Lime Rock Noise Restrictions

[Axxe]

Hey guys, we are racing at Lime Rock next month and are wondering what you all are doing to be compliant with the noise rules. We are running a bone stock M52 with an exhaust that goes dual back to the center support bearing before merging and going into a generic high flow muffler. Is this going to be quiet enough? What works on a 24v? Our car is hardly loud but it isn't silent either, wondering if we should stick a glasspack or something ahead of the muffler.

[JRKOUPE]

how would we know if youll pass w/o knowing your db?..

sounds like youll be fine..it aint a very aggressive set
up

I am there over 10x /yr..w/ a 2.5 inch set up...single....hi flow everything...24v

alot of loud ish cars pass there..

bring stuff just in case.....

coke can..coffee can...muffler...etc

[Axxe]

how would we know if youll pass w/o knowing your db?..

sounds like youll be fine..it aint a very aggressive set
up

I am there over 10x /yr..w/ a 2.5 inch set up...single....hi flow everything...24v

alot of loud ish cars pass there..

bring stuff just in case.....

coke can..coffee can...muffler...etc

If I knew my db, wouldn't have to ask :P

Just checking to see what other have ran that have been compliant. All we have is a single 2.5" high flow muffler, you mention high flow everything....what does that include? I have a feeling we are louder than that.

[z31maniac]

Bring an extra muffler and welder, cut and fix exhaust if you don't pass in practice?

[Axxe]

Bring an extra muffler and welder, cut and fix exhaust if you don't pass in practice?

No practice. First time we would know if we are over noise restrictions is a black flag. 4hrs Thursday, 8hrs, Friday and 4hrs Saturday. We will be bringing a MIG and some stock E36 M3 rear cans.

[TobyB]

I have an old Supertrapp with a lot (8? 10?) of discs that I carried when we ran really quiet (92 db) tracks.

It stuck out the back a bit, but it took that car from 98- 99 down to 88.

Also bring a bunch of elbows and bailing wire and small drill bits and stuff... and
you can fake up a lot.

t

[z31maniac]

Turn downs are also good since it won't be pointing toward the mic.

[djjerme]

If you know which side of the track the listening station is on, you can use a turn down to aim the exhaust away from it. Janxy, but it works.

[TobyB]

Some of the plumbing hanging off the back of the rotary Maaaaazdas is legendary...

t

[Axxe]

We have a downturn already, and it seems like we have one of the quietest cars around, maybe just stuffing the downturn full of steel wool and clamping some chicken wire over it might do the trick. Going to try my phone at 50', it can only measure to 81db though, might have to pony up for a ~$25 db measuring instrument.