Simondann111s Posted August 20, 2006 Share Posted August 20, 2006 Is this still open then? I'm in need of an airbox Link to comment Share on other sites More sharing options...
rj Posted August 20, 2006 Share Posted August 20, 2006 No, the bulk buy i not dead, and is not closed. I'm about to test the airbox on my own Jenvey TB'd car. It has immediately produced a noise reduction of approximately 6 db on drive by, where the meter was placed on the RH roadside, and I aimed to pass at the same distance and at 7.000 RPM. THis was done ten times, and the noise figure I got went down from 102 to 96db. Fitting foam to the outside of the box has further reduced the noise with 2 ish db. This is lightweight foam, 20mm thick, just to prevent the "top" of the box from flexing as is is fairly flimsy. The foam is self adhesive and almost impossible to remove, hence applied to Gaffa tape, which may be a noise reduction itself as it prevents the surface from vibrating. I have fitted the box on the trumpet ends, which moves it as far from the TB's as possible, as there is plenty of room under the bonnet with the relatively short DTH Jenveys. As for power figures I have not yet managed to get the car on a rolling road, but from my wideband lambda AFR meter, I can see that - with the same map - the engine runs lean at 4k RPM at part throttle, which to me indicates a better air flow, on the other hand does it run slightly rich on max RPM and full welly. To obtain the same AFR at max RPM I had to reduce the fueling by approximately 2%, which I'd assume will be equivalent to the power loss. This is compared to no air filter or anything to disturb the air flow. I haven't even fitted the hose that came with the airbox as I want to make an air intake over the rad if possible. I hope this makes sense, if not please do not hesitate to ask as English, as you know, is not my native language... Growing old is mandatory - Growing up is optional Link to comment Share on other sites More sharing options...
neil.cavanagh Posted April 16, 2007 Share Posted April 16, 2007 Just for peoples interest I bought one of there Pipercross airboxes from Burton Power last week. It fits perfectly onto the R500 rollerbarrels, with no particular stress or strain on it. My car needs a few more days work on it before I can start it so I'll have to wait a while to see how the airbox works. I'll then be off for a rolling road session. I'll hoping to map with the airbox in situ, see waht power that gives, and then have a run with a normal airfilter to see if the airbox is causing any loss/gain of power. Link to comment Share on other sites More sharing options...
Red Ticker Posted April 16, 2007 Share Posted April 16, 2007 Excellent! Noise restrictions are getting to be a real pain. We need all the help we can get! M Martin Red Ticker Link to comment Share on other sites More sharing options...
Simon.Rogers1 Posted April 16, 2007 Share Posted April 16, 2007 Yes Neil but you've got an SV! Link to comment Share on other sites More sharing options...
dave1968 Posted April 16, 2007 Share Posted April 16, 2007 hmm all a bit confusing...has anyone tested this fitted to an r3/4/5 in a standrad s3 chassis? does it fit? does it work? is it lots quieter? Link to comment Share on other sites More sharing options...
neil.cavanagh Posted April 16, 2007 Share Posted April 16, 2007 Simon, You are welcome to try fitting the airbox to your car at Llys-Fran (or whatever it is called). The box is pretty low profile, so I think it will fit into a whippet sized car. it is certainly way smaller than the Bernard Scouse airbox I compared it to. Link to comment Share on other sites More sharing options...
Jason Plato Posted April 16, 2007 Share Posted April 16, 2007 RJ has a whippet chassis - dunno if he has rollers tho I thought the last conclusion was that the box fitted OK on a std chassis with rollerbarrels but one of the catches broke during its numerous trials ? Link to comment Share on other sites More sharing options...
neil.cavanagh Posted April 16, 2007 Share Posted April 16, 2007 RJ has jenvey's I think.. and has fudged up this airbox so it sits on the end of his trumpets. Or that is what his reply to thread in Tech Talk seems to say. Dave, reading the old threads I think you are right. People seem to say the airbox fitted physically, but the example the was being used for testing cracked/fitted poorly. The one I received last week fitted great!! Powderpuff wants to try it on his whippet with rollerbarrels, so we'll be able to say for sure then if it fits a r4/500 SIII chassis as well as SV. Link to comment Share on other sites More sharing options...
Mark Durrant Posted April 16, 2007 Share Posted April 16, 2007 Neil I would be happy to test it on my R500 😬 Mark D Comp Sec Link to comment Share on other sites More sharing options...
rj Posted April 16, 2007 Share Posted April 16, 2007 Mark, If your backplate fits my box I'll happily send it over to you to test... (I have vandalised the backplate to make it fit my setup) My chassis is the race chassis if that's what Dave J means with "whipped". And I do have Jenveys and 50mm long 42mm ø trumpets. To fit the std injectors using the jenvey fuel rails I needed to move the position of the box away from the TB's, up the trumpets so to say. When I did so I had to offset the holes from the center of the backplate, but as the face of the trumpet is at level with the backplate I don't think it's an issue. /regin Link to comment Share on other sites More sharing options...
Simon.Rogers1 Posted April 16, 2007 Share Posted April 16, 2007 It did fit just! It did start to fall apart. And I believe it was power tested also with no significant loss of power. But also no significant reduction of sound either. Link to comment Share on other sites More sharing options...
rj Posted April 16, 2007 Share Posted April 16, 2007 It does reduce noise on my car; it did help a lot (2dB) when I fitted ugly self adhesive foam on the top of the box to reduce the vibration of the top panel. /r Link to comment Share on other sites More sharing options...
rj Posted April 16, 2007 Share Posted April 16, 2007 Oh... And it survived my off-day well where everything in the engine bay was mixed! Like this What I've noticed is that the backplate was in fact bent, but yet the box survived! Link to comment Share on other sites More sharing options...
Nifty Posted April 16, 2007 Share Posted April 16, 2007 Hmm, might have to consider one myself. What bits broke when being tested 🤔 Keep off the straight and narrow 😬 Link to comment Share on other sites More sharing options...
Jason Plato Posted April 17, 2007 Share Posted April 17, 2007 I recall one of the zeus fastener tabs broke ?. The airbox looked to be of reasonable quality when I first saw it at the motorshow a few years back. The noise testing that was done I gather was quite basic with a simple drive by test by frankyknuckles ?. Link to comment Share on other sites More sharing options...
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