Hi guys. I have a 599 (obviously, thats why I'm here) and as much as I love the noise when the exhaust valves are open; under 4,000rpm it sounds like a Toyota and not very exciting. Is there a way to keep the valves open when under 4,000rpm? I took a look under the boot and noticed that the valve is open when the engine is turned off, and the valve seems to be operated by an air-hose of some kind. Is there a simple solution to keeping those valves open all the time. And would it do any harm in regards to exhaust back-pressure? Thanks in advance.
Our 599 has had a switch installed under the steering wheel which keeps the valves open in one position and returns them to their stock setting in the other. A dealer can do the installation within $500 (at least here in Europe). ...and the head-technician in the Modena dealership in Italy confirmed that it does not harm the car in any way (in fact he does such installations frequently). Do it. It's worth it Image Unavailable, Please Login
I just got my mechanic to permanently tie the valves open, the car sounds much better now! He told me that it would be slightly faster as well, but I haven't really noticed anything.
Yes...the throttle feels slightly more responsive with the valves open (not that you'd need any more responsiveness with that engine). It's easier for me to tell as I can experiment with that switch. With the valves always open the car sounds AMAZING IMO. Not too loud and not too quiet. It also sounds extremely good when downshifting and when releasing the accelerator. It really puts a smile on your face even when driving calmly
On the 575M, it is very easy to shuffle the vacuum hoses and have the valves open all the time. On the 575M, springs hold the valves closed and vacuum opens them (fail closed). Sounds like it may be the opposite on the 599 if they are open when the engine is turned off, they may be sprung open and vacuum closed (fail open). If so, just disconnecting the vacuum hose to the exhaust bypass solenoid should keep them open all the time. Disconnecting the individual vacuum lines to the pneumatic valves on the tailpipes should do the same thing. A 5 minute job for any good technician. I do not have a 599 WSM, so am just extrapolating from the 575M. Make sure any open connectors are plugged to prevent crud form gettin ginside. Some of the aftermarket exhaust systems actually have a remote that allows you to control the valves. Corvette owners for years have used one of their Homelink buttons to override the valves remotely, just like Carlo's switch. This parts catalog page from Ricambi's site shows the vacuum accumulator, vacuum lines, exhaust bypass solenoid, T fitting, and lines to the pneumatic tailpipe valves. Depending on how this system works, moving vacuum lines around or disconnecting vacuum lines will give you an easily reversible open valve capability. Taz Terry Phillips Image Unavailable, Please Login
Hello, tazandjan. Yes, it seems the 599 is the opposite, in case of an air-line leak etc. the valves would stay open. When the engine is off the valves are open and even stay open for a few seconds after starting the car giving a loud RoooM then settling to a purrr. I guess what I I need to know now is if there is any bypass hose or flow system that I would be interupting if I disconnect the hoses. Im sure I can't just unplug the hose and leave it as that would bleed off alot of air and cause whatever it is causing the vacum/pressure to work overtime. The diagram you gave looks fantastic and from studying it I'm guessing I need to 'modify' #32 or #36 as they look like some type of control unit.
Hex- If the vacuum closes them, all that is necessary is to pull the hose going into the bypass solenoid and plug the inlet to the solenoid and plug the line and tie it off. You could also pull the hose going from the vacuum accumulator and plug the accumulator outlet and hose end. Alternatively, pull the lines going to the individual tailpipe pneumatic valves and plug the lines and both pneumatic valve inlets. No problems with vacuum in any of those cases as long as the lines and inlets/outlets are plugged. It all just depends on which lines are easiest to reach. Much easier than a 575M, where vacuum holds them open and you need to move hoses around to have continuous vacuum. Taz Terry Phillips
Taz, I just disconnected the lines going to each muffler solenoid and plugged them.. I have not thrown a cel,is this going to hurt anything in the long run? I also had the secondary cats removed and replaced them with straight pipes from Fabspeed wow do they sound great!. Hit that baby hard in second or third going through a tunnel and its pure bliss,lol..Kevin
F57- Absolutely no problems with the valves being permanently open on a V12. The valves are a long way from the engine and keeping them open has no effect, except on engine music and back pressure. The problem cars are some of the V8s, especially the F355, where the valve is very close to the engine. Taz Terry Phillips
No CEL when using the Fabspeed straight throughs? The Fabspeed website doesnt have any sound clip. Can you post something for us to hear. Thanks
The question was whether overriding the exhaust bypass valves would cause problems like a CEL and the answer is no. There is no relationship between that answer and using manufacturers' exhaust components that bypass major parts of the emission control system. Talk to the manufacturer for those answers. Taz Terry Phillips
The service manager at my official dealer told me this would cause the 599 to lose all its bottom end torque. Can anyone confirm that having the valves open would cause this? Thanks
That is not true at all. My car has the valves open permanently plus the Fabspeed secondary cat delete. No issues, no CEL, just lots of smiles.
Kind of hard to lose all the torque on a 6 liter V12. If someone did dyno runs, there might be a slight loss of torque at very low revs, but the valves open automatically at somewhere around 2700 rpm depending on throttle setting. Nobody's rear end dynamometer is going to notice it, however, and the improvement in low rev music will be noticeable. Those valves are mostly for noise regulations on European drive cycles.
That is BS that you lose all bottom end torque. With respect to the Service Manager and I know who he is, he is not a tech. It is correct that when you lose some back pressure there is a drop in torque but you do not lose all bottom end torque. These motors are producing so much torque that you will not notice losing 2% to 5%. The engine revs so readily that you are past 3,000 revs in a split second and your engine is in its torque band. JKay you are close to Port Botany, go down there early Sunday morning do a recon run to see if there is any HWP if not, do a launch with your exhaust valves operating as normal. Then do the same launch after you open your valves with your controller and then come back and tell me that you noticed a detrimental difference when you launched her with the valves open.
G'day Frostie I might already have had a little run and tried that out Can't say I've noticed any drop in torque at the bottom end Car is much louder too, and can hear those lovely crackles Way better than stock
Your exhaust Bypass work with vacuum and should be failed open Engine management will control the vacuum feed through a solenoid actioned valve Just disconnecting the solenoid plug will allow you to drive with the bypass always opened. It is a better solution than unplugging vacuum lines in and out as they can crack by tried to pull them out where as the electric connector is a plug The part is number 32 on the diagram below, it is clearly on the left side of the engine bay, near the secondary air injection pump, I do not know the 599 but on the 612 it is all the way in front bumper ( on the right side though ) Good luck with this SECONDARY AIR PUMP - Ferrari 599 GTB Fiorano
Another way to go is to un-click the lever, unscrew it and tight up the valve. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
All I can tell you is, if you show the car at a Concours, the first thing they look at on start up is that the valves close. I think it's a one point deduction if they don't.
Michel, Thanks for your suggestion. It makes sense and for sure will be cleaner than to close the vacuum plumbing to the exhausts. My 612 has the valves and the sports exhaust (it is a pre-OTO), but I never managed to find the schematics for this version - which should be similar to the OTOs. Do you happen to know where we can find the schematics (the ones in the usual sites like Eurospares is for the first 612s - no valves)? Thanks again.
The target was 1995 Ferrari V12 F1.....we got it an a bit more ( or a bit too much for the public roads ) Image Unavailable, Please Login