Track car exhaust replacement

1. Lawson9 Newbie Joined: Dec 2012 Posts: 16

   #1 7th July 2014, 10:58

   I'm in need of a new exhaust system from de-cat pipe backwards for my track VTS.
   The current system is scorpion made with a standard CAT. However lately the noise has been creeping up above 88dbA so on my last track day at croft I had to use an exhaust bung. I suspect the back box and/or Cat are on there way out.
   
   Just looking for some advice on an exhaust system to use that will be below the 88dbA limit, maybe a system that someone has had experience of? I will be removing the cat and fitting a de-cat pipe.
   
   Cheers
2. andy94 L-plater Joined: Aug 2012 Newcastle Posts: 37 Furio/vts

   #2 7th July 2014, 17:30

   Magnex is good mate, got a raceland 4-2-1, de-cat, Magnex center silencer and back box on my vts, it sounds aswome but its not that loud to make your ears bleed !
3. user_24390 Saxperience Post Whore Joined: Jun 2008 North Wales Posts: 5576 Fabia VRS PD130/ VTR Mk2

   #3 8th July 2014, 10:28

   As above I also have a magnex backbox on the VTR. I have a 4-2-1 and a Supersprint center pipe, it was about 75dB at Oulton Park.
   On the downside the magnex backboxes are quite heavy.
4. chompy Established Member Joined: Jan 2008 Scotland Posts: 1764 Because racecar

   #4 8th July 2014, 10:37

   pugsport/saxsport ?
5. D4MJT Saxperience Forum Bum Joined: Mar 2009 Morpeth Posts: 2539 BMW 116d Regional Toner Sales Edition

   #5 8th July 2014, 10:46

   To completely disagree with the above, MuZiZZle previously ran a centre silenced Magnex system with a decat and Piper Manifold, and we were black flagged at FCS for 105db on drive by.
   
   He has a SaxSport on now, which is utterly bizarre, despite being louder to the ear, it literally flies through sound tests. We've tested it with a DB meter and the sound level drops off as you rev higher, it flows very well.
6. AdamH Saxperience Forum Bum Joined: Oct 2004 South Posts: 3638

   #6 8th July 2014, 12:57

   Never had any issues with the magnex as they are known to be the quietest exhaust.
   
   I am not sure why you were black flagged, probably many variables but I have never had any issues at brands hatch, Silverstone, rockingham, cadwell, llandow, Oldham, croft, Bedford, combe, goodwood or oulton park etc
7. D4MJT Saxperience Forum Bum Joined: Mar 2009 Morpeth Posts: 2539 BMW 116d Regional Toner Sales Edition

   #7 8th July 2014, 13:10

   were you decat?
8. AdamH Saxperience Forum Bum Joined: Oct 2004 South Posts: 3638

   #8 8th July 2014, 13:16

   I am indeed. but a standard manifold mated to the decat > mid box > rear box
   
   was muz on bodies or anything?
9. D4MJT Saxperience Forum Bum Joined: Mar 2009 Morpeth Posts: 2539 BMW 116d Regional Toner Sales Edition

   #9 8th July 2014, 13:20

   Quote:

   Originally Posted by AdamH I am indeed. but a standard manifold mated to the decat > mid box > rear box was muz on bodies or anything?

   How odd, nah not at all, he's cammed but unmapped, Piper manifold - decat pipe - centre silencer - backbox with 3" exit.
   
   We scraped through the static by about 2db, and got black flagged 2nd lap. Had to short shift the rest of the day.
10. AdamH Saxperience Forum Bum Joined: Oct 2004 South Posts: 3638

    #10 8th July 2014, 13:33

    the tester was obviously in a bad mood that day
11. Gareth_R Established Member Joined: Mar 2010 Basildon, Essex Posts: 1042 Citroen AX VTS

    #11 8th July 2014, 21:23

    Had a 421 then a 2 inch pipe into a back box with twin 3inch exits. Had no track issues with that car lol
12. Lawson9 Newbie Joined: Dec 2012 Posts: 16

    #12 9th July 2014, 16:11

    I've been looking at the saxsport systems, relatively cheap and seem to be well made also.
    
    The system I've been looking at is the decat system with centre silencer and 2" race backbox but again unsure on the systems noise. I just don't want the hassle of having to buy another silencer to weld in meaning more restriction.
    
    My car is running a 4-2-1 manifold (not sure on make), cammed and a 3" cold air feed through the headlight.
    
