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Old 04-29-2002, 02:10 AM   #1
DJIMPREZA
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Member#: 1199
Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

Default EJ Turbo VS EJ non Turbo water pump

2.5 guys with legacy turbo blocks also may show up here...

There is a difference in the cooling tubes and overall coolant lines betwen these two blocks, the wrx and the 2.5,due to the turbo pressence and design.

Are there any benefits in flow or cooling capabilities betwen the wrx water pump and the rs one?

The wrx pump has three tiny hose barbs besides the big one for radiator, one is for the factory oil cooler, one from heater, and the last one from the radiator tank (the rad tank is the one above the left side of the intake manifold)

For those running legacy blocks on 2.5 rs, what do you do with the water pump hose barb that is meant for the wrx radiator tank? well, maybe I am wrong are you are keeping your stock water pump when buying the 2.2 short block, am I wrong?

And if you were adding the wrx radiator, radiator tank, and coolant lines, but, keeping the 2.5 (N/A) water pump, into your RS what would you do with the remaining hose barb from the rad tank? tap it? you will T- fit a coolant line into the throttle bodie or heater lines to keep flow??

Please help, I am about to order the wrx water pump to solve what will I do with the hose barb that I got in my rad tank (I repeat the hose barb is at the bottom) with no use for my N/A block/water pump.

Thanks for the advance, I swear I will bump up this theard untill I get a clear answer
I have gone to far with my project, and I know this couls be done easily, don`t make do a terrible mistake, I got the wrx diagrams and I think I could T fit the line to any of the incoming coolant lines to water pump (heater or TB) but if so, I was thinking) why the wrx water pump divides the entries???
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Old 04-29-2002, 10:48 AM   #2
Graham
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Member#: 11931
Join Date: Nov 2001
Location: Winter Park, FL/ SMU @ Dallas,
Vehicle:
2001 2.5 RS Turbo
257/FMIC/T3-T04S

Default

Well, I'm not too familiar with the WRX waterpump design, but I have fit a Legacy Turbo waterpump onto my 2.5L block (they might be the same). There are three outlets on my waterpump, the largest one coming from (or going to) my radiator on the very bottom of the pump, then the middle line that is coming or going to somewhere in the block, and then the top most outlet. The top one is blocked off, as its purpose was to feed the turbo. We felt that it would be better to get the coolant from the heater-core lines rather than having to run a line all the way from the pump to the turbo.


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Old 04-29-2002, 02:13 PM   #3
Fitz
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Location: New Boston, NH
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'07 335xi, '07 ZX6R
SV650 Race Bike

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I'm using the 2.5L water pump on my 2.2T motor. The bolt pattern/ coolant line routing is identical to the original 2.5L.

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Old 04-29-2002, 04:36 PM   #4
DJIMPREZA
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Location: Caracas, Venezuela
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1994 Supra+1K, 22b
alike, 07STI

Default Graham

I think that the hose barb left in the water pump is not for feed the turbo directly!!, if you carefully look at the turbo coolant line Inlet, you`ll see that it comes from radiator tank, and if I am not wrong, the coolant return line from turbo goes to left head directly, I still think that the extra hose barb of the water pump goes to the bottom hose barb radiator tank!

Please, someone with a wrx, tell us the true!!

The water pump is very cheap new, I found it for 50$!

Thanks guys
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