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I wonder if you take the valves out of the JCR exhaust what would be the impact on sound? Many of us would always have the valves open...why not get rid of them like center bypass systems on GT3 and GT3 RS?
ok, disconnected the vacuum lines over the weekend, valves open all the time. Definitely louded than stock under 4k rpm and can hear the downshift blips now.
Valves are open anyway over 3800rpm with the PSE button pressed
They’re open at idle then close pretty much as soon as the clutch is up until 3800rpm where they remain open
With the PSE button ‘off’ the valves stay closed until 5000rpm depending on throttle input
Either way regardless of the PSE button position the valves are open at WOT over 5000rpm
Any reports of the valves cycling or being partially open isn’t true. The Valve logic is the same as it’s been for many years
JC
This is good information know about these valves and how they operate, so is it correct to assume that you designed your exhaust to work in conjunction with the factory programming here?
Valves are open anyway over 3800rpm with the PSE button pressed
They’re open at idle then close pretty much as soon as the clutch is up until 3800rpm where they remain open
With the PSE button ‘off’ the valves stay closed until 5000rpm depending on throttle input
Either way regardless of the PSE button position the valves are open at WOT over 5000rpm
Any reports of the valves cycling or being partially open isn’t true. The Valve logic is the same as it’s been for many years
JC
by disconnecting the vacuum lines, the valve are always open, so the sound missing once clutch is up to 3800rpm is now there, as well as, the auto blip has much more sound now
by disconnecting the vacuum lines, the valve are always open, so the sound missing once clutch is up to 3800rpm is now there, as well as, the auto blip has much more sound now
now it's all open, do you feel you could be happy just as is vs. having to mod it more?
So the OP's valve mods look like they connect to electronic valve actuators. The US guy unplugged vacuum hoses from vacuum actuated valves (like 718 and 991 porsches). Looks like there might be some differences?
So the OP's valve mods look like they connect to electronic valve actuators. The US guy unplugged vacuum hoses from vacuum actuated valves (like 718 and 991 porsches). Looks like there might be some differences?
I’ve just ordered the Cargraphic stuff as I wanted to keep the ability to put the exhaust back to normal easily. I will report once installed (post-confinement...)
How is this different that the PSE console button? Does it override the valve logic? Meaning when activated, the valves will stay open no matter the tachometer reading (between idle and 3,800rpm)?? If yes, does this render the PSE console button redundant?
How is this different that the PSE console button? Does it override the valve logic? Meaning when activated, the valves will stay open no matter the tachometer reading (between idle and 3,800rpm)?? If yes, does this render the PSE console button redundant?
I believe when it’s activated it opens the valves at all speeds. When it is off the pse button and valves work as Porsche intended.
Not the way to go in my opinion. Disconnect the hoses (I could do it easily by hand with moderate force). Insert grub screw in M6 size and thread it in
with a t-handle allen wrench. Use pliers to hold the hose while doing this. The grub screw should be inserted about 20mm into the hose, so you can
completely re-attach it on the exhaust valve. Same procedure on the other side.
Benefits: Invisible, no open ends to be sealed, cheap and quick. Also easy to undo by screwing the grub back out anytime
Peter
Wow, I found this a really good idea, if actually work as smooth & clean as it sounds.. here are the first questions that comes into my mind:
Is there any length recommended for the grub screws?
Is there any risk of the grubs to get "sucked-in" and causing a big issue?, what would be the worst case scenario?
On what car has the M6 size actually been tested? 981 GT4?, 718 GT4? other?, are all hoses the same size?
Can the screw damage the hose? how many screwing would the hose take before start wearing inside? (not relevant?)
05-02-2020, 04:55 PM
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