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Modifying the exhaust valves

Discussion in '612/599' started by hextronik, Sep 28, 2009.

  1. hextronik

    hextronik Rookie

    Jul 2, 2009
    4
    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.
     
  2. Ferrarista3

    Ferrarista3 F1 Rookie

    Oct 30, 2007
    4,530
    MC/UK
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    Carlo
    #2 Ferrarista3, Sep 28, 2009
    Last edited by a moderator: Sep 7, 2017
    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 ;)
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  3. Sareve

    Sareve F1 Rookie

    Oct 23, 2007
    2,953
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    Daniel
    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.
     
  4. Ferrarista3

    Ferrarista3 F1 Rookie

    Oct 30, 2007
    4,530
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    Carlo
    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 :)
     
  5. Sareve

    Sareve F1 Rookie

    Oct 23, 2007
    2,953
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    Daniel
    You're absolutely right! But the car is still quieter than my friend's completely unmodified 430 :(
     
  6. tazandjan

    tazandjan Two Time F1 World Champ
    Owner Lifetime Rossa

    Jul 19, 2008
    28,851
    Albuquerque, NM
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    Terry H Phillips
    #6 tazandjan, Sep 29, 2009
    Last edited by a moderator: Sep 7, 2017
    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
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  7. hextronik

    hextronik Rookie

    Jul 2, 2009
    4
    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.
     
  8. tazandjan

    tazandjan Two Time F1 World Champ
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    Jul 19, 2008
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    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
     
  9. Fiorano57

    Fiorano57 Formula 3
    BANNED

    Dec 23, 2010
    1,622
    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
     
  10. tazandjan

    tazandjan Two Time F1 World Champ
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    Jul 19, 2008
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    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
     
  11. coupe1

    coupe1 Formula 3

    Jan 15, 2007
    1,462
    Singapore
    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
     
  12. tazandjan

    tazandjan Two Time F1 World Champ
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    Jul 19, 2008
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    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
     
  13. Jkay

    Jkay Karting

    Jan 9, 2017
    241
    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
     
  14. Roupin

    Roupin Formula 3

    Oct 7, 2013
    2,167
    Encino
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    Roupin
    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.
     
  15. tazandjan

    tazandjan Two Time F1 World Champ
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    Jul 19, 2008
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    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.
     
  16. FERR430dxb

    FERR430dxb Rookie

    May 10, 2016
    24
    Capristo offers a valve controller remote for around $ 800 .
    I installed that on my F430 and 599 .
     
  17. MrF355

    MrF355 Formula Junior

    Mar 4, 2008
    276
    Sydney
    Full Name:
    Frosty
    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.
     
  18. Jkay

    Jkay Karting

    Jan 9, 2017
    241
    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
     
  19. swiss612

    swiss612 Karting

    May 10, 2016
    217
    Zurich
    Full Name:
    Michel
    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
     
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  20. F3RN4ND0

    F3RN4ND0 Karting

    Nov 16, 2015
    72
    Madrid, Spain
    Full Name:
    Fernando B.
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  21. TrojanFan

    TrojanFan F1 Rookie
    Silver Subscribed Owner

    Nov 17, 2008
    3,414
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    Peter
    Swiss, what are you disconnecting on your 612?
     
  22. FIN612

    FIN612 Rookie
    Silver Subscribed

    May 10, 2017
    26
    Finland
    Here you can see a couple clips of my 2008 612 HGTC after some serious mods :)




     
  23. George Vosburgh

    George Vosburgh Formula 3
    Silver Subscribed

    May 26, 2011
    2,436
    Pittsburgh, PA
    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.
     

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