idle air valve
#1
idle air valve
I was reading a book about tuning and notice a section about idle air valve and superchargers and how some recommend letting the IAC take air from a atmo source instead of the pressurized intake system.
With megasquirt will the idle valve ever truly close with proper settings. I was thinking about trying this but unless I can make sure it fully closes when not in use for idle than it would also become a big air leak.
With megasquirt will the idle valve ever truly close with proper settings. I was thinking about trying this but unless I can make sure it fully closes when not in use for idle than it would also become a big air leak.
#6
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If you program it correctly, yet it will close, no different than unplugging it. That is not to say that it can't leak (which would be a mechanical fault and would occur with any type of engine management), but if both sides of the valve are plumbed into the intake, the leak would be incidental.
#8
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Also the idle valve isn't the only place where air can get in. Check out the throttle blade itself too. It doesn't close 100%. There's also the throttle bypass screw. Half the race cars I see don't have IAC, but they all still start/run/drive.
#11
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I don't understand the point of the check valve in this instance.
If the air valve leaks when closed, and you're boosting boost will enter both the hose for the idle valve and the TB and all is normal.
If the air valve leaks when closed, but it's getting air from VTA, when you're boosting, boost will exhaust from the idle valve and all is bad.
If the air valve leaks when closed, and you're boosting boost will enter both the hose for the idle valve and the TB and all is normal.
If the air valve leaks when closed, but it's getting air from VTA, when you're boosting, boost will exhaust from the idle valve and all is bad.
#13
If you program it correctly, yet it will close, no different than unplugging it. That is not to say that it can't leak (which would be a mechanical fault and would occur with any type of engine management), but if both sides of the valve are plumbed into the intake, the leak would be incidental.
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