drotti

Has any one had a problem with their C7 Z06 Decibel level on Track Days. My buddy wants to run some Track Days at Laguna Seca and Sears Point, wants to know if his car is too loud in Track Mode.
Any help would be appreciated
Thanks, Scott

RichieRichZ06

The car is too loud to run at MRLS in any mode due to the flaps opening under WOT, even in quiet mode. The only way around MRLS sound check is to use fourth gear and keep the throttle light as you approach the sound booth. I have not heard of anybody getting booted from Sears for a car with stock exhaust being too loud.

harrydirty

My 07z registered 92.2db at Laguna a couple of years ago and since then I have rewired my exhaust so I can force the flaps closed when I go by the sound station. I have been able to run 90db days without any issues.

As Rich indicated, Sears is much more lenient so that should pose no problems.

Dirk Miller

I got the meat ball flag (black with big red dot) a while back there for doing 98 dbs between corners 5 and 6. I sort of expected it as I had just installed ZO6 exhaust manifolds, cats and H pipe on my 08 C6 that has GM's NPP exhausts. While I was clamping on four 45 degree turn downs on my exhaust ports an employee from the track (a friend of mine) instructed me to position them at the 10:00 position, which is what I did. And from then on I was not flagged. But boy did my car look knarley from behind.

Hasn't the decimal rating at Laguna Seca recently dropped to 90 dbs for most events? Kinda makes a guy gun shy.

Dado5

So that means i can't go to any track with my car..

DUMAN

THUNDER HILL is fine






not like you ever come

moose.b3

Most events at Thunderhill have a 103db limit. The cows don't seem to mind.

Along4theRide

On my last HPDE at MRLS, there was a stock Z06 blowing sound. After a move to "Stealth" on the exhaust, he was clearing it just fine. I think its totally possible to get by in this mode without blowing sound. Worst case, 4th gear up the hill, and lift a little right at the booth. MRLS is an awesome track, I think it's worth a little hassle for the adventure of the infamous cork-screw at least once in a while.

09Z06pj

Sad but true.

mxk

Don't forget the wandering hand-held sound-check guy at MRLS. I did. Yesterday was the first time I ever drove to a track, and then drove home, using the same tank of gas. Couldn't get three consecutive laps done in any session without a meatball flag, and was done for the day before lunch. Very disappointed.

harrydirty

If you have the exhaust system with the movable flaps, try wiring them shut or you can rig up a switch system like I did. Laguna is a world class track and a ton of fun.............don't give up!

If you have a c6z, I can help a bit by sharing what I did. I've been using a home-brewed switch system to shut the exhaust flaps at the sound check station and then opening them back up when I pass. I've run six track days at Laguna this way and have not been meatballed.

drotti

Thank you all for your replies!

c6hp4fun

Just for a data point, I got measured at Sonoma Raceway in my stock Z06 recently. 3rd gear flat out going past the S/F, had readings of 94 and 97 dB. Clearly too loud for Laguna Seca. I'm going there at the end of the month, am hoping that a short shift into 4th will save me.

Mamandoli

Hooked on Driving event this weekend. 4/16/2016.
A couple of Corvette buddies will be there. Weather in the high 70's.
Awesome track. 103db track also

Dirk Miller

For me it is plain and simple; 45 degree turn downs work. I'll not consider going there again without the ability to strap these on. They are extremely ugly but sure glad I had them my last day there.

mxk

I'm in, will see you there!

Mamandoli

I'll be in garage 16. Come by and say hi!!

Pacembellum

Anything i can stick in the open npp exhaust side of the muffler to quiet the car down? If a stock c7 z06 hit 97 im sure my borla x pipe would put it at 100 ish. 97 is the limit at Sonoma and im going there in april.

Ive​​​​Ive been thinking of wrapping the tip in exhaust wrap and trying to clamp a turn down on but the tips are flared.

Then i thought id force the valves closed but modify the muffler so more air can go through the quiet side and i dont break anything.

then​​then i thought i could install a non NPP stingray exhaust, this would be the quietest i think.

Any ideas.

Pacembellum

Ok i think the best way would be toto c off the npp side at the muffler, weld on v band clamp flange, then get a mandrel bend that matches and weld that to a small muffler sticking up.

Now you can run at laguna seca and sonoma and not get meatballed! Easy to switch back too.

Patrickd_21

sorry to bump an old thread, but this seems like a great idea. Anyone try this?