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Old 07-30-2007, 06:21 PM   #1
javastiwagon24
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Default Whats the Differance Between A STI and WRX OIL PUMP!

Im doing a hybrid build and after all the new parts funds are getting slim, I have gone fully forged with race bearing and other crap! I would like to know if you guys know if the pumps are different or the same, any help would be great if you guys have a oil pump for sale let me know thanks again.
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Old 07-31-2007, 03:13 AM   #2
Kosmic
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None. They are both 10mm oil pump. You may double check on this info tho.
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Old 07-31-2007, 06:11 AM   #3
ovedrivex
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when you order from the dealer the ej205 oil pump is the same part number as the ej257.
-edit: here is more proof they are the same if you dont want to just take my word for it


Last edited by ovedrivex; 07-31-2007 at 06:26 AM.
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Old 07-31-2007, 11:03 AM   #4
javastiwagon24
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what about the water pump????
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Old 07-31-2007, 11:50 AM   #5
LeoNYC
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if you are looking for an upgraded pump check this out:

http://forums.nasioc.com/forums/show....php?t=1263180

its a 12mm as opposed to a 10mm (20% more flow).
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Old 07-31-2007, 02:26 PM   #6
ovedrivex
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Quote:
Originally Posted by javastiwagon24 View Post
what about the water pump????
the same. even the cam gears are the same. only difference between the two blocks are the blocks... thats why i lubbawubba subaru engines. people think honda is the universal car. its only cause they know nothing about subaru!!!
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Old 08-14-2007, 11:47 AM   #7
MRF582
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i've looked at 2 WRX oil pumps. they had one shim under the pressure relief spring each. the STi oil pump came with 2 shims under the pressure relief spring.
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Old 08-14-2007, 12:36 PM   #8
Jeremy@Cobb
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Quote:
Originally Posted by ovedrivex View Post
the same. even the cam gears are the same. only difference between the two blocks are the blocks... thats why i lubbawubba subaru engines. people think honda is the universal car. its only cause they know nothing about subaru!!!

Water pumps are actually different.
The WRX pump uses the same impeller as the 2005 RS
The USDM 2.5L Turbos (EJ255 & EJ257) use the same water pump as the EJ207 engines, equivelant to the JDM Spec C water pump.
USDM STI on the left USDM WRX or RS on the right.


- J.

Last edited by Jeremy@Cobb; 08-14-2007 at 03:55 PM.
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Old 08-14-2007, 07:21 PM   #9
edo2000
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Quote:
Originally Posted by Jeremy@Cobb View Post
Water pumps are actually different.
The WRX pump uses the same impeller as the 2005 RS
The USDM 2.5L Turbos (EJ255 & EJ257) use the same water pump as the EJ207 engines, equivelant to the JDM Spec C water pump.
USDM STI on the left USDM WRX or RS on the right.
- J.
So, are the connections all the same on the EJ257 water pump? Does any plumbing have to change to use one? Thanks.
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Old 08-14-2007, 07:51 PM   #10
Jeremy@Cobb
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If you are upgrading a NA engine you will have to plug a water output from the pump.
If you have a EJ20 WRX and want to go to the USDM STI pump this is a direct bolt on replacement.
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Old 08-14-2007, 08:04 PM   #11
cdigerlando
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Default Flow

Does anyone know if the pump curves are different? Anyone done any flow testing?
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Old 08-14-2007, 09:26 PM   #12
Kosmic
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Quote:
Originally Posted by Jeremy@Cobb View Post
If you are upgrading a NA engine you will have to plug a water output from the pump.
If you have a EJ20 WRX and want to go to the USDM STI pump this is a direct bolt on replacement.
Good info, thx J.
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Old 08-16-2007, 08:36 PM   #13
kay95
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I have gotten replacement water pumps with both the stamped and cast impellers. Now this was for a 95 L so I think it might just be a case of different manufacturers. Do they have different PN? That would be interesting.
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