Whats the Differance Between A STI and WRX OIL PUMP!

javastiwagon24 · 07-30-2007, 06:21 PM

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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Kosmic · 07-31-2007, 03:13 AM

None. They are both 10mm oil pump. You may double check on this info tho.

ovedrivex · 07-31-2007, 06:11 AM

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

javastiwagon24 · 07-31-2007, 11:03 AM

what about the water pump????

LeoNYC · 07-31-2007, 11:50 AM

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).

ovedrivex · 07-31-2007, 02:26 PM

Quote:

Originally Posted by javastiwagon24

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!!!

MRF582 · 08-14-2007, 11:47 AM

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.

Jeremy@Cobb · 08-14-2007, 12:36 PM

Quote:

Originally Posted by ovedrivex

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.

edo2000 · 08-14-2007, 07:21 PM

Quote:

Originally Posted by Jeremy@Cobb

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.

Jeremy@Cobb · 08-14-2007, 07:51 PM

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.

cdigerlando · 08-14-2007, 08:04 PM

Does anyone know if the pump curves are different? Anyone done any flow testing?

Kosmic · 08-14-2007, 09:26 PM

Quote:

Originally Posted by Jeremy@Cobb

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.

kay95 · 08-16-2007, 08:36 PM

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.

07-30-2007, 06:21 PM	#1
javastiwagon24 Scooby Specialist Member#: 144372 Join Date: Mar 2007 Chapter/Region: MWSOC Location: white boy in Mexisha Vehicle: 0407 STIwag & 01 STI Rotated!Widebodied!RaLLY	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. * Registered users of the site do not see these ads.

07-31-2007, 06:11 AM	#3
ovedrivex * Banned * Member#: 116774 Join Date: Jun 2006 Chapter/Region: TXIC Location: Tropioca.com Vehicle: 1997 Project GC8	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.

08-14-2007, 08:04 PM	#11
cdigerlando Scooby Specialist Member#: 6070 Join Date: Apr 2001 Chapter/Region: South East Location: Longwood, FL Vehicle: 9202 SVX, WRX 92 Sil/Blk, 02 Sil	Flow Does anyone know if the pump curves are different? Anyone done any flow testing?

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07-31-2007, 03:13 AM	#2
Kosmic Scooby Specialist Member#: 99140 Join Date: Oct 2005 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: GD Racing chassis Slowly in construction	None. They are both 10mm oil pump. You may double check on this info tho.

07-31-2007, 11:03 AM	#4
javastiwagon24 Scooby Specialist Member#: 144372 Join Date: Mar 2007 Chapter/Region: MWSOC Location: white boy in Mexisha Vehicle: 0407 STIwag & 01 STI Rotated!Widebodied!RaLLY	what about the water pump????

07-31-2007, 11:50 AM	#5
LeoNYC Scooby Newbie Member#: 106583 Join Date: Feb 2006 Chapter/Region: Tri-State Location: Queens, NYC Vehicle: 1999 2.5RSTi Black	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).

08-14-2007, 11:47 AM	#7
MRF582 Scooby Guru Member#: 48219 Join Date: Nov 2003 Chapter/Region: MAIC Location: Pittsburgh, PA Vehicle: . Always drive the race line .	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.

08-14-2007, 07:51 PM	#10
Jeremy@Cobb Scooby Newbie Member#: 106514 Join Date: Feb 2006	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.

08-16-2007, 08:36 PM	#13
kay95 Scooby Newbie Member#: 45494 Join Date: Oct 2003 Location: glen rock, pa Vehicle: 95 impreza L awd green	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.