Originally Posted by Fabrik8

Is that VW waterpump electic? You really don't need much flow, just enough to do what you need. If you have too much flow, you end up circulating the water through the cores before it has had the chance to effectively remove or give off heat (depending on what core it's in). It's the same for the charge cooler and the radiator in this system, if they flow too much water, they won't be very efficient.