01-05-2011, 08:28 PM
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Senior Club Cobra Member
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Join Date: Jun 1999
Location: Fallbrook, CA USA,
CA
Cobra Make, Engine: Porsche 928 S4
Posts: 739
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Not Ranked
Machiavelli.
The JBL designed sidepipes as supplied in the past have the following characteristics:
Note this is Compression ratio based. There are other factors which increase sound pressure and I leave that research up to you.
9-1 Can cruise at 80 mph and still carry on a conversation at the top of your lungs.
10-1 Can cruise at 80 mph and not go completely deaf until one has covered 10 miles.
11-1 Can cruise at 20-80 mph and set off every alarm within 1500 meters as well as have bystanders throw various bits of fruit and vegetables at you as you go by.
12-1 Cannot attain any speed whatsoever or do anything if the engine is running without wearing earplugs or permanent hearing loss occurs.
Any compression ratio above the ones cataloged above just make your ears bleed no matter what you do. (Chicks dig this one for some reason.)
But these sound levels are what the customer base demanded and we responded as all good race car folks do.
Not sure what Larry is doing now.
Hopefully he has not pussied out on this design standard.
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