Bedford 87.5db with exhaust system ?

Discussion in 'Clio General Chat' started by TrackM3, Aug 14, 2019.

  1. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    Toyo sport manifold, decat & k-tec system

    Will this pass the drive by noise limit at Bedford GT if 87.5db
     

  2. Beany

    Beany Platinum Member

    Messages:
    2,244
    Location:
    Doncaster
    Car:
    RB 200 cup
    I have a feeling it’ll fail. Have you had it static tested?
     
  3. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    No, only thing we can try is a phone app.
     
  4. RSRowe

    RSRowe Paid Member

    Messages:
    276
    Car:
    Clio 197
    Absolutely no hope of passing with that system fully decatted.
     
  5. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    Previous owner has passed Bedford with it apparently so unsure now
     
  6. RSRowe

    RSRowe Paid Member

    Messages:
    276
    Car:
    Clio 197
    Surprising. I've a ktec with the cat in the manifold still, and it just scrapes through at Donington (92db drive by)
     
  7. Beany

    Beany Platinum Member

    Messages:
    2,244
    Location:
    Doncaster
    Car:
    RB 200 cup
    Yeah but passed by short shifting / knowing where the microphones are.

    Personally not worth the risk as they can be strict and throw you out
     
  8. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    I’m surprised too. Aware where the metres are but it’s no fun short shifting
     
  9. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    We ended up completely bunging one of the tail pipes from advice of custom exhaust makers. Makes all the boxes work harder resulting in keeping the noise down, but it's obviously very restrictive & hotter.

    Dropped the static by 5 db, we drove it hard all day and did get the noise board a few times as were getting close, peeked at 86.8 and limit is 87.5.

    Need to get a system made when we want to return back to Bedford or even Thruxton.

    Apparently as its a 2.5" system that then splits into 2 back boxes and still remains on being 2.5" it acts like an amplifier, needs to be dropped to 2" for the tail pipes.
     
    Beany likes this.
  10. Beany

    Beany Platinum Member

    Messages:
    2,244
    Location:
    Doncaster
    Car:
    RB 200 cup
    Personally I’d keep the exits at 2.5” and fit a mid silencer.

    By reducing the sizes it’ll build up more back pressure in the exhaust which will effect overall performance
     
  11. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    Has a pretty large mid silencer already.

    Next track we want to do is Cadwell Park so should be okay for that then we'll look into it.
     
  12. Beany

    Beany Platinum Member

    Messages:
    2,244
    Location:
    Doncaster
    Car:
    RB 200 cup
    That’s one noisy car, I’ve got a standard mani, decat, res scorpion and that’s loud but never had noise test issues.
     
  13. TrackM3

    TrackM3 Paid Member

    Messages:
    157
    Car:
    M2 & 197 CUP
    Video be coming soon on my build, also have one following it in my M2 and you clearly hear it
     
    Beany likes this.

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