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Old 09-04-2008, 10:21 AM   #1
fastnoypi
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Default waterpump comparisons

i'm planning a timing belt replacement and want to do my waterpump while everything is out.

Has anyone physically compared wrx waterpumps and STi waterpumps? If so, please mention which years. Pics would be great if available.
I have heard rumors about impeller design differences, but would like to confirm. It will be going on a V7 ej207.
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Old 09-04-2008, 05:22 PM   #2
sense of nature
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Impeller is larger on the 257 motor I verified
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Old 09-04-2008, 05:36 PM   #3
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thanks man, then thats what im going with.
i just found the part number for reference on the 257.
21111AA240
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Old 10-01-2008, 12:30 PM   #4
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Bumping this back up, "larger" how? Is it a larger diameter, or is the impeller thicker? Just curious...

Pat Olsen

Last edited by Patrick Olsen; 05-25-2016 at 10:14 AM. Reason: Puppy to small dog
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Old 10-01-2008, 05:13 PM   #5
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As far as the US spec car's go, they actually use the same water pump.

The early WRX's (02 - 03) use part # 21111AA026

Then starting in 2004 Up, all the WRX's and STI's use part # 21111AA240.

The difference is that in 2004 the WRX's got an oil cooler as did the STI's.

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Old 10-01-2008, 05:26 PM   #6
sense of nature
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Quote:
Originally Posted by FlatironsTuning.com View Post
As far as the US spec car's go, they actually use the same water pump.

The early WRX's (02 - 03) use part # 21111AA026

Then starting in 2004 Up, all the WRX's and STI's use part # 21111AA240.

The difference is that in 2004 the WRX's got an oil cooler as did the STI's.

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My 02 wrx (Pro date of 02/02) has a stock oil cooler ? not sure what u mean 2004 "got an oil cooler "?
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Old 10-01-2008, 05:30 PM   #7
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Old 10-01-2008, 07:14 PM   #8
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Quote:
Originally Posted by sense of nature View Post
My 02 wrx (Pro date of 02/02) has a stock oil cooler ? not sure what u mean 2004 "got an oil cooler "?
Well, I just looked at an 03, and sure enough, there is an oil cooler on there, but it isn't until the 04's that the Subaru catalogue specifies that water pump is for a car with an oil cooler... I suppose that doesn't mean that the 02-03's don't have one (obviously).

Regardless, from 04 on, the WRX and STI use the same water pump (and oil pump for that matter), at least according to Subaru's catalogue.

Up-Date:

So, with a little more digging, it looks like all USDM WRX's did have the oil cooler, but the 2002 - 2003 WRX's have a different pump from 2004 + WRX/STI's (though the housing, and inlets/outlet's are identical). The two obvious differences are the impeller design (pictured below), and it looks like the propeller shaft is a larger diameter on the later pump (the 240) than it is on the early pump ( the 026).



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Last edited by FlatironsTuning.com; 10-02-2008 at 11:41 AM.
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Old 10-21-2014, 06:28 PM   #9
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Default Water pump ending in 240

Question for flat irons tuning.. Does this mean that the 240 water pump can be used in 02 wrx? Would it be an upgrade? Thanks..
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Old 10-21-2014, 07:16 PM   #10
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Yes, it can be used. They are sold as an upgrade for the 205.
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Old 10-21-2014, 08:11 PM   #11
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Interesting. Just looking at the impellers (6 years after I last posted in this thread) I would think the 240 was the inferior pump. In small-block-Ford-land, the cheap water pumps use that stamped, angled vane style impeller, while the better pumps use an enclosed, curved vane impeller.
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Old 10-21-2014, 09:36 PM   #12
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Thanks, for real..
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Old 10-21-2014, 09:51 PM   #13
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Pat is right and the 240 in inferior to the cast impeller. This has been covered many many times. Basically subaru was looking to ways to cheap out. This was one of them. The pumps are know to flow less at higher rpm and even result in cavitation. The inlet from the lower radiator hose to the thermostat isnt helping either though.

Asian makes the pumps.

