Jump to content


Photo

Noise?


  • Please log in to reply
11 replies to this topic

#1 RallyRed

RallyRed

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 7,804 posts
  • Name:Col
  • Location:NSW
  • Car:LC GTR etc
  • Joined: 02-October 11

Posted 21 May 2021 - 08:28 PM

Got pinged the other day by the Noise meter at a track day.
96 limit, I went 97.1.
I understand it's a logarithmic scale, so 1.7 over,is more than it seems.
2 x shotgun style pipes out the side.
Never been pinged before, so assume cold/ dense air is the issue?
I dont want to change the exhaust/ muffler , for the rare issue day.

Looking to just fit 2 x 90 degree removable 90 degree down elbows, to only fit if/ when reqd.

Question - anyone had real world experience with the attenuation that pointing pipes at the ground will achieve?
Thanks

#2 rodomo

rodomo

    To advertise here, call 13TORANA

  • Members
  • PipPipPipPipPipPipPip
  • 17,997 posts
  • Name:R - O - B Dammit!
  • Location:Way out west of Melbourne Awstraylya
  • Joined: 10-December 05

Posted 21 May 2021 - 10:44 PM

Hoon



#3 RallyRed

RallyRed

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 7,804 posts
  • Name:Col
  • Location:NSW
  • Car:LC GTR etc
  • Joined: 02-October 11

Posted 22 May 2021 - 06:16 AM

Hoon

Thank you, I try. :D



#4 Shiney005

Shiney005

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 8,993 posts
  • Name:Laurie
  • Location:Dubya Hay
  • Car:Toyota Mirai
  • Joined: 19-January 12
Garage View Garage

Posted 22 May 2021 - 08:08 AM

No real world experience, but it would have to work, especially with the higher pitched noises. It is the reason that tweeters have to be pointed at your head, while a subwoofer can hide behind the lounge. Did the officials pull you off the track for the day?



#5 RallyRed

RallyRed

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 7,804 posts
  • Name:Col
  • Location:NSW
  • Car:LC GTR etc
  • Joined: 02-October 11

Posted 22 May 2021 - 04:02 PM

Attached File  rps20210522_155947.jpg   492.14K   8 downloads

 

Black flagged by 2 Laurie.. the 3rd one would have seen us on the trailer.

Some chicken wire, chopped up drink cans, coupla hose clamps and all good as a temporary fix ( very temporary)

I have since also spoken to my exhaust guy who has done plenty of circuit cars, reckons the 90 degree down is a winner.  See how we go. 

Thanks

 



#6 arrimar

arrimar

    "Have you still got that Torana!"

  • Members
  • PipPipPipPipPipPip
  • 3,113 posts
  • Location:brisbane
  • Car:Salamanca L34, Absinth LH SLR/5000, Caribean Blue LH 5.0, C250 Merc,
  • Joined: 13-January 06

Posted 22 May 2021 - 04:41 PM

Are the noise meters on the inside or outside of the track? Fit a lefthand set of pipes or a righthand set depending which track.

#7 RallyRed

RallyRed

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 7,804 posts
  • Name:Col
  • Location:NSW
  • Car:LC GTR etc
  • Joined: 02-October 11

Posted 22 May 2021 - 05:15 PM

Yeah, not a bad idea. The 2 tracks we run at typically, are CW & CCW, so would require swaps each time. Will put it as option 2.
Ta.

#8 UCSLE

UCSLE

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 702 posts
  • Name:troy
  • Location:perth
  • Car:Goggomobil
  • Joined: 23-June 09

Posted 22 May 2021 - 09:21 PM

put a plate in the exhaust flange with a smaller diameter hole or lots of holes drilled , works for going over the pits 



#9 Ice

Ice

    Cool

  • Members
  • PipPipPipPipPipPipPip
  • 15,102 posts
  • Name:Gene
  • Location:Galaxy's away from Ipswich
  • Car:77 HZ Sandman Van
  • Joined: 03-January 07

Posted 22 May 2021 - 09:45 PM

You need some old school 18 inch hot dogs  :lol:



#10 ozyozyozy

ozyozyozy

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 944 posts
  • Location:perth
  • Joined: 13-February 08

Posted 23 May 2021 - 09:11 PM

Have done that before and had friends done same thing.
We fitted a turn downs on our exhausts to help with that. Cars were still noisey but didnt ping the meter.
How much less db it affects it i cant answer.

#11 RallyRed

RallyRed

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 7,804 posts
  • Name:Col
  • Location:NSW
  • Car:LC GTR etc
  • Joined: 02-October 11

Posted 24 May 2021 - 08:48 AM

Thanks gents.



#12 Zook

Zook

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 1,536 posts
  • Joined: 02-February 06

Posted 25 May 2021 - 08:15 PM

Is that slow old prick in the black and white HSV VL (I think it is) still getting around. Was it Vodaphone?




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users