My understanding is that the hp gain from ECU tuning is mostly from ignition advance. Having more ignition advance on a boosted engine at high rpm will give detonation, which destroys engines. So... You need a map with ignition advance when you're not under boost to maintain good power output, throttle response and fuel mileage. Then, under boost, retard the timing to prevent detonation.
This makes tuning an ecu for boost a must.
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