Need to get my exhaust under 88db advice needed.

1. Aly Saxperience Addict Joined: Apr 2007 Sunderland Posts: 10341

   #1 6th May 2010, 16:47

   Basically I'm going on croft at the end of this month (29th)
   The noise limit is 88db. I have measured my car someone I know had a db metre, it come back as 108db from 1 metre (which is what Javelin track days test at)
   
   Now I need to source a standard back box but the question I want answering is, I have a Supersprint centre section with the centre box.
   
   Will having a standard back box on my Supersprint centreboxed centre seciton be the same as having it on a standard Saxo centre section
   
   Help Appreciated.
2. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #2 6th May 2010, 17:03

   what system are you using now, a supersprint straight though? i just changed the one with a middle box, and it brings the noise down alot!!
3. Ashleyp Saxperience Hardcore! Joined: Apr 2008 Bedford & Manchester Posts: 17504

   #3 6th May 2010, 17:07

   108's very loud
   
   did you measure it at full throttle?
   
   if so, i beleive most track places DON'T measure it at full throttle
4. Aly Saxperience Addict Joined: Apr 2007 Sunderland Posts: 10341

   #4 6th May 2010, 17:26

   Quote:

   Originally Posted by AndySAXO what system are you using now, a supersprint straight though? i just changed the one with a middle box, and it brings the noise down alot!!

   A silenced supersprint system with 2" supersprint back box.
   
   

   Quote:

   Originally Posted by Ashleyp 108's very loud did you measure it at full throttle? if so, i beleive most track places DON'T measure it at full throttle

   No.
   You measure it to 70% of your rev limit and the downrev also.
   
   Also you kind of answered your own question there.
   
   Would just like a straight answer tbh.
5. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #5 6th May 2010, 18:38

   not too sure mate, sure itd be less restrictive then stock... so it should in that case be louder??
6. Lewis Saxperience Forum Bum Joined: Oct 2009 Middlesbrough/Coventry Posts: 3808 Megane 225

   #6 6th May 2010, 18:41

   No it would be louder than a standard system. The greater bore means more volume of air flow. Although i would imaging a standard back box will greatly reduce the noise, try get a newer back box as it will do the job better.
7. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

   #7 6th May 2010, 18:57

   Does it still have the VTR dials? Whack a 1.1 backbox on and tell them your rev limit is 6200 RPM.
8. Richie2104VTR Saxperience Forum Bum Joined: Oct 2006 Newcastle Upon Tyne Posts: 2770 VTARRRR/S

   #8 6th May 2010, 19:07

   Put silencer in, standard backbox & slow rev to 4.5k should see you around that level.
9. Harv Saxperience Forum Bum Joined: Mar 2007 Mold Posts: 2936 EP3 Civic Type R

   #9 6th May 2010, 20:29

   Packable silencer? Something like http://www.demon-tweeks.co.uk/Motors...ncer/1884/5134. I know quite a few people use them to get the noise down, looks a bit weird having another backbox/silencer sticking another 30cm out the back but it works. Iirc bic used them to do trackdays in the 106.