Here in CO.,most of the tracks & events have a 105db limit measured at
50ft,and at 90 degrees from the driver's side.We run a 1300 Spitfire, with a
straight pipe & a donturn at the end (Lake sidepipe style) and have had no
trouble meeting noise levels to date. This includes Pikes Peak International
Raceway, and Steamboat where they are especially noise conscious.
Mark Haynes
RMVR-#162
> -----Original Message-----
> From: Simon Favre [SMTP:simon@mondes.com]
> Sent: Thursday, April 01, 1999 12:19 PM
> To: Vintage Race
> Subject: Re: MGB Exhaust
>
> It depends more on the track than the club. Laguna Seca has the tightest
> sound limits. They only get 4 "loud" weekends a year. Fortunately, the
> Monterey Historics are one of them. All club events at Laguna must meet
> the sound limits. Early morning groups can be forced to run as low as 92
> db, which pretty much means small bore cars with nearly stock exhaust.
> The SCCA Vintage event at Laguna is typicaly a real black flag festival
> over the sound limits. ;=( The entire Porsche Unlimited group got black
> flagged at one of them.
>
> There are no sound limits at Thunder Hill. ;=) Sears Point is either 103,
> or 105, I think. At Sears Point, the restriction is on hours of operation.
> No race engines are supposed to be run outside of a time window (8A-6P?).
>
> I would tend to think a 948cc motor with a straight pipe should come in
> well under 103 db. I make about 97 db with a Fiat 1100 in a Formula Jr.
> (straight pipe) I have no problem at Laguna if I bolt on a Supertrap.
>
> RodsINTOMG@aol.com wrote:
> >
> > In a message dated 99-03-31 08:32:34 EST, you write:
> >
> > <<
> > Just out of curiosity, what is the db limitations of your club? I'll be
> > racing with VSCDA in the WI, IL, MI, IN area this year and a couple
> tracks
> > (Gingerman, MI, Grattan, MI, and Blackhawk, IL) have 103 db limits. I
> run a
> > 948 Sprite with a straight "Hooker"-styled side pipe and I'm concerned
> > about this with the season starting real soon. Regards,
> >
> > Greg Schulz
> > VSCDA Grp. 2, Sprite #517
> > Cedarburg, WI
> > >>
> >
> > Greg,
> >
> > I have looked in my club newsletters and even the General Rules and
> Safety
> > regulations and cannot find what the limit is. I would guess it's
> slightly
> > more that 103 for Sears Point and less for Laguna Seca. Can someone
> else in
> > CSRG help with this one? Miles, are you there?
> >
> > Rod Schweiger
|