Exhaust noise (volume wise) serious

1. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

   #1 12th September 2010, 20:58

   Ok here is the question :
   
   With trackdays apparently seeming to be tightening up on noise levels , just thought we could get a list some readings of what volume each set up makes.
   
   Normally done 1/2 meter from Tail pipe at 3/4 max revs
   
   Here is my set up
   
   induction kit : Raceland enclosed
   Manifold : Standard
   Exhaust : standard with decat
   Reading :82 dB read at croft, 77db read at elvington
   
   
   Any more people got any readings ? I am thinking of getting a magnex & a 4 branch anybody got any readings for this setup ?
2. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #2 12th September 2010, 21:00

   i got 85 dB at cadwell with a supersprint race back box and middle box, raceland mani with throttle bodies.
   
   was done 1/2 meter from the exhaust at 4.5k.

   1 user thanked this post: user_28362
3. user_36594 Established Member Joined: Aug 2009 Weston Super Mare Posts: 1298

   #3 12th September 2010, 21:07

   i got 86db at combe with 4 branch decat and magnex backbox with pipercross viper. also done at the usual 1/2 mtr at 4.5k

   1 user thanked this post: user_28362
4. user_36594 Established Member Joined: Aug 2009 Weston Super Mare Posts: 1298

   #4 12th September 2010, 21:11

   I know u have been debating over this for a while jon! wat u have to think is that most track day limits are around 95db restricted on strict tracks?
   Noise levels measured in decibels actually double for every 3db. So 86 Db is twice as loud as 83Db. not 172 like u wud assume it to be. So by fitting a performance exhaust system, it might sound a lot louder, but it really isnt!
5. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

   #5 12th September 2010, 21:25

   Quote:

   Originally Posted by scholesyy I know u have been debating over this for a while jon! wat u have to think is that most track day limits are around 95db restricted on strict tracks? Noise levels measured in decibels actually double for every 3db. So 86 Db is twice as loud as 83Db. not 172 like u wud assume it to be. So by fitting a performance exhaust system, it might sound a lot louder, but it really isnt!

   
   I am stuck at 88db at 3/4 revs if i want to use one of my local tracks, but looking at some other trackdays I can get a descent discount for having a quieter car.
   
   I have been debating whether to swap to an M3 for trackdays, but If I don't do that i need to increase the power of the saxo. But leaving the std manifold & exhaust sytem on may strangle it a bit.
   
   But at the minute where the sound meter is on the track means In the last 3rd of the track at croft, means I cannot run close to other cars throught that section, so then by the time I get to the main straight I am too far behind to get past them, so once again by the next lap I am up there arse again & then have to back off again.
   
   I can get away with being close to std noise making cars, but anything slightly noisier & i keep getting to to back off them or we trip the sound meter.
6. user_36594 Established Member Joined: Aug 2009 Weston Super Mare Posts: 1298

   #6 12th September 2010, 21:32

   seems a stupid way to measure it tbh. dont they measure it before u go on? surely by mesuring it like that ur gonna get noise from other cars anyway so it wont be accurate. there must be other cars on track that are running performance exhausts? tbh i dont think ive ever seen anyone on track using a standard one. i seen evos etc puttin out about 130db so i dunno how they get away with it
7. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

   #7 12th September 2010, 21:50

   Quote:

   Originally Posted by scholesyy seems a stupid way to measure it tbh. dont they measure it before u go on? surely by mesuring it like that ur gonna get noise from other cars anyway so it wont be accurate. there must be other cars on track that are running performance exhausts? tbh i dont think ive ever seen anyone on track using a standard one. i seen evos etc puttin out about 130db so i dunno how they get away with it

   Measure you before you go on & whilst on track if you get close to someone & buzz the noise meter you can get took off ?
   
   They have said that they are gonna put me in a different group next time as apart from a couple of big power 1.8t cars in our group , the saxo was just catching up with cars lap after lap
8. user_36594 Established Member Joined: Aug 2009 Weston Super Mare Posts: 1298

   #8 12th September 2010, 22:00

   i cant see the sense in measuring u whilst ur on track! its not suddenly gonna change!
9. user_37194 Established Member Joined: Sep 2009 rotherham Posts: 1832 Be scirocco, full on 03plate track spec Saxo

   #9 12th September 2010, 22:02

   ths reali is somethings i need to look into in a few months time as am alittle worried about myn, cams, itbs, 4-2-1 straight though to 4inch exhaust, what you guys reckon tht be?
10. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

    #10 12th September 2010, 22:20

    Quote:

    Originally Posted by mark1311 ths reali is somethings i need to look into in a few months time as am alittle worried about myn, cams, itbs, 4-2-1 straight though to 4inch exhaust, what you guys reckon tht be?

    which track you planning on going to ?
    
