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Old 10-27-2016, 05:33 PM
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Secret Sauce to easily pass AMP sound testing?

A friend of mine that is primarily an autocrosser has a C7 Z06 and was able to get his car to pass the sound restrictions at AMP. If a 6.2L supercharged V8 making 650HP and 650ft/lbs of torque can pass sound I don't see why every car can't do the same thing. I suspect cars like Jim Cozzolinos NSX or even Tony's Evo could pass with this insert (email quote below) added that can easily be added/removed.

I also saw a new Camaro (w/455HP) that passed the sound test with the only modification being 90 degree elbows added to the tips to point the sound to the passenger/right side and away from the meter.

Jeremy Renshaw, Terry Denton and several others have gotten their BMWs to pass sound too and it would be cool if they could share what they did to increase the success rate of not just street cars but all competition cars so everyone can play at this wonderful track that is right here in town!


Quote:
---------- Forwarded message ----------
Date: Tuesday, October 25, 2016
Subject: AMP secret sauce for Corvette
To: Tage Evanson <tage@nasaaz.com>

Redline did the manufacturing that I specified so that it would fit directly in the tailpipe of the Z06. The guts (the important part) is this: http://www.carchemistry.com/baffle/
Got about 7 dB using the 3 disk CC insert with packing.
Good luck.


From: Tage Evanson [mailto:tage@nasaaz.com]
Sent: Tuesday, October 25, 2016 7:59 AM
Subject: Re: AMP secret sauce for Corvette

Oh this is fantastic news! Do you have a picture that I can share with my general membership? Will Redline Performance Manuf. be selling this baffle as an off the shelf part?

We have TT & Race points events at AMP next year and I would love to be able to prescribe solutions for nearly all cars which with this sounds like it will be close to possible to do so.


<xxx> wrote:
I did design an easily installed and removed baffle that fits in the tailpipe of my C7 Z06. I think 5 Z06ís have successfully passed AMP sound limits. Doesnít seem to affect the power much. I gave the plans to Jonny at Redline Performance Manufacturing. http://www.rpmheaders.com/. He has the secret sauce and may be able to adapt it to other cars.
Let me know if you need anything else.
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  #2  
Old 10-27-2016, 05:43 PM
EricSS EricSS is offline
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A little off topic but should the new Camaro pass with the optional dual mode exhaust in stealth mode? That keeps the muffler bypass valves closed full time. Both my SS Sedan and Camaro SS have the dual mode exhaust and in track mode they are LOUD for a stock exhaust but in stealth mode they don't seem to bad.
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Old 10-27-2016, 07:02 PM
SCCAForums.com SCCAForums.com is offline
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Definitely agree... would like more people to spend $250 (one time) and be able to run AMP multiple times! Vs. we're all willing to 'travel' to Chuckwalla or INDE multiple times... and spend considerably more than the track we have in our back yard!

It might help to bring these to a 'local' (high participation event) and offer them to be fitted/sold right there!

Possibly a discount towards first 'AMP' event for those who purchase/install.

Looking for some solution to get AMP more frequent to our schedule.

Best Regards,
Dave
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Old 10-28-2016, 09:34 AM
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I'll probably pick up a set of these as a backup option.

I have my stock "quiet" mufflers in the garage and working on getting a set of 45* or 90* deflector pipes fit up for them.
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Old 10-28-2016, 10:09 AM
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I can't pass period But ill come watch every time i can!
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Old 10-28-2016, 10:28 AM
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Quote:
Originally Posted by IntegraLS View Post
I can't pass period But ill come watch every time i can!
Disagree. An Ariel Atom with an intake out in the open and muffler pointing AT the meter can pass! Plenty of cars making more exhaust noise than yours can pass so if the only thing left if the intake, I bet that could be addressed as well with a scoop diverter if that is the issue. What dB did it blow when you have tried in the past?
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  #7  
Old 10-28-2016, 10:49 AM
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Quote:
Originally Posted by Tage View Post
A friend of mine that is primarily an autocrosser has a C7 Z06 and was able to get his car to pass the sound restrictions at AMP. If a 6.2L supercharged V8 making 650HP and 650ft/lbs of torque can pass sound I don't see why every car can't do the same thing. I suspect cars like Jim Cozzolinos NSX or even Tony's Evo could pass with this insert (email quote below) added that can easily be added/removed.

I also saw a new Camaro (w/455HP) that passed the sound test with the only modification being 90 degree elbows added to the tips to point the sound to the passenger/right side and away from the meter.

Jeremy Renshaw, Terry Denton and several others have gotten their BMWs to pass sound too and it would be cool if they could share what they did to increase the success rate of not just street cars but all competition cars so everyone can play at this wonderful track that is right here in town!
I don't have a picture yet but the Camaro's setup was great and easy to replicate. Those cars have dual outlets on each side and he had a 90-degree elbow in each one. They had a tab welded between them with a nut welded to the middle of it. Further back by the muffler hangers was another welded tab and a nut. Connecting the two tabs, and holding the pipes in place, was something like all-thread and some nuts. Genius simple.
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Old 10-28-2016, 10:55 AM
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Ravi my Mustang is about to pass...don't be so pessimistic. Also I just bought some of those baffles as a back-up measure.
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Last edited by ArizonaGT; 10-28-2016 at 12:45 PM.
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  #9  
Old 10-28-2016, 11:13 AM
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Quote:
Originally Posted by Tage View Post
Disagree. An Ariel Atom with an intake out in the open and muffler pointing AT the meter can pass! Plenty of cars making more exhaust noise than yours can pass so if the only thing left if the intake, I bet that could be addressed as well with a scoop diverter if that is the issue. What dB did it blow when you have tried in the past?
with OEM exhaust it was blowing 101. It's all ITB noise... was the same readings with the aftermarket exhaust, so its clearly the intake. Shit the OEM white car blew 92.8 haha
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  #10  
Old 10-28-2016, 02:33 PM
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Tage Tage is offline
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Quote:
Originally Posted by IntegraLS View Post
with OEM exhaust it was blowing 101. It's all ITB noise... was the same readings with the aftermarket exhaust, so its clearly the intake. Shit the OEM white car blew 92.8 haha
Put some little mufflers on those ITBs!
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