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The car has 2 coolant circuits. The small one, is connected all the time to the engine block and to the heater core. The large circuit, is opened by the thermostat only when the coolant from the small circuit heats up too much. The vaporizer is connected on the small circuit. So there isn't much room for improvement there.
I do get the impression that a CAI would help. The outside temperature dropped a little these days and the engine seems to be running a little better.
Also, there is a dramatic improvement when I start with the engine already warmed up.
I have to investigate a series of mods to keep the engine warm for a longer time and to make it warm-up faster.
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