Can we get this for the 928?
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Burning Brakes
Joined: Mar 2002
Posts: 752
Likes: 1
From: Skokie, IL
Can we get this for the 928?
I saw a drop top Modena the other day. It couldn't be revving past 5,000 but it was music to my ears. Reading this makes me wonder how it'd sound with the same system on a 928.
European Car Magazine:
Ferrari Challenge Stradale
The new car is lighter, stronger and faster than the 360 Modena F1, from which it is derived, and for enthusiasts all of the changes are for the better. The bottom line is a car that costs $40,000 more than a regular 360 but is stripped of most comfort items. That should steer poseurs and casual enthusiasts away, while the rigid racing seats, carbon-fiber interior bits and fantastic muffler-bypass exhaust system make the car utterly irresistable for the hardcore car nuts.
The single most attractive aspect of the Challenge Stradale is its trick automatic muffler bypass valve, which lets the engine sing completely unmuffled when driven hard but lets the car creep past sensitive neighbors--and EPA drive by noise tests--with the relative stealth of the regular 360 Modena. The muffler bypass valve opens at 8500 rpm and above, when the throttle is open 30% wider.
Drive gently, and Supermans garish costume remains hidden beneath Clark kent's subdued gray flannel suit.......
European Car Magazine:
Ferrari Challenge Stradale
The new car is lighter, stronger and faster than the 360 Modena F1, from which it is derived, and for enthusiasts all of the changes are for the better. The bottom line is a car that costs $40,000 more than a regular 360 but is stripped of most comfort items. That should steer poseurs and casual enthusiasts away, while the rigid racing seats, carbon-fiber interior bits and fantastic muffler-bypass exhaust system make the car utterly irresistable for the hardcore car nuts.
The single most attractive aspect of the Challenge Stradale is its trick automatic muffler bypass valve, which lets the engine sing completely unmuffled when driven hard but lets the car creep past sensitive neighbors--and EPA drive by noise tests--with the relative stealth of the regular 360 Modena. The muffler bypass valve opens at 8500 rpm and above, when the throttle is open 30% wider.
Drive gently, and Supermans garish costume remains hidden beneath Clark kent's subdued gray flannel suit.......
Drifting
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From: Los Angeles, CA
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Ferrari V-8 engines run a "flat crankshaft" it runs as two 4 cylinder engines same firing order . That makes a completely different sound than a "normal 90 degree V-8 " .
Drifting
Joined: Jul 2002
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From: Los Angeles, CA
Still, it would be cool to have a system like this car, so you can keep the valves closed on the muffler for normal street driving, and open the valves for the track... Like those old cast iron Y-valves, so you could dump the exhaust to a side-pipe for racing, but keep the rest of the exhaust system stock for daily street driving...
Drifting
Joined: Jul 2002
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From: Los Angeles, CA
http://www.jcwhitney.com/product.jhtml?CATID=5199&BQ=sv
This?
Yeah..
That could put a look of surprise on someone's face, when you pulled that cable...
Too bad they don't have a 3" diameter version.
This?
Yeah..
That could put a look of surprise on someone's face, when you pulled that cable...
Too bad they don't have a 3" diameter version.
Administrator
Joined: Aug 2001
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From: Up Nort
Saw a 96 LT4 corvette with one on, the power effects muffler shown above. Sounded sweet, but I always did have a soft spot in my heart for Vette's........don't hold it against me please.
A friend of mine cut his 79 muffler open, re did the inside to have a pass through pipe, while the other pipe was a circular chamber with slits cut in it wrapped in fiberglass. Externally it looked stock. Pull a lever by the seat, straight through, close it - as quiet as stock. I cut both mufflers off my 81, running straight after the CAT. At 70mph with the windows down, you cannot hear a thing. First gear open throttle? It sounds like a sports car should. Shows how restrictive the CAT and cat iron manifolds are.
A friend of mine cut his 79 muffler open, re did the inside to have a pass through pipe, while the other pipe was a circular chamber with slits cut in it wrapped in fiberglass. Externally it looked stock. Pull a lever by the seat, straight through, close it - as quiet as stock. I cut both mufflers off my 81, running straight after the CAT. At 70mph with the windows down, you cannot hear a thing. First gear open throttle? It sounds like a sports car should. Shows how restrictive the CAT and cat iron manifolds are.
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Nordschleife Master
Joined: Aug 2002
Posts: 9,010
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From: South Texas
Maybe get rid of the cable, and throw a vacuum actuater down there with a spring.
The idea being, high vacuum, arrange it so the by pass is closed. Low mannafold vacuum, by pass open. When your cruiseing around town, you keep the throtal valve closed, and the vacuum high. When you floor it, the vacuum falls to near nothing, and the by pass will open up. No?
Anyways, if I had the money to do it, it would be cool. I'm jsut happy that my a/c works, and my exaust doesn't leak!
The idea being, high vacuum, arrange it so the by pass is closed. Low mannafold vacuum, by pass open. When your cruiseing around town, you keep the throtal valve closed, and the vacuum high. When you floor it, the vacuum falls to near nothing, and the by pass will open up. No?
Anyways, if I had the money to do it, it would be cool. I'm jsut happy that my a/c works, and my exaust doesn't leak!
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Drifting
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From: Redondo Beach, CA>>>>Atlanta,GA
I have seen an electric version of the old cast iron y pipe. You could build an electronic controler that would open it at a certian rpm via recieving a 0-5v signal. I am not sure of the cost of the cost of the stainless electric slider y pipe but the controler kit I speak of was less than $20.
HTH
Andy K
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Andy K
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Saw this a while back, now they require membership to view the whole article, but you get the idea:
Link: Autospeed | variable back-pressure exhaust valve
'70s Cadillac V8's (other GM too) have a similar valve off the right manifold for quicker warmup. IIRC they are about 2 1/2" or so.
I made a goofy spring loaded setup at the exhaust tip, which made it quiet, but hurt higher speed performance. I ended up switching mufflers and removed them.
Link: Autospeed | variable back-pressure exhaust valve
'70s Cadillac V8's (other GM too) have a similar valve off the right manifold for quicker warmup. IIRC they are about 2 1/2" or so.
I made a goofy spring loaded setup at the exhaust tip, which made it quiet, but hurt higher speed performance. I ended up switching mufflers and removed them.
Three Wheelin'
Joined: Sep 2002
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From: No Turbo, No SC
Three Wheelin'
Joined: Sep 2002
Posts: 1,477
Likes: 2
From: No Turbo, No SC
With Factory cat.s, resonatores installed and an RMB? It's not that loud.
With a Cat. test pipe, resonators and an RMB? I think it might
With a Cat. test pipe, mufflers in place of the resonators and an RMB? Yea buddy!
With a Cat. test pipe, resonators and an RMB? I think it might
With a Cat. test pipe, mufflers in place of the resonators and an RMB? Yea buddy!