 Link to comment Share on other sites More sharing options...
RoyH Posted July 3, 2009 Author Share Posted July 3, 2009 Peter, Thanks for that Not received your e mail. Taffybach boyo Link to comment Share on other sites More sharing options...
6speedmanual Posted July 3, 2009 Share Posted July 3, 2009 That's 'cos I hadn't written it yet but you should have it by now. P BRAWNGP green SUPERLIGHT FCITW 2009 😬 Link to comment Share on other sites More sharing options...
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