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Message: <blockquote data-quote="jswong" data-source="post: 645470" data-attributes="member: 8004">Haha.. yeah, that's true. You tune like hell also you can't increase air flow!You MUST change stuff to increase airflow. Tuning can only affect how the engine generates power via combustion, for example1) tweaking the air-fuel ratio. 12.6 for maximum power, 15.8 for maximum fuel efficiency, 14.7 for stoichometry.. AFR can be tweaked between these figures to get the desired results.2) tweaking ignition timing - how many degrees to advance the ignition, in case the air-fuel charge is not percussive enough3) tweaking the valve cycles - how many degrees overlap; when do the valves open and close with respect to piston positionThat's all tuning.More than that, it's modifications. e.g. forced induction or swapping throttle body/intake manifold to increase airflow, replaced fuel injectors for heavier fuelling, swap out ECU for totally different air/fuel maps, etc.</blockquote>

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