Too Loud

Tim202 · 10-16-2017, 10:01 AM

Not sure if this should be in the Autocross or General section or not.

At the stadium we autocross at there is a 92db at 50' max noise limit. This is measured at every event and where a car is on throttle.

Yesterday my car blew sound with a 94.x db. I was in Track mode. My three options were to:

A: Put it in Tour mode.
B: Enter settings and put the exhaust in Tour/quiet mode while staying in Track, but was told that I shouldn't be doing high performance driving with the exhaust in that mode.
C: Lift at the sound meter position.

I went with option C.

Anywho, does anyone know of a way to make the exhaust a little quieter without doing damage to the exhaust or lifting?

Can'tHave2MuchHP · 10-16-2017, 10:14 AM

You have 100% bone stock exhaust? Cats, headers, secondary cats and mufflers?

If so, then do not mess with your exhaust. Unless you're going to be tracking there every day or something. I wouldn't worry about one track. Furthermore though I highly doubt a bone stock car will break rules. Again, do not mess with your car because of one track.

I also don't think running in health/tour/quiet will hurt your car, even when tracking.

LiqTenExp · 10-16-2017, 11:09 AM

Note:

Even if you forced it to stealth mode it will open up fully under moderate/heavily loaded conditions.

Quote:

Originally Posted by Tim202

Not sure if this should be in the Autocross or General section or not.

At the stadium we autocross at there is a 92db at 50' max noise limit. This is measured at every event and where a car is on throttle.

Yesterday my car blew sound with a 94.x db. I was in Track mode. My three options were to:

A: Put it in Tour mode.
B: Enter settings and put the exhaust in Tour/quiet mode while staying in Track, but was told that I shouldn't be doing high performance driving with the exhaust in that mode.
C: Lift at the sound meter position.

I went with option C.

Anywho, does anyone know of a way to make the exhaust a little quieter without doing damage to the exhaust or lifting?

MoreSpeed · 10-16-2017, 12:09 PM

I have had no issues with sound dba at a variety of autox venues and I have been autox’ing the ZL1 all season (but it is stock). It may be a fluke given where they were taking the readings. I would talk to one of the sound people to see if all the cars were reading high or try a different event. I would definitely not modify the car to make it more quiet.

I would definitely lift in your situation. I think you give away way to much not being in track with all interventions off time wise on the rest of the course and tour at full throttle is not exactly quiet either.

Tim202 · 10-16-2017, 01:40 PM

Quote:

Originally Posted by Can'tHave2MuchHP

You have 100% bone stock exhaust? Cats, headers, secondary cats and mufflers?

Yes, sorry about not mentioning that, I have bone stock everything.

For the "don't worry about this track" people. It's the stadium parking lot and there are no other venues within at least 100 miles that autocross.

Stephen12ZL1 · 10-16-2017, 03:29 PM

I think stealth mode can be checked and the baffles never open and should meet the 92db max. Then, proceed to select track mode for suspension, steering or PTM.

Dethsupp0rt · 10-16-2017, 04:42 PM

And here I am wishing mine was louder, but I really don't want to do anything more than an axle-back.

bucknut2006 · 10-16-2017, 04:48 PM

The ZL1 did score the highest decibel rating at the Lightning Lap this year I believe.

Infern0 · 10-16-2017, 08:33 PM

Didn’t the GT350 beat the ZL1 in the motortrend ignition episode as a better car because it had a louder exhaust?

Sent from my iPhone using Tapatalk

brantley847 · 10-16-2017, 09:02 PM

Screw that. Headers, cam, THEN lift

10-16-2017, 10:01 AM	#1
Tim202 Drives: 2018 ZL1 1LE Join Date: Dec 2016 Location: San Diego, CA Posts: 218	Too Loud Not sure if this should be in the Autocross or General section or not. At the stadium we autocross at there is a 92db at 50' max noise limit. This is measured at every event and where a car is on throttle. Yesterday my car blew sound with a 94.x db. I was in Track mode. My three options were to: A: Put it in Tour mode. B: Enter settings and put the exhaust in Tour/quiet mode while staying in Track, but was told that I shouldn't be doing high performance driving with the exhaust in that mode. C: Lift at the sound meter position. I went with option C. Anywho, does anyone know of a way to make the exhaust a little quieter without doing damage to the exhaust or lifting?

10-16-2017, 12:09 PM	#4
MoreSpeed Drives: 2017 Hyper Blue A10 ZL1 Join Date: Dec 2016 Location: New England Posts: 716	I have had no issues with sound dba at a variety of autox venues and I have been autox’ing the ZL1 all season (but it is stock). It may be a fluke given where they were taking the readings. I would talk to one of the sound people to see if all the cars were reading high or try a different event. I would definitely not modify the car to make it more quiet. I would definitely lift in your situation. I think you give away way to much not being in track with all interventions off time wise on the rest of the course and tour at full throttle is not exactly quiet either. __________________ - Life is a highway... I want to ride it all night long... Sold 2010 997 GT3, 2016 WRX, 2006 997 C2S, 2003 996 C4S, 2001 Boxster S, 1997 E420 AMG etc..

10-16-2017, 03:29 PM	#6
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,824	I think stealth mode can be checked and the baffles never open and should meet the 92db max. Then, proceed to select track mode for suspension, steering or PTM. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

10-16-2017, 04:48 PM	#8
bucknut2006 Drives: 2017 ZL1 A10, 2015 C7 Z51 Join Date: Aug 2011 Location: Atlanta, GA Posts: 222	The ZL1 did score the highest decibel rating at the Lightning Lap this year I believe. __________________ 2017 Camaro ZL1 - Nightfall Gray Metallic - A10 - Roto-Fab intake

10-16-2017, 08:33 PM	#9
Infern0 Bring It Drives: In Between Join Date: Sep 2009 Location: San Antonio, TX Posts: 2,929 View My Garage	Didn’t the GT350 beat the ZL1 in the motortrend ignition episode as a better car because it had a louder exhaust? Sent from my iPhone using Tapatalk __________________ 2017 Camaro ZL1 M6 - Everything but the sunroof - Sold 2010 Camaro SS - 650RWHP Daily Driver - Traded

10-16-2017, 10:14 AM	#2
Can'tHave2MuchHP Drives: Fast Join Date: Mar 2015 Location: Michigan Posts: 3,696	You have 100% bone stock exhaust? Cats, headers, secondary cats and mufflers? If so, then do not mess with your exhaust. Unless you're going to be tracking there every day or something. I wouldn't worry about one track. Furthermore though I highly doubt a bone stock car will break rules. Again, do not mess with your car because of one track. I also don't think running in health/tour/quiet will hurt your car, even when tracking.

10-16-2017, 04:42 PM	#7
Dethsupp0rt Drives: None Join Date: May 2017 Location: Chicago, IL Posts: 462	And here I am wishing mine was louder, but I really don't want to do anything more than an axle-back.

10-16-2017, 09:02 PM	#10
brantley847 v It bites. Drives: 2011 IBM 2SS/RS Join Date: May 2008 Location: Orlando, FL Posts: 3,580	Screw that. Headers, cam, THEN lift __________________ 2011 2SS/RS Performance: 439 RWHP: 226/236 Comp Cam, Kooks 1-7/8, CAInc, Borla S type, Vmax TB, Rx Catch Can, Trans cooler, SLP 160 termo, Melling high volume, Eibach Springs/Sways 1" drop, Whiteline complete bushing kit.

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