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Old 06-28-2020, 02:00 AM   #1
Mauricemonge
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Member#: 425415
Join Date: Jul 2015
Chapter/Region: BAIC
Location: San Francisco
Vehicle:
66 Bug with ej20g

Default Stock water pump cfm numbers?

Not sure if this is the best place to ask. But would anybody know what kind of cfm numbers a water pump puts out?

I have a mid engine - front radiator setup, and I’ve gotten a little warm (and overheated) at slower speeds, especially after a pull. I’ve since upgraded my fan from 1150cfm to 1850cfm, but now I’m worried I may need an in-line water pump to help with water flow at lower engine rpm’s and stoplights. It’s hard to test locally because Sam Francisco never gets warm, but I hope to hit some track days eventually. I’m wondering how efficient the water pump is at lower rpm, and if it’s worth my time to add the pump to get the water flowing better over the longer distance.


Thanks
Maurice
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Old 06-28-2020, 08:48 AM   #2
KillerBMotorsport
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Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

You're going to find marginal differences with the OEM pumps. What you really need to do is run several electric pump or one big expensive one. This is what is done on the factory rally cars with the rear radiator setups.

The factory pump has enough to push a small loop, but putting the radiator on the opposite end of the car is just too far beyond it's ideal operational window and these engines move a LOT of coolant, so that needs to be maintained to keep proper flow and system pressure.

You might get away with running a booster pump like some Porsche setups, but that may be more of a band-aid.
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Old 06-28-2020, 12:22 PM   #3
Mauricemonge
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Join Date: Jul 2015
Chapter/Region: BAIC
Location: San Francisco
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66 Bug with ej20g

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I actually have a high output meziere pump for a v8 engine running my air to water intercooler. It’s completely overkill to run a $600 pump, but it’s what I got with the used intercooler kit. I’ll plan on running that. Should I remove the impeller on the Subaru engine’s water pump, or just run the electric with it?
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