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Hi - I'm running a 12.5:1 TR6 motor with a Goodparts header and a single 1=
2" glass-pack and a turn-down (indexed to point away from the sound meter).=
This weekend past at Thompson, CT (local to you, Brian) I was under 95 dba=
according to the sheets that I saw. I need to confirm that with the Chief =
of Sound because there was some confusion about the TRACK limit of 100 dba =
measured on the front straight at start/finish - I'm not sure what the dist=
ance from the track is, but it's gotta be either 50 or 75 feet. I ran a lot=
of different lines at start finish due to traffic, and sounds never called=
me in (no black flags). And if you know sound, the distance from the sourc=
e makes a HUGE difference in the readings. FWIW, the SCCA GCR now has a sou=
nd limit published and that includes the distance from the sound meter. But=
you probably know that already.
I would concur from others that run them that they spiral core mufflers out=
there will probably keep you under the sound limits for Thompson (and prob=
ably Palmer too.) I know Solo folks running the spiral core and they meet t=
he even stricter sound limits in Solo (for local venues like Devens in Ayer=
, MA).
Contrary to others' reports, I don't detect any power loss with this setup,=
but I've never dyno'd the straight-pipe setup. My old setup with the Dynom=
ax "turbo" muffler was quiet as a mouse at WOT and I never set off sound an=
d (apparently) I was making "plenty of power". The problem with that setup =
is that it takes up too much space under the car and your GT6 would be even=
more cramped for the space unless you run the pipes into the passenger foo=
t well and out the right side of the car (not that I've ever tried to figur=
e out how to do that)
;-)
c ya,Bob Lang
On Tuesday, October 9, 2018, 3:19:02 PM EDT, Chris Marx via Fot <fot@au=
tox.team.net> wrote: =20
=20
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I had no idea that there are noise limits in USA for race cars.
Thought that is only in Europe.
=C2=A0
Cheers
Chris
=C2=A0
Von: Fot <fot-bounces@autox.team.net> Im Auftrag von Brian Dennis via Fot
Gesendet: Montag, 8. Oktober 2018 22:08
An: FOT Triumph <fot@autox.team.net>
Betreff: [Fot] Mufflers?
=C2=A0
What are folks using on GT6 to get noise down to 98db? Full race 12:1 2.0L.=
Most local (New England) tracks have noise rules. Some have open exhaust d=
ays but are limited.
Thanks, Brian=C2=A0
Foster, RI
Sent from Yahoo Mail for iPhone
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
@yahoo.com
=20
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<html><head></head><body><div class=3D"ydpc0cf66acyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
<div>Hi - I'm running a 12.5:1 TR6 motor with a Goodparts header an=
d a single 12" glass-pack and a turn-down (indexed to point away from the s=
ound meter). This weekend past at Thompson, CT (local to you, Brian) I was =
under 95 dba according to the sheets that I saw. I need to confirm that wit=
h the Chief of Sound because there was some confusion about the TRACK limit=
of 100 dba measured on the front straight at start/finish - I'm not sure w=
hat the distance from the track is, but it's gotta be either 50 or 75 feet.=
I ran a lot of different lines at start finish due to traffic, and sounds =
never called me in (no black flags). And if you know sound, the distance fr=
om the source makes a HUGE difference in the readings. FWIW, the SCCA GCR n=
ow has a sound limit published and that includes the distance from the soun=
d meter. But you probably know that already.<br></div><div><br></div><div>I=
would concur from others that run them that they spiral core mufflers out =
there will probably keep you under the sound limits for Thompson (and proba=
bly Palmer too.) I know Solo folks running the spiral core and they meet th=
e even stricter sound limits in Solo (for local venues like Devens in Ayer,=
MA).<br></div><div><br></div><div>Contrary to others' reports, I don't det=
ect any power loss with this setup, but I've never dyno'd the straight-pipe=
setup. My old setup with the Dynomax "turbo" muffler was quiet as a mouse =
at WOT and I never set off sound and (apparently) I was making "plenty of p=
ower". The problem with that setup is that it takes up too much space under=
the car and your GT6 would be even more cramped for the space unless you r=
un the pipes into the passenger foot well and out the right side of the car=
(not that I've ever tried to figure out how to do that)</div><div><br></di=
v><div>;-)</div><div><br></div><div>c ya,</div><div>Bob Lang<br></div><div>=
<br></div>
=20
</div><div id=3D"yahoo_quoted_9978054619" class=3D"yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Tuesday, October 9, 2018, 3:19:02 PM EDT, Chris Marx=
via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
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#yiv1773540966 </style><div><div class=3D"yiv1773540966WordSection1"><p cla=
ss=3D"yiv1773540966MsoNormal"><span style=3D"" lang=3D"EN-US">I had no idea=
that there are noise limits in USA for race cars.</span></p><p class=3D"yi=
v1773540966MsoNormal"><span style=3D"" lang=3D"EN-US">Thought that is only =
in Europe.</span></p><p class=3D"yiv1773540966MsoNormal"><span style=3D"" l=
ang=3D"EN-US"> </span></p><p class=3D"yiv1773540966MsoNormal"><span s=
tyle=3D"" lang=3D"EN-US">Cheers</span></p><p class=3D"yiv1773540966MsoNorma=
l"><span style=3D"" lang=3D"EN-US">Chris</span></p><p class=3D"yiv177354096=
6MsoNormal"><span style=3D"" lang=3D"EN-US"> </span></p><div class=3D=
"yiv1773540966yqt0963322574" id=3D"yiv1773540966yqt50672"><div><div style=
=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm;">=
<p class=3D"yiv1773540966MsoNormal"><b>Von:</b> Fot <fot-bounces@autox.t=
eam.net> <b>Im Auftrag von </b>Brian Dennis via Fot<br clear=3D"none"><b=
>Gesendet:</b> Montag, 8. Oktober 2018 22:08<br clear=3D"none"><b>An:</b> F=
OT Triumph <fot@autox.team.net><br clear=3D"none"><b>Betreff:</b> [Fo=
t] Mufflers?</p></div></div><p class=3D"yiv1773540966MsoNormal"> </p>=
<p class=3D"yiv1773540966MsoNormal">What are folks using on GT6 to get nois=
e down to 98db? Full race 12:1 2.0L. Most local (New England) tracks have n=
oise rules. Some have open exhaust days but are limited.</p><div><p class=
=3D"yiv1773540966MsoNormal">Thanks, Brian </p></div><div><p class=3D"y=
iv1773540966MsoNormal">Foster, RI<br clear=3D"none"><br clear=3D"none"><br =
clear=3D"none"><a rel=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D=
"https://overview.mail.yahoo.com/?.src=3DiOS";>Sent from Yahoo Mail for iPho=
ne</a></p></div></div></div></div></div><div class=3D"yqt0963322574" id=3D"=
yqt44461">_______________________________________________<br clear=3D"none"=
><a shape=3D"rect" ymailto=3D"mailto:fot@autox.team.net"; href=3D"mailto:fot=
@autox.team.net">fot@autox.team.net</a><br clear=3D"none"><br clear=3D"none=
"><a shape=3D"rect" href=3D"http://www.fot-racing.com"; target=3D"_blank">ht=
tp://www.fot-racing.com</a><br clear=3D"none"><br clear=3D"none">Donate: <a=
shape=3D"rect" href=3D"http://www.team.net/donate.html"; target=3D"_blank">=
rect" href=3D"http://www.team.net/pipermail/fot"; target=3D"_blank">http://w=
ww.team.net/pipermail/fot</a><br clear=3D"none">Unsubscribe/Manage: <a shap=
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one"></div></div>
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http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
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