Side mufflers - options
12-29-2016, 05:41 PM
#16
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You're welcome. The OEM side mufflers that I have have total of 46K miles. Of those miles are two track days.
__________________
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
12-29-2016, 05:58 PM
#17
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I have the non-valved side delete pipes (Cargraphic) and OEM center muffler but I'm thinking about the valved version from TPC to bring sound levels down when needed. Do you have any measuements for the sound with valves both closed and open? On local trackdays noise limits are measured at 4500rpm at 45 degree angle, 0,5m from exhaust. I am now at appr. 102dB, would be nice to how many dB the valved version can lower the static noise at a given rpm.
12-29-2016, 07:07 PM
#18
12-29-2016, 08:55 PM
#19
Rennlist Member
DB ratings are highly environmental dependent.
My setup: 100 cell cup headers, bypass pipes, stock center muffler measures about 102 at thunder hill. A center delete may be a little louder. this is on a 3.6L.
My setup: 100 cell cup headers, bypass pipes, stock center muffler measures about 102 at thunder hill. A center delete may be a little louder. this is on a 3.6L.
12-29-2016, 09:18 PM
#20
Banned
On my .2 GT3 with OEM headers, OEM side mufflers, and GMG bypass I blew 104.1 db at thunderhill on a clear day back in July. Might have been an anomaly as I've driven thunderhill about 5 other times and never had any sound issues.
12-29-2016, 10:32 PM
#21
Rennlist Member
see, my setup is muffled, always (well still loud under full tilt).
The center bypass is nearly a straight pipe once the valves open
TH is weird, sometimes they measure sometimes they don't
Usually they are after hoons like chasen blowing 115db and pegging the meter.
The center bypass is nearly a straight pipe once the valves open
TH is weird, sometimes they measure sometimes they don't
Usually they are after hoons like chasen blowing 115db and pegging the meter.
12-30-2016, 03:11 AM
#22
Banned
Wow 115db!?!
12-30-2016, 08:12 PM
#23
Rennlist Member
Yea, I pegged that ****. Was hoping by session 3 i'd have broken it, but no shot.
01-01-2017, 03:14 PM
#24
I agree to that, but I think the difference between open/closed valves in a given setup would always be more or less the same, even if the dB values themselves differ with the envionment. I.e. if the difference is 2dB some will measure 99/101dB, while others might measure 102/104dB. The difference should be quite stable and thus a useful measurement anyway. This of course doing a static measurement at the same angle, distance and rpm. Fly-by measurements are of course out the window in this regard:-D.