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New 996 GT3 Exhaust by SpeedTech

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  #16  
Old 06-18-2012, 10:02 PM
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The turn down pipes will only reduce the high frequenzy sound the engine makes as the concrete absorbs those, and even than concrete bounces back 99% of the sound waves.

http://itsolution.lindab.com/LindabW...theory-ads.pdf
 
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  #17  
Old 06-18-2012, 10:13 PM
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Thanks F1 that was a good read. The curved pipes then, would seem to be the biggest factor in sound absorption. Last sound check was at Calabogie and that was on asphalt.
It would still be useful to know decibel levels with turn downs on both concrete and asphalt
 
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  #18  
Old 06-18-2012, 10:18 PM
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Homer997,

The system was designed with the goal of passing Mt. Tremblant. We took some decibel readings without the turn down tips and measured 89-91 db at 50' / 3500-4000 RPM's.

The car was noticably/dramatically quieter with the turn down tips installed. I was very surprised at the difference. I think the car is going to pass Mt. Tremblant with the TD tips, but I'm not certain. The owner is going to compare his car to other cars that are known to pass at Mt Tremblant with a decibel meter, while at Watkins Glen tomorrow.

We all thought it was like a completely different car with the turn down tips installed - much quieter to the bystander. They made a huge difference and I think we are certainly in the running for a good outcome at Mt. Tremblant...
 
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  #19  
Old 06-18-2012, 10:38 PM
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I am waiting with anticipation of this comparison. Your system appears to address well many aspects of exhaust design that is appealing, especially the modular aspects. I really hope this meets the DB limits!!
 
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  #20  
Old 06-18-2012, 11:20 PM
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Originally Posted by homer997 View Post
I am waiting with anticipation of this comparison. Your system appears to address well many aspects of exhaust design that is appealing, especially the modular aspects. I really hope this meets the DB limits!!
We do too!
 
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  #21  
Old 06-25-2012, 11:24 AM
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John,

any updates?

Vince
 
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  #22  
Old 06-25-2012, 12:06 PM
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Hi Vince,

Yes, the car was compared to a 997 GT3 that has passed the sound test at Mt. Tremblant and it was slightly louder (without the turn down tips installed). We feel that with the turn down tips it will pass, but we will not know for sure until it's there...
 
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  #23  
Old 06-25-2012, 06:51 PM
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99%? Really? Is this an actual figure and what was it based on?

Originally Posted by f1crazydriver View Post
The turn down pipes will only reduce the high frequenzy sound the engine makes as the concrete absorbs those, and even than concrete bounces back 99% of the sound waves.

http://itsolution.lindab.com/LindabW...theory-ads.pdf
 
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  #24  
Old 06-25-2012, 07:08 PM
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Mike, As I am sure you know, there is quite a difference in sound level with turn down tips from behind or beside the car. It's actually sounds like a different car - it's that dramatic.
 
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  #25  
Old 06-29-2012, 09:40 PM
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John, you know I do. Just poking our friend with a stick!

Mike

Mike, As I am sure you know, there is quite a difference in sound level with turn down tips from behind or beside the car. It's actually sounds like a different car - it's that dramatic.
 
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Old 06-30-2012, 03:46 PM
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Originally Posted by [email protected] View Post
To explain a little more in depth...There are several tip options available, such as:

* Simple slant cut 2 1/4" track tips for light weight
* Rolled edge, mirror polished 4" round tips for factory look
* OEM tips w/ OEM mufflers or equivilent when using just the catted X-
Pipe

** Then we have the optional track "turn-down" tips to direct the sound to the side or to the ground for tracks with decibal limits
Do you have a db reading from 50'?
 
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  #27  
Old 06-30-2012, 03:48 PM
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Sorry, i didnt read all the posts first
 
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  #28  
Old 07-02-2012, 02:27 PM
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John,
Have you or will you be dyno testing your system? I think the majority of your audience knows the real benefit of exhaust on these cars is weight and sound, however we still need to know we aren't putting something on the car that could potentially cost power.

There were custom build mid pipes independently built and tested recently on another board and shockingly one of the designs lost power and torque vs stock. Personally I dont think it matters if your system makes no power I think people like myself need to see that it doesn't cost power as a final selling point. The sound is awesome, the weight savings great, push me over the edge with dyno testing and make me a customer!
 
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  #29  
Old 07-02-2012, 04:31 PM
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Audion19's,

The car that we designed the system with is not ours and will not be dynoed by customer request. That said, we have used the exact same "X" design system on 996TT and 997TT cars and realized substantial gains over the stock system in both cases. It is a straight thru muffler design with no restrictions, baffles,etc. and also has high flow cats, in place of the OEM cats. Based on our experience of building and testing exhausts, there is no way this system will lose power over an OEM system. Just the weight savings is like adding HP, although I am not referring to that aspect, that's just an additional freebe.
 
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  #30  
Old 07-02-2012, 05:02 PM
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Originally Posted by Mikelly View Post
99%? Really? Is this an actual figure and what was it based on?
If you read the scientific article you will see why


Or I can break it down to you. If you need me to tell you how the math works




John,

Yes it sounds completely different because the tarmac absorbs certain frequency waves. Cmon guy's it is basic college science. Physics 101b. The graphs and the math tells it all.
 

Last edited by f1crazydriver; 07-02-2012 at 05:11 PM.
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