12-01-2020, 12:29 PM | #1 |
Drives: 2020 ZL1 1LE Join Date: Nov 2020
Location: Cave Creek, AZ
Posts: 6
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Arizona Motorsport Park sound limit
Hi, all. This is my first post, as I bought a new 2020 ZL1 1LE last weekend. After about 20 years off the track, I want to get back into it with the ZL1. Arizona Motorsport Park is about 45 minutes from me, but they have a 96dB limit at 50' (tested as a full-throttle drive-by before the track day starts), which I've been told a stock ZL1 won't pass. Have any of you driven at AMP? Their website shows all sorts of cars/motorcycles that I know would never pass the limit, so I'm a bit perplexed. Thanks for any insight!
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Bill
2020 ZL1 1LE Cave Creek, AZ |
12-01-2020, 12:35 PM | #2 |
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Drives: 18 ZLE Join Date: May 2018
Location: Left Side of the Moon
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Get some slip on clamp on turn downs made.. it will knock noise level down significantly. Been way of life at many tracks, not sexy, but very functional. Minimal impact on power level. Beats sitting out.
Example: https://www.uspmotorsports.com/AWE-T...-Down-Kit.html
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12-02-2020, 01:03 PM | #3 |
Drives: 2020 ZL1 1LE Join Date: Nov 2020
Location: Cave Creek, AZ
Posts: 6
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Does anyone know if putting the (stock) exhaust in Stealth mode will keep the valves closed, even under WOT? If it doesn't, then I could put it in Stealth and then pull the valve fuse, thus keeping the valves closed for the sound test. Then I'd just put the fuse back in before the track event started.
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Bill
2020 ZL1 1LE Cave Creek, AZ |
12-02-2020, 01:12 PM | #4 |
Drives: 2018 Hyper Blue 2SS 1LE Join Date: Aug 2018
Location: Dessert
Posts: 486
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If you pull the fuse, you lose power to the valves, and the valves default to open from spring pressure. I don't know if the valves stay closed at WOT when in Stealth mode. Best to go out and try it to confirm. But don't do it a lot, someone blew up their muffler and melted their rear fascia trying to pass sound in Stealth at a track.
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2018 Hyper Blue Metallic 2SS 1LE with Nav, PDR, and track alignment
1:34.20 Willow Springs Big Track |
12-06-2020, 02:22 PM | #5 | |
Sound level
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12-06-2020, 04:01 PM | #6 |
Drives: 2018 ZL1 coupe Join Date: Nov 2018
Location: Prescott, Arizona
Posts: 589
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Couple things...
First, they do check sound throughout the day... you can't just 'fake it' for the sound check. Second, keeping the car in 'stealth' mode generates too much heat on track and will likely destroy your bumper. This is not my photo, but this is worst case... I cut off the outer tips on our ZL1 and added V bands so I could make turnouts to direct the sound away from the sound check location. It passes at Arizona Motorsports Park with our otherwise stock exhaust. After the track day, just swap the stock tips back on. The other option is just lift past the sound check locations, but where's the fun in that? |
12-06-2020, 04:43 PM | #7 |
Drives: Chevrolet Camaro, Ford Mustang Join Date: Oct 2019
Location: AZ
Posts: 388
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Just get turndowns made, there is no way to pass sound in a ZL1 without turn downs.
If you have an SS, then you can pass sound with out any turndowns. Here's a pic of mine with turn downs as well: Best regards, Dave
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2022 SS 1LE - Vivid Orange - SCCA CAM-C & Optima Ultimate Street Car GT
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12-06-2020, 05:58 PM | #8 |
Drives: '19 ZLE, S54 E36M3 Join Date: Feb 2018
Location: North Augusta, SC
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I suppose those F16s taking off across the street meet 96 dB......... I ran there shortly after the track was built.
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12-06-2020, 06:07 PM | #9 |
Drives: 2018 ZL1 coupe Join Date: Nov 2018
Location: Prescott, Arizona
Posts: 589
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I've seen them shut down sound checks while the planes are taking off if the AF is playing on a weekend morning...
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12-06-2020, 07:02 PM | #10 | |
Drives: Chevrolet Camaro, Ford Mustang Join Date: Oct 2019
Location: AZ
Posts: 388
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Quote:
Best Regards, Dave
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2022 SS 1LE - Vivid Orange - SCCA CAM-C & Optima Ultimate Street Car GT
Katech, MSD, QA1, Hurst, Anderson Composites, ProParts USA Custom Suspension, MFR Engineering, Forgeline Wheels, G-Loc Brakes, Nine Lives Racing, MTX Audio, Penske Rapid Repair |
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02-18-2021, 09:20 AM | #11 |
Drives: 2020 ZL1 1LE Join Date: Nov 2020
Location: Cave Creek, AZ
Posts: 6
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Thanks for all the suggestions, guys. I passed sound just fine with the Laguna pipes I had fabricated. I can swivel the pipes depending on the side of the track where the sound booth is located (or which direction we're running).
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Bill
2020 ZL1 1LE Cave Creek, AZ |
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