04-13-2024, 06:02 PM | #1 |
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Valve controllers and their effect on the power curve
Anybody here ever tested the difference if there is any controller makes on power. For example, anyone ever dynoed a stock car and a stock car with just valve controller to see opening the valves 100% makes any difference on the power curve of the S58. I am really curious to see if any gains can be made with just a controller. Especially on the top end I assume it should make a difference. Stock car never opens the valve 100 percent.
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04-14-2024, 11:15 AM | #3 |
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it's not a good idea to go wide open throttle with the valves closed.
whether its open 70% (stock) or 100% (with a valve controller), the sound difference is noticeable but don't expect any significant power increase.
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04-14-2024, 12:25 PM | #4 | |
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Now, enlarge the hole in the bucket so it's capable of flowing 3 GPM of water. But you're still filling it with a hose capable of flowing only 2 GPM. Is the water going to come out any faster? No. I would expect literally zero performance gain from a valve controller. |
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04-14-2024, 12:39 PM | #5 |
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I’ve looked at the factory calibration regarding valve control and in sport plus with the exhaust button on, the car commands 100% open position when the rpm > 4200 and torque request > 340NM. I’m not sure where the idea that the car never opens the valves 100% comes from but as far as I can tell it’s objectively untrue. The value of a valve controller is to open the valves all of the time, at lower rpm /load when the factory calibration does only open them partially or not at all.
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04-14-2024, 12:47 PM | #6 | |
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04-14-2024, 12:52 PM | #7 | |
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04-14-2024, 05:14 PM | #8 | |
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Well, I am an engineer so I got you covered. Let’s change my example from a 3 gpm hole and enlarge to a 5 gpm. Either way, the hole flows more gpm than the hose can fill the bucket. So decreasing the “restriction” makes no difference because it was never a restriction to begin with. Make more sense now? If the valves open at less than 100% has enough capacity to flow as much exhaust gas volume as the engine is capable of WOT, opening them to 100% won’t make a difference. |
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04-14-2024, 06:44 PM | #9 | |
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All that said I think people assume it never goes to 100% because they’re not out there hanging off the bumper and looking the exhaust, they just assume base on other standstill conditions or what they’ve “heard”. |
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