430 When do your exhaust valves open? (F430)

when I press the "magic: button...

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Interesting. According to @360trev , the valves can be half open (or perhaps even modulated between fully open and fully closed) via solenoid valve control. I assumed they were either fully open or fully closed.

 

Mine would vary, depending on throttle position and RPMs. For example, I could go to high RPMs with them on "quiet" setting, so long as I didn't go past 50% throttle (roughly). I got tired of them constantly opening and closing, so I disconnected them.

 

The valves under ECU control always drove me nuts. Too much on and off. Forza valve controller fixed that. Always open when the switch is down:

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3k on my car

 

So if I hit the throttle hard, +50%, it cracks at 3K. If I feather the throttle I can go into the 4k range. Like @BlacktopRacing mentioned, it really depends on the throttle. I just went for a ride and paid attention.

 

it works well. I can flip the switch up and let the ECU do its thing when I start it early in the morning or if I’m coming home late. Then just flip the switch and leave the valves wide open, which is how I usually leave it 90% of the time. I just have to wire the illumination into that switch and I can call it officially done.

 

yes around 3000rpm it opens !