    I might even buy a cheap sound meter tbh, I have seen a couple of cars turned away with no refunds before ?
    
    As for your noise I have no idea, some one will be along in a minute who will know i guess
11. user_37194 Established Member Joined: Sep 2009 rotherham Posts: 1832 Be scirocco, full on 03plate track spec Saxo

    #11 12th September 2010, 23:01

    most uk tracks mate, plan to go round most tracks with it, i think my ifone has one but iduno how good they are lol
12. user_27192 Saxperience Addict Joined: Sep 2008 Suffolk Posts: 11590 ITB'd Saxo VTS & Mazda 6 MPS

    #12 13th September 2010, 00:19

    induction kit : bmc
    Manifold : supersprint 421
    Exhaust : supersprint/kam racing 2' b'box
    Reading : 85db on tickover, 103db at 5250rpm
13. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

    #13 14th September 2010, 10:52

    Quote:

    Originally Posted by Chr15 induction kit : bmc Manifold : supersprint 421 Exhaust : supersprint/kam racing 2' b'box Reading : 85db on tickover, 103db at 5250rpm

    103 dB WTF ? those kam backboxes must make some noise
14. titchster Saxperience Forum Bum Joined: Jan 2008 Down't road from Sheffield Posts: 4641 Was:16v 106 XS ..... Now: Import 1.8 MX5

    #14 14th September 2010, 11:04

    Induction: Raceland
    Manifold: Standard
    Exhaust: Pugsport 3"
    Reading: 86db at 4500 (I think).
    
    
    You need to head South to Cadwell, no trackside sound checks.
15. Mieran Saxperience Post Whore Joined: Jul 2007 Newcastle Posts: 6719

    #15 14th September 2010, 11:16

    What diameter pipework are you looking to get?
    
    Even if its 2.25", a 3 box system should be quite(ish).
    
    My car is going to have a 3" system and 1 silencer, so knockhill is my only option lol
16. user_27192 Saxperience Addict Joined: Sep 2008 Suffolk Posts: 11590 ITB'd Saxo VTS & Mazda 6 MPS

    #16 14th September 2010, 12:29

    Quote:

    Originally Posted by jonathon5 103 dB WTF ? those kam backboxes must make some noise

    yes loads and i loved it, especially when it popped at 3k rpm. even with the cat and silencer back on its still not that quiet
17. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

    #17 14th September 2010, 12:45

    Yer but a middle box really brings the noise down chris, I have the same system bar I have a middle box and I am only 85.
18. Steve Saxperience Hardcore! Joined: Mar 2005 Newcastle Upon Tyne Posts: 19910 CW Honda Integra DC5

    #18 20th September 2010, 16:59

    Saxo VTS
    intake: BMC CDA
    Exhaust: Std Manifold + Cat, None Silenced Supersprint Centre Section, Superspint 2inch Backbox
    DB: 92 at 3/4 rev range measured at Croft.
    
    Honda Civic EK9
    intake: STD
    Exhaust: STD
    DB: 87.1 at 3/4 rev range measured at Croft + Cadwell
19. Steve Saxperience Hardcore! Joined: Mar 2005 Newcastle Upon Tyne Posts: 19910 CW Honda Integra DC5

    #19 20th September 2010, 17:00

    Quote:

    Originally Posted by Mieran What diameter pipework are you looking to get? Even if its 2.25", a 3 box system should be quite(ish). My car is going to have a 3" system and 1 silencer, so knockhill is my only option lol

    limits still 105db at knockhill.
    Yet i have never seen anyone measured on a hot hatch / speed sunday.
    And you get some loud cars! and i mean loud
20. Mieran Saxperience Post Whore Joined: Jul 2007 Newcastle Posts: 6719

    #20 20th September 2010, 17:38

    They say 105 but like you said they never measure it
21. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

    #21 20th September 2010, 17:45

    Quote:

    Originally Posted by Mieran My car is going to have a 3" system and 1 silencer, so knockhill is my only option lol

    Don't think Teesside Autodrome measure noise levels either (... or at least they didn't when I was there).
22. Steve Saxperience Hardcore! Joined: Mar 2005 Newcastle Upon Tyne Posts: 19910 CW Honda Integra DC5

    #22 20th September 2010, 17:50

    Quote:

    Originally Posted by LeeumH Don't think Teesside Autodrome measure noise levels either (... or at least they didn't when I was there).

    didn't both times i have been.
23. user_36594 Established Member Joined: Aug 2009 Weston Super Mare Posts: 1298

    #23 20th September 2010, 18:41

    Quote:

    Originally Posted by AndySAXO Yer but a middle box really brings the noise down chris, I have the same system bar I have a middle box and I am only 85.

    +1 u can actually notice the difference considerably