    Cheers
13. user_4681 Saxperience Post Whore Joined: Dec 2004 Grimsby United Kingdom (England) Posts: 5489 SUPERCHARGED saxo vts

    #13 12th July 2014, 12:57

    btb if you can find one, 3 boxes, built to last, good for boost if you ever do, holds its value and most importantly pretty quiet!
14. MuZiZZle Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5

    #14 12th July 2014, 13:14

    Quote:

    Originally Posted by Lawson9 I've been looking at the saxsport systems, relatively cheap and seem to be well made also. The system I've been looking at is the decat system with centre silencer and 2" race backbox but again unsure on the systems noise. I just don't want the hassle of having to buy another silencer to weld in meaning more restriction. My car is running a 4-2-1 manifold (not sure on make), cammed and a 3" cold air feed through the headlight. Cheers

    I'd do you a video but it probably wouldn't pick it up correctly, it's bizarre as D4 says, we used a shit hot pro DB meter too, it idles loud then once it gets load the noise just drops, much like fucking Brets mam
15. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #15 12th July 2014, 14:11

    The Saxsport is loud. Depending on the circuit it certainly will have issues with noise control. We had loads of enquiries on how to sort these systems (as well as single box Supersprints) when we were at Donington FCS a few years back.
    
    You will need a twin box system for the VTS if you want to do a large variety of circuits in the uk. The magnex full system should be quiet but its not the best flowing.
16. Dany4494 Established Member Joined: May 2012 West Yorkshire Posts: 1806 Civic EP2

    #16 12th July 2014, 14:21

    Cherry bomb is needed.
17. MuZiZZle Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5

    #17 12th July 2014, 14:32

    Quote:

    Originally Posted by KamRacing The Saxsport is loud. Depending on the circuit it certainly will have issues with noise control. We had loads of enquiries on how to sort these systems (as well as single box Supersprints) when we were at Donington FCS a few years back. You will need a twin box system for the VTS if you want to do a large variety of circuits in the uk. The magnex full system should be quiet but its not the best flowing.

    WTF is going on with mine then?
18. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #18 12th July 2014, 14:44

    your wadding could have gone. We had a car here that burnt all its wadding into a small hard lump the size of a 50p. Its now an ornament on one of our shelves lol. I dont know what grade of wadding is fitted to a magnex but it may not cope with high exhaust temperatures or a rich fuel mixture if its igniting in the exhaust system.
19. MuZiZZle Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5

    #19 12th July 2014, 15:43

    Quote:

    Originally Posted by KamRacing your wadding could have gone. We had a car here that burnt all its wadding into a small hard lump the size of a 50p. Its now an ornament on one of our shelves lol. I dont know what grade of wadding is fitted to a magnex but it may not cope with high exhaust temperatures or a rich fuel mixture if its igniting in the exhaust system.

    I mean my saxsport being quiet
20. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #20 13th July 2014, 15:26

    What's it registering on the db meter and what engine mods you have?
21. D4MJT Saxperience Forum Bum Joined: Mar 2009 Morpeth Posts: 2539 BMW 116d Regional Toner Sales Edition

    #21 13th July 2014, 15:31

    Quote:

    Originally Posted by KamRacing What's it registering on the db meter and what engine mods you have?

    Piper manifold, piper cams, decat 2" saxsport, CDA, unmapped at 141bhp
    
    It makes 89 at idle dropping to 80ish at 4,500rpm
    
    It's random.
    
    Next time it's MOT'd I'll get a vid with the db meter, it's bizarre. Totally drops off under load. We were black flagged with the magnex and we've never had a problem with the saxsport yet, knockhill, Caldwell, castle
    Combe etc. It's definitely not loud.
    
    Also I've had the saxsport from new, it did 5k on my car and then it's maybe done 2k max on chris' since
22. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #22 14th July 2014, 13:42

    I wonder if they have a more road focused backbox then for the saxsport vs the pugsport. Different tailpipe sizes make a difference to harmonics, even things like tailpipe angle can affect if the trackside meters get tripped.
    
    Kev
23. Lawson9 Newbie Joined: Dec 2012 Posts: 16

    #23 17th July 2014, 20:22

    The road saxsport backbox is a 3 inch whereas the race spec Saxsport I'm thinking of buying is a 2 inch rolled.
    Still stuck on this!
    I've got 2 weeks to decide and buy it, while the cars away getting the roll cage fitted. Decisions decisions!