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From the sound of it, it sounds like the water pump speeds change together with boost. Maybe the factory system controls the water pump based on temperature only, but Dinan mapped it to increase together with boost increases.
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Remapped Water Pump Speeds. In an effort to more effectively control oil and water temperatures, which have been notably excessive even at stock boost pressures, the Dinan software actually increases water pump speeds as boost pressure increases. A much larger, more efficiently ducted oil cooler has also been developed, further improving heat exchange for lower and more consistent operating temperatures, even with the added boost pressure.
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