BostonDMD

need to pass the 88dB sound limit of Lime Rock?

I know the race is unmuffled, but it would be nice to be able to do at least one event prior to it, especially since it is the closest track to me.......

Veloce Raptor

..

38D

This...


or maybe this

BostonDMD

I am going to order one of each....... just in case......

MUSSBERGER

Just stay close to Sean or Gary and point at them.

bsztanko

Come to the test and tune day two weeks prior. Unmuffled as well.

BostonDMD

Now you are talking...... when is that exactly?

I got to remember to get the car down to you guys soon, if I want to run in E at LRP.....

bsztanko

Sooner the better....I'll text you the date tomorrow.

white924s

I'm not sure how relevant it is for you with a 911, but for what it's worth, last fall, my 924S with a 4-1 headers, a Lindsey Racing exhaust, and Magnaflow muffler got black flagged pretty much instantly. Some guys were experimenting with various contraptions attached to their muffler tips to try and attenuate the noise, but I had only limited luck with that.

I've since replaced the entire exhaust system on my car, and I'm looking forward to driving at LR without constantly being afraid of the black flag

jittsl

I once was black flagged at Limerock driving my GT3 with it's STOCK exhaust. Street legal to drive down the main street but not legal on the racetrack! Locals are completely insane!!!

M758

I think my 944 spec would pass 88 dB. It has a stock intake and stock muffer. It is only missing the cat. I believe I did pass sound check at 86 dB, but my limit was 92 or 94 dB and I know I was well below that.

Sean F

this...

IPguy

try putting a "muffler" on the intake as well

the BMW S14 has significant intake "noise" when an unrestricted CF intake is used, damping the sound waves from the intake lowered to overall sound wave signature

my 2 cents, don't always look to the exhaust if the intake is very "open" or unrestricted (compared to stock)

Dan Jacobs

Paolo,
We have, I believe,working exhaust for all cars at Lime Rock From 2.0 through Cup cars
your's included All you have to do is ask

race911

What we found was necessary for some of the carburetted cars at Laguna when they first started sound testing.