I will only use the cast impeller pump on all the performance oriented builds. Guys wifes auto turbo baja I built a motor for and wanted me to tune it on 87oct got a stamped pump.
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Old 05-22-2016, 09:28 PM   #14
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Quote:
Originally Posted by rexworx View Post

Asian makes the pumps.
It's Aisin, not Asian.
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Old 05-24-2016, 03:21 PM   #15
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Woops LOL Thank you...
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Old 05-24-2016, 05:38 PM   #16
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Quote:
Originally Posted by rexworx View Post
Pat is right and the 240 in inferior to the cast impeller.
As long as we're necro-bumping this thread...

All the newer genuine Subaru pumps are stamped - LIC makes a very good argument why you should be using Genuine Subaru stamped pumps rather than aftermarket cast pieces, here:

http://www.licmotorsports.com/blog/2...ne-water-pumps
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Old 05-25-2016, 09:38 AM   #17
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I ordered an "026" pump from the dealer last year which has the cast impeller. Running it on my built EJ257.

LIC seems to be addressing the aftermarket cast impeller pumps, I wonder if the Genuine Subaru cast impeller pumps are any different...
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Old 05-25-2016, 12:12 PM   #18
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Quote:
Originally Posted by STiSomeday View Post
LIC seems to be addressing the aftermarket cast impeller pumps, I wonder if the Genuine Subaru cast impeller pumps are any different...
My point was, I don't think Subaru makes any (cast wheel models), anymore. Could be totally wrong on this... but FHI generally makes one revision of a part, that's it - previous versions are almost always discontinued though super-cession on the p/n. The part numbers for parts like this are strange, as they are a high enough volume part that they are farmed out to aftermarket companies.

The other thing to keep in mind is that the number of external ports on the water pump is going to be far more important on a build than the wheel manufacturing method. If you need a two-port model due to using an air-cooled oil radiator, it would be silly to source a three-port model and block a port (potential leak) just to get a cast wheel.
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Old 05-25-2016, 02:30 PM   #19
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Quote:
Originally Posted by mrsaturn7085 View Post
If you need a two-port model due to using an air-cooled oil radiator, it would be silly to source a three-port model and block a port (potential leak) just to get a cast wheel.
Right, that makes sense. Mine could have been NOS or it could have been aftermarket in a Subaru box.

I need a 3 port model so it worked out to use the 026 pump. I'm just wondering if I should replace it with a stamped impeller Genuine Subaru pump, as my engine is out right now and the timing belt is off. It would be an easy time to make the switch if it's warranted.

Last edited by STiSomeday; 05-26-2016 at 10:26 AM.
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Old 10-16-2016, 03:25 PM   #20
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So can anyone say what the Aisin part number is for the 240 pump? If they make the same pump, Aisin sells for about 40 dollars less than the subaru one.
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Old 07-20-2018, 09:40 AM   #21
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Does anybody know the difference between these water pumps ?

21111AA430 vs 21111AA026 vs 21111AA240
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Old 05-19-2020, 09:07 PM   #22
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This topic is super confusing! With no actual data, no one can say whether the cast enclosed impeller design #21111AA026 is higher flow or generally higher performance than the AA240 stamped open impeller for the 2.5 era... Conceptually, the cast impeller just looks way more efficient at moving fluids but another subjective opinion doesn't help. I'll do a bit more poking around but have hit the wall!
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Old 05-19-2020, 09:47 PM   #23
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In my search for practical testing between the cast & stamped impellers - found some big claims here:
https://www.iwsti.com/threads/new-pe...leased.222692/
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Old 05-21-2020, 04:14 PM   #24
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Definitely go for the vane style pump, they are much more efficient at moving the coolant around. I put an old model legacy pump on my engine build and it's been great so far. Even with my wastegate plumbed into the cooling I hardly ever see temps get above 200 on a normal ~70* day.
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Old 05-21-2020, 08:29 PM   #25
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Thanks for the practical beta! I know this debate goes back to 2011 at least.. and still there were no definitive answers. I’m sold on the cast turbine tho, cheers***128077;***127996;

Quote:
Originally Posted by ThinWRX View Post
Definitely go for the vane style pump, they are much more efficient at moving the coolant around. I put an old model legacy pump on my engine build and it's been great so far. Even with my wastegate plumbed into the cooling I hardly ever see temps get above 200 on a normal ~70* day.
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