boughtoneatlast Posted February 6, 2004 Share Posted February 6, 2004 Hi all I run a tweaked 1.6ss, with throttle boddies etc....... I have just had car noise tested at Bedford Autodrome and on a drive by failed with 88/89 dbs.... only when passing the sensors on the induction side, the static exhaust was 97dbs well within the limit! I have the standard bonnet (no hole for induction) and therefore run with the sock type filters (Piper Cross) on each trumpet..... 🤔 How can I bring down this noise level, has anyone else encountered this problem (silly question!!) would an air box or similar work,? and if so where could I get it and any advice on what might be needed to fit it Many thanks Ex 1.6 SS, now 186bhp!!, it flies Link to comment Share on other sites More sharing options...
Mark Durrant Posted February 6, 2004 Share Posted February 6, 2004 Take a look here. Mark D Su77on Se7ens Making plans for the 2004 Sprint Season Link to comment Share on other sites More sharing options...
AMMO Posted February 6, 2004 Share Posted February 6, 2004 Mark Thanks for the link. Very interesting. They are using different length trumpets on the race Elise airbox. Something I advocated some months ago and that is used regularly on 4 cylinder race bikes. I'm glad somebody has finally done it and it works. AMMO Link to comment Share on other sites More sharing options...
boughtoneatlast Posted February 6, 2004 Author Share Posted February 6, 2004 Mark thanks for this Have you experienced it, does it make the car quieter?? I have Jenvey TB's, does this conversion work on them, it looks good, looks like it might be quieter.... Desperate to get the noise down for track days, to be honest, I love the way it sounds normally!!! Gary Ex 1.6 SS, now 186bhp!!, it flies Link to comment Share on other sites More sharing options...
oilyhands Posted February 6, 2004 Share Posted February 6, 2004 Bernards (autoteknix) airbox is made specially for the Jenvey TBs, I've installed about 15 and they considerably reduce induction noise and help to deliver cold air to the TBs, they will just accomodate 90mm trumpets. Ammo, the unequal length trumpets work a treat on Steve Butt's car bringing up the mid range torque substantially, but the cylinder may need indivudal trims to the fuelling. Oily Link to comment Share on other sites More sharing options...
AMMO Posted February 6, 2004 Share Posted February 6, 2004 Oily The dyno sheet is impressive. Regarding fuelling, the Jap fours have a single Uego sensor in the exhaust so the mapping is a compromise. Even though the fuelling may not be perfect on either the bikes or this particular Elise the improvement is so great, is it really that important? If money was no object then a sensor in each header and each cylinder indivdually mapped would be perfect. This is what I did on my old race Guzzi and what is still done on all race twins like Ducatis. I've just got a prototype fibreglass air box from Arnie to chop about and fit to my Duratec. I may try some mega-long inlets on the dyno. It could take up to 250mm trumpets if I do away with the internal filter an fit one remotely. Hope Arnie doesn't read this 😬 AMMO Link to comment Share on other sites More sharing options...
ChrisC Posted February 6, 2004 Share Posted February 6, 2004 Had the same problem in October at Bedford, but had done 4 other Bedford days during the year without problem. Was it a cold day? I have invested in a noise meter from Maplins, and when the salt goes (soon I hope) I am going to do some testing so I can have a few tricks up my sleeve just I case it happens again. I was only just over the 87 db limit, so I am going to test Tyre Pressures Low rev limits Throttle mods, to prevent full throttle and air filter mods. I feel its better to have 90% throttle and stay on the track, than taking an early bath. If I can get that noise down, the an air box will be the next option. That’s my plan anyway Chris.... H15 SVN Get it ! Link to comment Share on other sites More sharing options...
boughtoneatlast Posted February 6, 2004 Author Share Posted February 6, 2004 Chris We tried most of those!!!! And it did 1 lap fine until he got used to the fgact that even in the wet with 32rs he could really drive it, then as the car came on song - the red flag on the noise computer came up!!!! So its the box for me! Gary Ex 1.6 SS, now 186bhp!!, it flies Link to comment Share on other sites More sharing options...
fatcat Posted February 6, 2004 Share Posted February 6, 2004 FWIW, a Reverie carbon airbox and one of Ammo's Raceco silencers got my SV R500 through all the Bedford noise tests last summer with no problems. regards fc Link to comment Share on other sites More sharing options...
boughtoneatlast Posted February 6, 2004 Author Share Posted February 6, 2004 Hi FC Whats a reverie carbon box and who sells it The exhaust is a new powerspeed one and only registered 97 dbs, the main noise I get is from the induction side Gary Ex 1.6 SS, now 186bhp!!, it flies Link to comment Share on other sites More sharing options...
dino ferrana Posted February 6, 2004 Share Posted February 6, 2004 It is a carbon airbox made by Reverie. Quite pricey though. Link to comment Share on other sites More sharing options...
fatcat Posted February 6, 2004 Share Posted February 6, 2004 try www.reverie.ltd.uk Mine was fitted by Caterham from new, then re-fitted by Hyperion so that the air inlet in the nose cone was re-positioned to avoid scooping up catseyes, etc. It is an expensive bit of kit and not trivial to fit soif you want to get one and you're a mechanical dunce like me it may be worth at least talking to someone like David Epstein (Hyperion 01787 478 800) regards fc Link to comment Share on other sites More sharing options...
ChrisC Posted February 6, 2004 Share Posted February 6, 2004 Hi Gary You can compare my car with yours, because my induction noise comes from a pair of 45’s. But I had no problem during the Summer, only during a cold day in October. So I now have a number of aids to reduce this, one of them is a noise meter, and a pit to car radio to tell me to keep it down. The noise meter is well worth the investment, before you spend on anything else, because it sound like you where only just over the limit like me, and a little tweek or a warmer day is all that’s needed to avoid the noise problem. Either way, hope to see you soon at Bedford 😬 Chris.... H15 SVN Get it ! Link to comment Share on other sites More sharing options...
New Barbie Posted February 6, 2004 Share Posted February 6, 2004 I have a 1.6SS with throttle bodies, I am fitting the airbox here from DitP. I'd say the induction noise issues you have should be helped with an airbox, if only because the noise is going to be directed away from the side of the car; ram and/or cooler air will help as well. shrewdcookie - my Caterham site - UPDATED ! Link to comment Share on other sites More sharing options...
boughtoneatlast Posted February 9, 2004 Author Share Posted February 9, 2004 Count Thats some air box!!!.... Why so large?? whats the benefits? Gary. Ex 1.6 SS, now 186bhp!!, it flies Link to comment Share on other sites More sharing options...
dvhea11 Posted May 19, 2004 Share Posted May 19, 2004 hi Count, great air set-up ! who are DitP please ? also, have you got any photos of how your bonnet looks now and how it all looks with the bonnet on ? many thanks Maddox Link to comment Share on other sites More sharing options...
AMMO Posted May 19, 2004 Share Posted May 19, 2004 Maddox Dog in the Park is our very own Arnie "big boy" Webb. 287 bhp and rising! He had an airbox in the For Sale section recently. AMMO Link to comment Share on other sites More sharing options...
dvhea11 Posted May 19, 2004 Share Posted May 19, 2004 whoops ! cheers Ammo regards M Link to comment Share on other sites More sharing options...
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