Matt230 Posted January 3, 2019 Share Posted January 3, 2019 I appreciate this may be done to death, however I am looking for some opinions on drive by noise restrictions on track with my Caterham, particularly induction based. It has a dustbin sized silencer that is repackable and very quiet, significantly quieter than my previous Caterham so no concerns on exhaust based noise. However I have a K series with Roller Barrells, Pipercross filter but no cut out on the bonnet. Its loud on WOT and I am concerned that this could be close to tripping the drive by limits? Likely tracks I will be using are Snetterton, (mostly), Brands (occasionally) and Cadwell (hopefully). Will this be an issue for the drive by? I have seen airboxes such as this: http://www.emeraldm3d.com/auto-teknix-airbox-caterham-7-r500-kit.html which obviously needs a filter too. Is this a good solution if there is a potential issue? I’d rather not spend the money but that’s preferable than taking a day off work and being kicked off track for noisy induction. Any other suggestions please general or other airboxes? I’ve just had the car tuned on a rolling road, if this airbox is fitted does it need retuning with the airbox due to change in airflow? I’d rather run on road without the box for the extra barkMany thanksMatt Link to comment Share on other sites More sharing options...
Area Representative Geoff Brown Posted January 3, 2019 Area Representative Share Posted January 3, 2019 I had a 1.6K on Jenveys, no bonnet cut out, with a bespoke exhaust pushing out 155bhp & got fingered at Donington on the drive by.Castle Combe rejected the car static @ 110dba so I repacked it & got away with 99dba. The next drive by at Donington was fine....ish! The Jenveys were covered by oily hands bespoke GRP intake plenum with a Pipercross filter on the end so the intake noise was reduced but the culprit was the exhaust. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted January 3, 2019 Leadership Team Share Posted January 3, 2019 Hi Matt, my SLR in a previous incarnation ran Jenveys with sizeable carbon trumpets and at full tilt was bl**dy noisy.I now have roller barrels but with the full CC R500 carbon airbox setup and this substantially reduces the intake noise - definitely an airbox is the way to go. Unfortunately the CC airbox kits are as rare as rocking horse poo and therefore command good money, the same kit can be put together from Reverie parts but I suspect it'll be upwards of £650 to do it ... the CC kit was originally £1000. They do come up second hand from time to time so it's worth putting a wanted out.The Auto Technix airbox you've linked to is certainly a viable solution, it's not quite as tidy an install as the original R500 version but it's a fraction of the price and it's available. If you're trying to keep costs down even further there's plenty of space between the backplate and the bonnet so it wouldn't be too hard to knock up something bespoke.Stu. Link to comment Share on other sites More sharing options...
Adrian M Posted January 3, 2019 Share Posted January 3, 2019 I run an R400 with ~225BHP. I have a Raceco and a rear silencer. My exhaust static is now ridiculously low. The drive by is also pretty good. However induction drive by is still an issue and something I need to address. I starting to look into air boxes too. In addition to the options already mentioned there is a Pipercross box designed to fit the 600 back plate:https://www.burtonpower.com/air-box-75mm-lh-no-intake-pipe-filter-c6275lh.htmlThe other option is knowing where the meters are and adjusting your driving by getting as far away as possible and short shifting. At the end of last year I got a couple of warnings at Bedford. It was only one of the 4 meters I was bothering, so by addressing my driving they were happy to let me continue. I can run all day at Snetterton and Cadwell with no drive by issues. I can tell you what Brands in like after September. Perviously I was fine there with no rear box and only ~200BHP. Link to comment Share on other sites More sharing options...
rj Posted January 5, 2019 Share Posted January 5, 2019 I'm not sure the Autoteknix airbox will fit under the bonnet with Titan roller barrel TBs. Link to comment Share on other sites More sharing options...
Matt230 Posted January 8, 2019 Author Share Posted January 8, 2019 Thank you for the replies.Initially i still have the question of will the roller barrels trip the drive by at Snetterton? the car is basically an R400 k series but with a big silencer so only induction noise would be the issue.If likely, i will invest in an airbox, looks like the Caterham one is hard to source, the Pipercross one looks like the quickest change over if required as fit on the same backplate. I have read some concerns about this airbox strangling power? Does anyone have any experience of this airbox? Matt Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted January 8, 2019 Leadership Team Share Posted January 8, 2019 I bought a Pipercross box s/h but then subsequently sold it on ... they're not very big and it was coming apart along the join of the two halves, not a particularly good quality product. Also being a universal fitment it doesn't make the most of the space you have available. By comparison the CC R500 kit is massive, very well made and fits nicely into the space. It's expensive though.Stu. Link to comment Share on other sites More sharing options...
Adrian M Posted January 9, 2019 Share Posted January 9, 2019 You should be fine on the drive by at Snetterton. I had no problems with my R400k on rollers, even with ~225BHP. Which is significantly louder (on induction) than when the engine produced ~200BHP. Link to comment Share on other sites More sharing options...
Tony Whitley Posted January 9, 2019 Share Posted January 9, 2019 I have had no problems with intake noise anywhere and my RBs stick out of the bonnet Link to comment Share on other sites More sharing options...
Area Representative Nick Bassett Posted January 9, 2019 Area Representative Share Posted January 9, 2019 Are RBTBs much noisier than other TBs?I have an SLR with the older KV6 TBs fitted with a foam air filter - the exhaust is a full Powerspeed system. I too was worried about noise and had it tested last year at Abingdon - static at 4500rpm it was only 91dB. I was so surprised a that low figure that I asked to do the test again and saw the same result!Now dynamically I'm sure it would be a different story as it sounds like an AK47 on over-run, but they only conduct static testing at Abingdon! Link to comment Share on other sites More sharing options...
Tony Whitley Posted January 9, 2019 Share Posted January 9, 2019 I would think if anything RBs would be quieter at full chat because the airflow is cleaner. I'm not an acoustic engineer so I don't know if having a butterfly in the flow would make a noise. Link to comment Share on other sites More sharing options...
nutty7 Posted January 9, 2019 Share Posted January 9, 2019 Car is looking good Tony, new paint job?Paul #6 Link to comment Share on other sites More sharing options...
Tony Whitley Posted January 9, 2019 Share Posted January 9, 2019 No, still the original paint. Don’t believe those people who say the camera never lies! Link to comment Share on other sites More sharing options...
Matt230 Posted May 10, 2019 Author Share Posted May 10, 2019 Thought i would give an update on this as might be of interest.I finally purchased a Reverie Carbon airbox, had it fitted and then re rolling road to chexk that the A/F tune was ok still since fitting the box. It was slight re-tuned to ensure the air fuel ratio was still on the safe side and i was impressed to see that it only lost 3 bhp with the Reverie box fitted.(its only a couple of months since the last tune on the same rollers)Attended my first day at Snetterton 300 yesterday and had no issues with either the static (91dB) or drive by noise restrictions. Matt Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 10, 2019 Leadership Team Share Posted May 10, 2019 Great result, even at the relatively high cost of using the Reverie box that’s money well spent.Stu. Link to comment Share on other sites More sharing options...
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