Mike A.

Anyone ever run a straight pipe (no cat, no muffler) on a 951 at Lime Rock? I'm wondering if it will pass the noise restriction of 84 decibels.
They monitor it about 50 feet from the track at the end of the front straight, after you lift the throttle.

Dbltime

My guess would be no way Jose'. But if the wind is blowing over 10 knots you can get away with a lot. Calm winds and you will need to bolt in your sink drains.

Mike A.

Thanks Bill. I kinda thought that, but I was hoping that a turbo may be just quite enough.
If Home Depot has run out of dish drains, can I borrow yours?
Just kidding...I know you'll need them for yourself.

Dbltime

I have cornered the sink drain market and sold them to FABSPEED. They are now known as "Super Cup Performance Booster Incerts". Dyno proven to raise horse power by 50 (each side), honest. $495. per set which includes my commission <img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" /> What a Country!

<img src="http://gallery.rennlist.com/gallery/albun03/race_exhaust" alt=" - " />

Bill Gregory

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica"><strong>They monitor it about 50 feet from the track at the end of the front straight, after you lift the throttle.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I've also heard that they sometimes monitor it at the track out point on the downhill.

Geoffrey

From my experience no! Lime Rock has an 84db limit and will give you to 89db. I've been busted with a fully muffeled 930 Turbo (unmuffeled wastegate) at 91db and asked to park my car. They started the day measuring sound at the track out point at the downhill (beginning of the straight) which is where they first got me in the first run group. I short shifted for the remaining sessions, but did see them taking sound measurements on "no name straight", the short chute between "the uphill" and "west bend", so they do get around and are NOT flexible. When I was black flagged, they would not even tell me where they got me, only how loud I was.

Barry Lenoble

Hey,

I run at lime rock in my car, 89 951 w/open pipe (no cat, no muffler)
and I have no problems with noise.

Barry

James Achard

They have been checking just before the bridge at the downhill this year. I saw Officer Friendly there recently. Pretty lame since all the sound channels right to that spot....

Cheers, James

Dbltime

I think the wind has a lot to do with it. Last years Club Race it was blowing pretty good and I was not aware of any violations.

Roeblin Road also has a sound regulation. We drove the first practice day in 12 knots or so of wind without issue. The next day it was dead calm and I was black flagged for something like 12db over the limit.

In any event come prepared to cut the sound back if need be.

Mike Buck

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by bill walczak:
<strong>
In any event come prepared to cut the sound back if need be.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">SFR exhausts work great for this. I can go from roaring straightpipe to whispering muffler in 5 minutes <img border="0" title="" alt="[Wink]" src="wink.gif" />

Haven't encountered any noise problems yet, but I do head to LCMT in August. I believe they have a 93dB limit.

Geoffrey

Bill,

Rick Deman had noise issues at last year's club race with his muffeled GT1R GT2 Turbo, again, an unmuffeled wastegate seems the most likely issue.

Mike A.

I guess I'll leave the muffler on for the LRP race, although I am intrigued that Barry has no problems going with out.

Geoffrey

Mike,

Will you be at the DE on Thursday before the race?

Mike A.

Geoffrey,
That's my plan.

996racer

Any thoughts on making my 996TT pass the LRP noise restrictions? I currently have B&B headers and fabspeed cats w/o mufflers and by the time I go back to LRP I will have added a set of K24's. Last time they told me I was over by 5 db and that was with a set of short downturns installed. What have others done to solve problems like this?