How many GPM from the water pump?

[Gilles]

Originally Posted by itsnotanova

I'm looking at going to an electric water pump on my rallycross boxster. Anyone know how many gallons per minute the factory water pump puts out?

Woody, too much flow would cause the engine to overheat..

[Anker]

Originally Posted by Gilles

Woody, too much flow would cause the engine to overheat..

That doesn't make any sense. What counts is how many calories per unit of time are dissipated through the radiators. Too little flow is a problem because the radiators will become cool and become inefficient in dissipating heat. High flow has the opposite effect. Warmer radiators that dissipate heat efficiently.

[itsnotanova]

Originally Posted by Anker

That doesn't make any sense. What counts is how many calories per unit of time are dissipated through the radiators. Too little flow is a problem because the radiators will become cool and become inefficient in dissipating heat. High flow has the opposite effect. Warmer radiators that dissipate heat efficiently.

It's been a rough week for cooling systems. Both my wife's subaru and my rallycross Subaru had sticking thermostats. Out of cheapness and lazyness, I removed the thermostats from both subarus and they both run cooler without one.

[Gilles]

th

Originally Posted by Anker

That doesn't make any sense. What counts is how many calories per unit of time are dissipated through the radiators. Too little flow is a problem because the radiators will become cool and become inefficient in dissipating heat. High flow has the opposite effect. Warmer radiators that dissipate heat efficiently.

Anker, many years ago ( Fiat racing days) FAZA had to put a restrictor on the output hose of the head, as the water was flowing too fast to allow a proper heat exchange from the head to the water.

By slowing the water flow it allowed a proper heat exchange...

[itsnotanova]

Originally Posted by Gilles

Woody, too much flow would cause the engine to overheat..

I'm not looking to flow a lot more than the factory pump. That's why I'm curious about the factory gpm. There are a few reasons I'm considering going electric. First is cost. a factory water pump is close to $300. From a quick search, the top of the line electric water pumps are going for almost half that much. Some electric water pumps I looked at are only $40! Second is I want more control over flow of coolant. I like the ability to keep water flowing even with the engine off. The type of racing I do doesn't give enough time to cool down. Another benefit will be a small gain in overall horsepower because the engine won't be turning a water pump.