Mt Tam I am's Driving Journal

wstar

What with the db-level sound check thing? Is that some CA environmental reg stuff, or because the track is close to offices/apartments or something? I've never heard of a db-check at tracks here, and there's some insanely loud cars in the upper run groups at some of our DEs. A couple are just straight up tube-frame custom race cars that look like they belong in a NASCAR event and sound about the same, too.

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ChrisSlicks

It's usually related to the track's proximity to other property. Track's on the east coast have it as well as up in Canada. 92dB is a pretty common limit, and many tracks will black flag you if you go over the limit. This is the east coast list that I have.

NHMS: 99 dB @ 50ft (never enforced to my knowledge)
Mont Tremblant: 92 dB
Mosport: No limit
Summit Point: 103dB @ 50ft
Lime Rock Park: 86-88dB @ 50ft (depending on club)
Calabogie: 92dB @ 50 ft
Watkins Glen: No limit

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Mt Tam I am

Laguna is the only track I've been to where the db level is the law and enforced. Houses seem to make the difference.

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Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

Mt Tam I am

Because the multi million dollar home owners have a louder voice than the track fans. The county has a strange db limit regulation, I do not know or understand. It is strictly enforced. Many of the cars have LS pipes, which are angled away from the sound booth on turns 5/6 uphill straight.

Our club last year got three 92 db days and they were much cheaper by $10,000 - $15,000 than this years 105 db days. $280 vs $170 although a big difference, made no difference in my attendance. Sell out at all events. It is a great track.

The club has been offered some 90 db days and rejected them as too low for club members to make. I wanted to find out where I was if we did take a 90db day and I came in at 85 db. Now I know I can go. Or screw with test pipes.

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Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

ChrisSlicks

I have the ART pipes since they are quieter than the alternatives, came in at 88dB at my last reading. I think straight test pipes would be a little higher, maybe right around 90dB.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Mt Tam I am

Cool beans. I would have thought a worse reading. How much actual HP do you gain removing the catalytic converters?

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Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

ChrisSlicks

10-15hp over stock cats I would say.

For street driving the biggest issue is hiss and rasp at lower RPM's, but once it's revving the sound is very nice.

Exhaust leaks are a problem though, the only gasket you can use that works is the metal gasket from Z1 which is similar to OEM design but perhaps stronger.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Mt Tam I am

Here is my final Laguna Seca video post from Monday. It is my second run. I have another that is more of a warm up for me while I work on turn 2 with a double apex. This video here has the same, better worked out.

Nissan 370Z at Laguna Seca - CFRA 6/3/13 - YouTube

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Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber