[BarchettaGuy]

I thought I would start this thread to hear exhaust sounds of different muffler/pipe configurations.

My 2001 Barchetta has Tubi's with a Ceramic Coated X-Pipe that I purchased from our local Ferrari dealer:

[BarchettaGuy]

I really like the way this car sounds:

Ferrari 550 Maranello - Hyperflow x-pipe and Novitec exhaust - YouTube

[champagne612]

Originally Posted by BarchettaGuy

I really like the way this car sounds:

Ferrari 550 Maranello - Hyperflow x-pipe and Novitec exhaust - YouTube

Great thread ... hopefully you won't mind this addition

Ferrari 612 Scaglietti HGTC LOUD Revs and Accelerations - HD - YouTube

[BarchettaGuy]

Originally Posted by champagne612

Great thread ... hopefully you won't mind this addition

Ferrari 612 Scaglietti HGTC LOUD Revs and Accelerations - HD - YouTube

Sorry Doug, I didn't mean to exclude the other V12's such as your 612, the 456's and 599's.
There is just something about the way the V12's sound.
Nice car and exhaust sound.
I still have that kid in me that likes the sound of powerful engines.

[tazandjan]

Domenic- That 550 is fitted with my old Novitec system that I sold after buying my HGTC exhaust. You could look straight through the inboard pipes so not a whole lot of muffling going on with Novitec Supersports.

Your Barchetta sounds great. Early 550 Tubis and straight or X-Pipes sound really full race, like yours does.

Taz
Terry Phillips

[BarchettaGuy]

Originally Posted by tazandjan

Domenic- That 550 is fitted with my old Novitec system that I sold after buying my HGTC exhaust. You could look straight through the inboard pipes so not a whole lot of muffling going on with Novitec Supersports.

Your Barchetta sounds great. Early 550 Tubis and straight or X-Pipes sound really full race, like yours does.

Taz
Terry Phillips

Thanks Terry,

Do you happen to have a sound clip of your 575M? I would be curious to hear how it sounds.

[tazandjan]

Domenic- Unfortunately, no I do not, and I do not have a video camera. The 575Ms have a great advantage, as you know, because the opening schedule on the bypass valves is so much more generous than for the 550. The 550, like the F355, only opens at WOT above an undocumented rpm. The WSM says to check operation at WOT and 5000 rpm, so not sure where it opens. The F355 is 3000 rpm and WOT in all the gears except 3rd, where it is 4000 rpm. No clue on the 550.

On the 575M, the valves are open at idle (~750 rpm) and close at 1000 rpm and then reopen at 2720 rpm and 64% engine load. So they are open more and you get a really nice rumble at idle, which is some 250 rpm below the 550's idle.

Have to see if one of the neighbors with young kids or grandkids has a camera.

Taz
Terry Phillips

[BarchettaGuy]

Originally Posted by tazandjan

Domenic- Unfortunately, no I do not, and I do not have a video camera. The 575Ms have a great advantage, as you know, because the opening schedule on the bypass valves is so much more generous than for the 550. The 550, like the F355, only opens at WOT above an undocumented rpm. The WSM says to check operation at WOT and 5000 rpm, so not sure where it opens. The F355 is 3000 rpm and WOT in all the gears except 3rd, where it is 4000 rpm. No clue on the 550.

On the 575M, the valves are open at idle (~750 rpm) and close at 1000 rpm and then reopen at 2720 rpm and 64% engine load. So they are open more and you get a really nice rumble at idle, which is some 250 rpm below the 550's idle.

Have to see if one of the neighbors with young kids or grandkids has a camera.

Taz
Terry Phillips

Sounds good and I am sure your exhaust sounds quite nice with your configuration.

[ccferrari]

Dear Terry,
I was just wondering about the comments regarding the exhaust note on the 575M and the various valve openings below 1000 rpms then opening at 2400, etc.

I've gone the entire route, Tubi, etc. without finding a proper blend of good exhaust note without the droning sound. I even put a stock 550 OEM muffler on my 2003 575M with the stock straight pipes in place of the center resonators (because the build date on my 575 was before Ferrari got rid of the center resonator so I bought new 575 OEM straight pipes), and am willing to try buying an OEM 575M exhaust system but am wondering, is in fact, the valve opening actuated through the ECU system and not the 575M muffler valve alone. And, even if I convert over to the OEM 575M muffler, I may not get the various pleasant valve opening rpm trigger points because it might furthermors require an ECU change also???

Just inquiring as this is getting to be an expensive experiment that may come full circle to the beginning point??? I'm pretty satisfied with the current 575 straight pipes and 550 mufflers except it might be nice to hear a "little" more aggressive exhaust note at 750rpms.

Any perspective would be greatly appreciated.
ccferrari

[tazandjan]

CC- Welcome to Ferrari Life. On another thread, a couple of 575M owners are telling me their valves are closed at idle, so I may be all wet on that one. Will have to check on mine.

The Motronic ECU definitely tells the bypass solenoid valve when to allow vaccuum to reach the pneumatic valves. See the other thread for the schedule. What I will try and determine is whether there is any difference in the early (pre-Assembly Number 49203) and later Motronic ECUs on the exhaust valve opening schedule.

My car has the factory straight pipes that came with it originally, and a Superamerica HGTC exhaust, and it is more of a purr at cruise speeds than a drone. That exhaust is way too expensive, though, unless you find a used one like I did. I gave away a set of late 575M mufflers, and those did not seem to drone to me. If I were spending money on an exhaust, it would be a valved Kreissieg or Capristo for me.

Some owners have had luck getting rid of their drone with X-Pipes, especially those with Tubis, and those cost only a little hp and torque. Like you said, though, there are a lot of combinations. The mufflers for the center muffler/resonator cars and straight pipe cars are different, but how different, I do not know.

On my car there is a slight resonance at ~2500 rpm when cold, but as the exhaust warms, it goes away.

Taz
Terry Phillips

[KonaDog06]

Was going to wait to post about our exhaust when I had pictures for the three generations of Maranello mufflers (short of HGTC). Figured this might be helpful now.
Have two here, late 575 p/n 200997 & 998 (first pics) and 550 p/n 167998 & 999 (second pics), and soon to follow early 575 p/n's 181797 & 798. Just recently removed late gen Tubi's from my 2002 and replaced them with the correct mufflers (181797 & 798). Never took pics before installing these, didn't think about it. Will be installing my old Tubi's on friends 2002 shortly and will get pics then. Pics are taken from rear with bypass valves removed.

On these mufflers you have a single inlet coming in on the outer side of the car (relative to it's position on the muffler). At the rear, you have the two exhaust tips, primary side of exhaust on the outer side of car. The bypass valves are inboard and open possibly at idle for some years, and for sure under throttle as per Taz up the RPM range. What I tried to show in these pictures is that the 550 exhaust comes in and hits a plate at 90 degrees, then routes left or right to respective locations. You can see no daylight through these.
On the late 575, the exhaust comes to the inlet, enters and bends around to the secondary/bypass side and you can see daylight looking through the muffler. It sort of goes out of it's way to go to the primary side of the muffler and has a more direct route towards the secondary or bypass side. It has to have better flow.
It seemed to me when looking through the early 575's that there was even more daylight visible however will have to wait to compare pics versus a poor memory.
Last pic is the inlet side on 550 muffler.
Bill
FL
1st pic, complete muffler
2nd, 200998 bypass outlet (can see light)
3rd, 167998 bypass outlet (flat plate @ 90 degrees)
4th, 167998 inlet side

[tazandjan]

Bill- Good shots. Should have done the same for my HGTC muffler cans, but never thought of it about two years ago. The Novitec Supersports had lots of daylight on the inboard taipipes. You could have stuck a yard stick through from either end.

I always thought the 550 mufflers were lower restriction, but maybe not.

Taz
Terry Phillips

[champagne612]

Originally Posted by BarchettaGuy

Sorry Doug, I didn't mean to exclude the other V12's such as your 612, the 456's and 599's.
There is just something about the way the V12's sound.
Nice car and exhaust sound.
I still have that kid in me that likes the sound of powerful engines.

No problem Domenic ... best sound I ever herd was from a stock 550 with some brand of exhaust that a lot of porsche guys install.

It sounded like 1000 hp was being run

[tazandjan]

Incidentally, if nobody read the other thread, my valves are closed at idle, not open, so I screwed that one up.

Taz
Terry Phillips

[ccferrari]

Thank you Taz, Barchettaguy, Konaguy...
All the valuable and honest information is very helpful. I'm going to stick with my current setup for now as it is a pleasure to hear a nice exhaust note and the sweet mechanical symphony from the engine and 6-speed transmission and not get beaten down by the droning.

( Hmmmm...after seeing Konadog's pictures...it has got me thinking... :-) ...I guess that's why we're car guys and gals... ;-) )

ccferrari

[Granucci]

Welcome CC. Post pics of your car.

[BarchettaGuy]

Originally Posted by champagne612

No problem Domenic ... best sound I ever herd was from a stock 550 with some brand of exhaust that a lot of porsche guys install.

It sounded like 1000 hp was being run

I would have liked to hear that........I never tire of the different types of aggressive exhaust sounds on these F-cars.......and my neighbours don't seem to mind either.......

[KonaDog06]

Took a couple minutes to look closer at the two mufflers previously mentioned above. Used a flexible digital scope to explore these a little further. Attached find pics of 550 diagram somewhat detailed and a very rough draft of late 575. Sorry about the technology.
Describing what's going on here (550), the air flow comes in at the inlet and flows down a perforated pipe that dead ends at a metal plate (see inlet pic in prior post above). The exhaust air can ONLY escape through the small holes you see in the perforated pipe. It escapes into the "muffler box". The only exit from here with the bypass valve closed is the primary exhaust tip which has a slightly smaller diameter exit pipe than the bypass side. Could not get an I.D. on this one, O.D. was 2.145" versus bypass pipe size of at least 2.25" I.D.. The exit pipes for the tips are solid (noted by bolder line) pipe ending short of the solid plate that is at the rear (front relative to car) of each respective exit pipe. There is an air gap of 2.5" between the end of the solid pipe on bypass side and the end plate, then an air gap of 3" between solid pipe and end plate on primary side.
On the drawing for the 575 muffler, the inlet air is basically a straight shot bending around slightly to the bypass exhaust tip. It has a solid section of pipe several inches long followed by a perforated section several inches long, followed again by a smaller section of perforated, ending with a few more inches of solid pipe. In this case, the exhaust air is directed directly to the bypass exit only getting out to the primary side through the perforations in the pipe, and more so when the bypass valve is closed. Note that the drawings are not in correct proportions.
In my opinion the 550 muffler can no way flow more air than the 575 when the bypass valves are open. Closed the 550 may flow more. Would probably take time on a dyno to know with certainty.

Bill
FL

1st pic, 550 muffler

[tazandjan]

Bill- First scientific look I have seen of the mufflers. Thanks. Would sure seem to indicate the 575M with valves open has considerably lower backpressure, except possibly for the pre-cats.

The one thing you miss with the valves is most of the popping and burbling on downshifts, because the valves are usually closed on a trailing throttle. That is what I miss most about the Novitecs, the trailing throttle music and the pop on upshifts, as that let up on the throttle by the F1 TCU allowed cold air into the exhaust, which then ignited with the unburned fuel mixture.

[KonaDog06]

Sorry again about the scrambled notes, obviously not an engineering background here. Would also like to add that I have no vendetta against the 550 muffler/silencer. It is by accident that I ended up with one of each of these and thought, given the opportunity it would be good to look closer and clear up some information about them. Eventually, I'll post the differences as best possible between the early and late 575 mufflers.

Bill
FL