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Thread: Managing exhaust noise limits - teased from Japfest thread

  1. #41
    committed. Jezz_S13's Avatar
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    115db LOL. Woops.

  2. #42
    Member John Bennett's Avatar
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    As a nerdy aside, I was reading the Skyline service manual, and on one model there seems to be a system on the twin-exit exhaust to electrically shut one of the exits? Akyone know if this was for noise issues, and did it ever work well?

  3. #43
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    Quote Originally Posted by John Bennett

    As a nerdy aside, I was reading the Skyline service manual, and on one model there seems to be a system on the twin-exit exhaust to electrically shut one of the exits? Akyone know if this was for noise issues, and did it ever work well?
    Yeah, it was fitted to some of the R33 GTS-T's but I've never seen it on a car over here. Some Mitsubish GTO's also have it.

  4. #44
    Guest Parker's Avatar
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    And Chris was telling me how it was quieter after the RB lump went in

  5. #45
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    Quote Originally Posted by The Pilot
    And Chris was telling me how it was quieter after the RB lump went in
    Thats the thing, I'm sure it does sound a fair bit quieter than it did with the CA with the same NUR Spec R with the bung out when you're driving around normally (and Chris is nodding as I type this). I've never fitted the bung in it since the RB went in and with the CA I used to drive with the bung in most of the time because of the resonance and noise.

    I guess at 5,000 rpm you tend to leave a lot of the sound in your wake so you don't appreciate how loud it really is.

  6. #46
    Flamethrower Jez's Avatar
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    Quote Originally Posted by mambastu
    Jez, any idea what db's your car was before and after you fitted the additional silencer in it ?
    No, fraid not - I've only ever run this engine with the big silencer in.

    Sounds like you're never going to get your car on track Bit of a shame and waste...

  7. #47
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    Quote Originally Posted by Jez
    Sounds like you're never going to get your car on track Bit of a shame and waste...
    Its hardly a waste as it was never intended to be a dedicated track car. Its my comfy (compared to my bike) daily used road car.

    Just chatting to Chris about it and we've got a few options to explore before GT-Battle.

  8. #48
    Flamethrower Jez's Avatar
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    Just winding you up mate
    Comfy at 115db?

  9. #49
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    Quote Originally Posted by Jez
    Comfy at 115db?
    Well....drier than the bike then

  10. #50
    Flamethrower Jez's Avatar
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  11. #51
    S13 + 2bar = 475@wheels bren's Avatar
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    We have a selection of silencers here now to try out

  12. #52
    Guest Creasey's Avatar
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    Quote Originally Posted by yeager
    Why did you choose this make? Is the construction good? Did you slot the silencer into the same space an S14 decat pipe would go? If so, which unit did you get?
    I make s14/a decat silencers using Jetex units -there was one fitted to Slipstream Ian's car at Japfest. Think he still used the Nur bung as well to be on the safe side though, so not a very useful experiment! The difference is apparent on the road though.

    I use the largest oval section that will fit. It's no lower than any other part of the Nur, but of course in the centre of the car so more of a problem for speed bumps.

    Jetex have a good reputation but they aren't cheap if you want stainless. Get what you pay for though

  13. #53
    muppet Dr Bob's Avatar
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    Quote Originally Posted by bren
    We have a selection of silencers here now to try out
    how did you get through the croft noise restrictions at the weekend?
    power-crazed Head-Mod

  14. #54
    S13 + 2bar = 475@wheels bren's Avatar
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    We didnt get kicked off, although Kev said we were getting comments from spectators about the car being loud.

  15. #55
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    I don't see the issue its not like you're all in the middle of a housing estate is it!!

    Can't imagine F1 races being halted by some little t**t running along behind the cars with a db meter!!!!!

  16. #56
    muppet Dr Bob's Avatar
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    Quote Originally Posted by bren
    We didnt get kicked off, although Kev said we were getting comments from spectators about the car being loud.
    did you play with silencers/bungs/the whole system . or did they just not test

    Quote Originally Posted by S13 girly
    I don't see the issue its not like you're all in the middle of a housing estate is it!!

    Can't imagine F1 races being halted by some little t**t running along behind the cars with a db meter!!!!!
    not really the point is it. if a racing circuit wants to keep its licence then they have to comply with local regs. and like it or not, wherever you put a circuit, there are going to be local residents who don't want noise.
    Last edited by Dr Bob; 31-05-2005 at 11:01. Reason: a bit confrontational
    power-crazed Head-Mod

  17. #57
    S13 + 2bar = 475@wheels bren's Avatar
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    They just didnt test

  18. #58
    muppet Dr Bob's Avatar
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    Quote Originally Posted by bren
    They just didnt test
    power-crazed Head-Mod

  19. #59
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    I fitted a silencer from Jetex for this weekend at Wild Trax. My Nur Spec system without it was 108db without the bung and 104 with, fitting this new box in the same place as the decat pipe gave me 97ish without the bung and a whopping 86ish with it!! RESULT

    Not that much performance loss with the in and the bung out either...

  20. #60
    Flamethrower Jez's Avatar
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    Same setup as me - works well dunnit

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