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Thread: Managing exhaust noise limits - teased from Japfest thread

  1. #81
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    it wont be that loud, my apex single silencer system was 103db @ 4k rpm

  2. #82
    Guest Drifter's Avatar
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    How has everyone tested their dB's. Don't really want to ask the local plod

  3. #83
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    thats a good point, I really don't want to ask the local plod as they are the one who are giving me grief, was hoping that my local tuner and RR could do it but they don't

  4. #84
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    yeh i have

  5. #85
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    Quote Originally Posted by drifter
    How has everyone tested their dB's. Don't really want to ask the local plod
    Tested mine at Goodwood first as a benchmark and then used a Nokia mobile at the same distance and RPM and it was 1db lower on the Nokia so they're reasonably accurate. They don't test db's by sticking it up the exhaust, its a set distance and angle away from the end of the exhaust tip.

  6. #86
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    what phone does dB limits?????

  7. #87
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    1meter @ 45degrees

  8. #88
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    Quote Originally Posted by kkydd
    what phone does dB limits?????
    Dont know the number. It is the Nokia jobbie for builders, in a tough rubber case. It also has a torch and level

  9. #89
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    Quote Originally Posted by kkydd
    what phone does dB limits?????
    Nokia 5100

    http://www.mobile-phones-uk.org.uk/nokia-5100.htm

    Nokia 5140

    http://www.mobile-phones-uk.org.uk/nokia-5140.htm
    Last edited by Kev_L; 14-06-2005 at 07:55.

  10. #90
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    Quote Originally Posted by Kev_L
    Thats the one

  11. #91
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    Quote Originally Posted by Creasey
    ...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
    My mistake, apparently he got one the track with the silencer but without the bung -whereas before the bung was needed. It wasn't even the largest jetex silencer that I put in (no hammering of the floor pan needed ).

  12. #92
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    yes......

    was a very well made pipe..............

  13. #93
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    Lol. And apparently his sex life got better for the duration it was fitted, and people in the street stopped him to congratulate him on his choice... etc.

  14. #94
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    hahahhaaaa

    Quote Originally Posted by Creasey
    Lol. And apparently his sex life got better for the duration it was fitted, and people in the street stopped him to congratulate him on his choice... etc.
    It was bloody noisey before......

  15. #95
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    Well I have an Apexi ECV which I used for japfest at CCoombe. I closed it a bit to get tested (94db) and then opened it up on track.. job done

  16. #96
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    Quote Originally Posted by Bart
    It was bloody noisey before......

    im borrowing it again for the UJC track day to so im hoping that will still get me though as it was 100DB bang on the nose

  17. #97
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    OK have they got in for me? I just get the home page for all the Jetex links.

  18. #98
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    We have this problem in Sweden also. Usually there is a 95 dB limit on our tracks. I don't know how many cars were blackflaged on "JapMeet" this summer due to beeing to loud, but it was ALOT!
    Almost all aftermarket systems seem to be to loud. If not they have an ugly as tailpipe...
    I'm still on stock but I'll probably build my own to keep the noice down.

  19. #99
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    Quote Originally Posted by blobsta
    Anyone got any pics of these jetex boxes fitted
    I'll take some photo's of mine, I'm not very tolerant of excessive noise but the Jetex silencer mad quite a differance when it replaced the tiny mid-box of the Apex old style twin box system. I'll see if I can get some dB figures

    And I only added this one

  20. #100
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    Quote Originally Posted by SM
    I'll take some photo's of mine, I'm not very tolerant of excessive noise but the Jetex silencer mad quite a differance when it replaced the tiny mid-box of the Apex old style twin box system. I'll see if I can get some dB figures

    And I only added this one
    I have the same box, it made a huge difference. Took it out now because I wanted the power back

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