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Old 03-28-2006, 10:54 PM   #1
HamFist
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Member#: 2112
Join Date: Aug 2000
Chapter/Region: MWSOC
Vehicle:
2000 Impreza 2.5RS
BRP

Default STI water and oil pump swap?

Can I use STI water and oil pumps in my N/A RS?
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Old 03-29-2006, 08:56 AM   #2
n2xlr8n
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Member#: 18960
Join Date: May 2002
Chapter/Region: South East
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02 WRX MBP
It lives! ; )

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I'd bet Matt Monson would know, and he's helpful.

S.
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Old 03-29-2006, 07:41 PM   #3
ballitch
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98 cam'd EJ251
Wrx Tranny,slowr than ish

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yes you can, but they dont flow much more than stock regular EJ25 or EJ22 pumps, being as how they are all the SAME!!!

~Josh~
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Old 03-30-2006, 12:55 AM   #4
HamFist
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I never trust an STI part to just LOOK the same as another stock counterpart. They meant for those to be run harder, and upgrading to those parts seem like a good idea. For example, are the radiators different, too?
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Old 03-30-2006, 08:27 AM   #5
BensonRST
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1999 RS-T
Custom Charcoal

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i 've heard that the oil pump for the ej22t is the highest flowing, because it has oil squirters. never have confirmed it though. anyone know?
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Old 04-04-2006, 10:27 AM   #6
AWDrivin
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99 2.5RS
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bump... I'm looking for some technical info on this as well...
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Old 04-04-2006, 11:29 AM   #7
Matt Monson
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'73 914 and 2012 BRZ

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Oil pump yes, water pump, no. The STi oil pump is suposedly a higher pressure unit, similar to the old Ej22T pumps.

As far as the water pump, not only is the outlet to the radiator in the wrong place, but it has 2 extra return fittings, one for the overflow tank and one for the oil cooler. You could cap them, but why bother. I have never heard anything about it being a better flowing unit. If you want more cooling, get an additional heat exchanger and plumb it into the mix. It's about more volume of coolant, not more volume of flow...
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Old 04-04-2006, 11:32 AM   #8
AWDrivin
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Thanks Matt. What I was wondering about the water pump is if the return fittings could be used to plumb coolant lines to the turbo instead of cutting into the RS heater lines.
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Old 04-04-2006, 11:37 AM   #9
Matt Monson
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'73 914 and 2012 BRZ

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You can plumb returns to the water pump, but not pressure fed coolant out to the turbo...
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Old 04-04-2006, 11:44 AM   #10
AWDrivin
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gotcha, thanks.
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Old 04-04-2006, 11:09 PM   #11
Drac9
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Hybrid Rally Blue Pearl

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Good job Matt, 100% correct
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