Exhaust system for race only use
07-25-2011, 04:49 PM
#22
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Just getting a pipe out behind the car makes a big difference in the in-car noise levels. I considered using earplugs when the EWG was dumped under the front subframe, but after recirculating I haven't really seen the need.
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07-25-2011, 04:54 PM
#23
im actually in the middle of planning my exhaust system right now. I plan on doing 3" all the way back with a burns muffler
http://www.burnsstainless.com/ultra-lightmufflers.aspx
if any of you get grassroots motorsports magazine, there was a great exhaust comparison in the December 2010 issue
http://www.burnsstainless.com/ultra-lightmufflers.aspx
if any of you get grassroots motorsports magazine, there was a great exhaust comparison in the December 2010 issue
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07-25-2011, 04:56 PM
#24
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im actually in the middle of planning my exhaust system right now. I plan on doing 3" all the way back with a burns muffler
http://www.burnsstainless.com/ultra-lightmufflers.aspx
if any of you get grassroots motorsports magazine, there was a great exhaust comparison in the December 2010 issue
http://www.burnsstainless.com/ultra-lightmufflers.aspx
if any of you get grassroots motorsports magazine, there was a great exhaust comparison in the December 2010 issue
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07-25-2011, 07:58 PM
#29
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The best way is to turn the exhaust away from the sound meter. Usually worth about 1dB at Laguna Seca IIRC. For example, at Laguna the sound station is on the right hand side of the exit of turn 5 so you have your exhaust pointed toward the drivers side (and some people do drivers side but angled upward so it doesn't bounce off the wall and go back to the sound station).
Crazy Porsche example I just found via google:
Crazy Porsche example I just found via google:
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07-26-2011, 07:24 AM
#33
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I do now. Wish I did in the past. I have lost hearing and have tinnitus in my right ear because of all the track loudness. I am happy to extoll the virtues of hearing/ear protection because tinnitus sucks. A lot.
Edit: If you're wearing plugs now and sound is getting through, you need better ones. I use the plastic-y swimming ones, the look sort of like this:
The expanding foam ones supposedly are almost as good for the amount of noise reduction they provide, but they have never worked as well for me and are harder for me to get in my ears. This all is also why I want the car as quiet as possible going forward, even at the expense of some power.
Edit: If you're wearing plugs now and sound is getting through, you need better ones. I use the plastic-y swimming ones, the look sort of like this:
The expanding foam ones supposedly are almost as good for the amount of noise reduction they provide, but they have never worked as well for me and are harder for me to get in my ears. This all is also why I want the car as quiet as possible going forward, even at the expense of some power.
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07-26-2011, 11:39 AM
#35
the turbo quiets down the exhaust to the point that its not necessary on most cars. i run a 3" i.d. dynomax race muffler. straight thru design barely bigger o.d. than i.d. not sure how much it actually does, but it's not absurd when i drive on the street or to the track. i have sensitive ears and wind noise bothers me more on a long highway drive than anything. on track with my helmet on i'm good to go. if you guys need protection with a helmet on your cars must be crazy loud. one thing though, do you guys run sa rated helmets? do they allow more noise than a motorcycle helmet? maybe that's part of it.
only track around here with a db limit is H2R.(afaik) i think it's around 100db @ 30ft. and i haven't had a problem.
only track around here with a db limit is H2R.(afaik) i think it's around 100db @ 30ft. and i haven't had a problem.
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