SCUD Exhaust VERY QUIET ??

Collected my SCUD today and must say the exhaust is way quieter than my 430 Spider and I expected the opposite, what's going on here ?? Yours confused.

 

The Scud is louder stock vs stock. You just need a different exhaust on the Scud, thats all.

 

The Euro Scud was 106db ex-factory once the valves open way louder than a stock car

Two possibilities are either your valves don't open or they put on a special quiet Swiss market exhaust - oh or a third : you weren't driving fast enough !

 

I had a 430 and currently have a Scud and my experience is that the Scud exhaust is much louder particularly once the valve opens at ~3500rpm, its a great sound that wakes up the neighbors.

 

Richard, as mentionned before and as you're very "hands-on", I would check the exhaust valves operation and make sure there is no vacuum leak and that the connectors to the solenoid valves are fine. European Scud are even louder than those of the US market because they don't have the pre-cats in the headers. The exhaust valves can be prone to failure because there don't have a heat-shield bowl on it. I had one failing recently. The exhaust valve took a long time to open and close. Lets us know how it goes

 

I can hear the valves open, but it is still like a KITTEN compared to 430 Spider and even CS, when I expected a LION. My 430 Spider has a deep manly sound on start up and its missing here. It certainly goes fast enough but I'm for now soundwise I'm gobsmacked

 

Richard,

is this something new or has it always been like this. If this is recent , manually open the valves to test and see if the sound changes...

 

Disconnect the vacuum lines and plug it should sound manly at all times then. Congrats BTW

 

How did it sound on the test drive?

 

I didn't test drive it, it was serviced on Friday. I just know how my 430 sounds below 4,000 rpm vs the CS so simply assumed it would be at least as loud, it has 1,700 miles. It sounds rather like my CS when I start it in Race which it shouldn't with 4.3 litre engine (the guy who bought my CS didn't test drive it either, lots of trust over here and you have to sign legally binding docs re car history etc)

 

Richard- The by-pass valves do not care what mode the Manettino is using. The solenoid operation is controlled by the Motronic ECUs based on rpm and throttle setting only. I cannot tell from the F430 workshop manual whether the F430 and Scud valves are fail open or fail close.

Good advice on checking the vacuum lines to the pneumatic valves. On some cars you can check operation by looking and seeing whether the valves are open or closed through the tailpipes, but yours are too far up the pipes for that to work. Maybe Stef can tell you how to check for correct operation.

Taz
Terry Phillips

 

Richard, maybe the problem is somewhere else (blocked cats...) but lets check first the most evident things. On the F430 and Scud, the exhaust valves are failed open. When the engine is idling, they should be closed and vacuum is needed to get them closed. If you had a failure on the vacuum system (leaking vacuum hoses or vacuum tank, failing solenoid valves etc), you should have a loud exhaust when idling...which isn't the case. Are you sure that your exhaust flaps aren't stuck closed. When you actuate the exhaust valves mecanism, can you open and close them easily? To access your exhaust valves, have a look to the pictures on this thread : http://www.ferrarichat.com/forum/showthread.php?t=245241&highlight=Scuderia+exhaust+valves&page=2


If the exhaust valves are not the problem, then you'll have to inspect the other parts of the exhaust and make sure the cats are operating well. How does feel the engine response?

I just can't imagine the Scud is less louder than your Spider except if you remove all the cats from them and you had a straight exhaust line (which I can't imagine here in Switzerland )

Stef

 

I believe the 430 exhaust valves do briefly open on starting, is this not the case with the SCUD

 

I have had and tracked a 430 and a CS extensively. Now have a Scud and it is definitely louder then the other two

 

Actually on the 430 as well as the Scud, they are open before you start the engine. When the engine is started, it takes a second or two to get enough vacuum from the intake into the vacuum tank to get the valves closed.

 

Mine has not been driven for a year or so but everything should have been sorted at the Ferrari Service I guess

 

The Scuderia is the loudest among the F430, Spider, even the F430 Challenge is quieter.

Your valves may not be opening. My stock Scuderia exceeds the SCCA Solo and ProSolo sound limit which is 100 db at 50ft away. At the pipes it runs 104 db bone stock.

The valves are open when you start the car, then they close, and they open again at two points: 3,200 rpm at WOT, or 6,000 rpm at any throttle position.

 

Sounds then like 1 of the 2 Valves might be stuck, thing is they are not as easy to access as 430 or CS

 

Congrats on your new car... have you already posted any pix?

 

They are very easy to access. Remove the rear diffuser (it takes me 10 minutes), use WD40 on the valve rods, as they can get stuck due to moisture on cars sitting for long periods of time. Super easy job. You can also adjust how close and how open you want them, changing the length of the rod using the threaded body.