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Old 06-27-2011, 12:55 AM   #1
Wookie768
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Default oil pump, upgrade to 11/12mm or stick with stock 10mm

well its time to do the timing belt and im gonna replace the water pump and oil pump also, just wondering if i should stick with stock pump on stock motor
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Old 06-27-2011, 07:14 AM   #2
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My water pump was still as good as new when my 2.0 finally gave out ghost at 130K miles, with 300WHP. The bearing had absolutely no play or noise.
The stock water pump is fine.

The oil pump was 10mm on all Sti, including the JDM models, according to what I was reading. I did not verify this NASIOC info with the JDM parts catalog yet.

But the info on this forum has it that Subaru only went to a 11mm pump when the engine went to dual AVCS.
12mm pump was always aftermarket.

According to some of the vendors that make oiling system upgrades, the problem with the Subaru engines is that the oil capacity of the pan is on the smaller side and at any given time, much of the oil is not in the pan, but travelling in the engine.
By increasing the size of the pump, you would reduce the "dynamic oil level" in the pan.
You may have noticed that it takes a while with these engines to get a correct oil level reading after you stop the engine. Maybe 2 minutes or so.
That's because so much of the oil is not in the pan.

So, the 12mm should probably be associated with a larger capacity pan.
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Old 06-27-2011, 01:48 PM   #3
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alright, thanks ill stick with the 10mm
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Old 06-27-2011, 11:35 PM   #4
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Get the 11mm
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Old 06-28-2011, 04:16 PM   #5
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Quote:
Originally Posted by Vlad View Post
The oil pump was 10mm on all Sti, including the JDM models, according to what I was reading. I did not verify this NASIOC info with the JDM parts catalog yet.

But the info on this forum has it that Subaru only went to a 11mm pump when the engine went to dual AVCS.
12mm pump was always aftermarket.
ALOT of bad info... 10mm was on 04-07 sti's while in 08-11 (i believe) was/is an 11mm pump.
The 12mm was available in Japan on certain models although I'm not cetain of which one, I do know it was a factory pump...

Quote:
Originally Posted by hybrid gti 2 View Post
Get the 11mm
Whats your reasoning for this?? How can you make a recommendation and not provide info/data/or even an arguement as to why????
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Old 06-28-2011, 04:33 PM   #6
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The 04-07 Sti had single AVCS and a 10mm pump. The 08+ had double AVCS. The change in pump (11mm) coincided with the change in AVCS and is motivated by it.
There is no bad info there.
The 12 mm pump has always been offered in the Sti upgrade catalog. Sponaugle posted the list of all JDM Sti oil pumps upto 07 and none had the 12mm part number.
If you have info about a JDM Sti with 12mm oil pump, go ahead and post it, we'll see if it's bad or not.
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Old 06-28-2011, 05:59 PM   #7
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so why the 11mm pump over 10mm?
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Old 06-28-2011, 10:15 PM   #8
hybrid gti 2
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The 11mm often will work better then 10mm or 12mm. Often unless the 10 or 12 is shimmed and or pnp. Basically cosworth or something like that. There is simply to much info. You should really read it for yourself. Don't just trust what someone says unless you read it for yourself. There are so many threads with all of this already answered in great detail.

Simple answer. 11mm is the best oem oil pump for plug and play with no modification. It's all the pump you generally need when doing general moding. If you have wild power then is the time to consider a larger choice. If you want to spend more money on oil mods then a 11mm pump, consider the killer b oil pick up and sti pan.

The 12mm is an oem pump but I have no idea what years or models they came in.
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Old 06-28-2011, 11:17 PM   #9
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http://forums.nasioc.com/forums/show...1433697&page=3

You'll find there the list of pump applications as well.
Edit: I just looked up the JDM part numbers, Jeff has them right, no surprise..
So, no 12mm in any JDM '02-'07.
I'm not sure why you think it's OEM.

Last edited by Vlad; 06-28-2011 at 11:40 PM.
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Old 06-29-2011, 01:02 PM   #10
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Quote:
Originally Posted by Vlad View Post
http://forums.nasioc.com/forums/show...1433697&page=3

You'll find there the list of pump applications as well.
Edit: I just looked up the JDM part numbers, Jeff has them right, no surprise..
So, no 12mm in any JDM '02-'07.
I'm not sure why you think it's OEM.
If you wanna buy one:
http://www.flatironstuning.com/p-154...-pump-kit.aspx

and if you wamt data on all of them:
http://forums.nasioc.com/forums/show....php?t=1411649

The 12mm is a factory pump.
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Old 06-29-2011, 01:57 PM   #11
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I've read your link.
The only reference in that to the 12mm pump being used in a car is by Sponaugle, who in 2007 posts that Subaru may have used this in a dual AVCS car.
Then at a later time, in 2008, in the link that I've posted, he lists all the applications (no 12mm pump), which I have confirmed last night.
I don't know about other models, but the Impreza certainly was not dual AVCS untill model year 2008, which began being sold in late 2007.


Quote:
Originally Posted by dux10 View Post
The 12mm is a factory pump.
This is your opinion.
Stop posting it as a fact, or post the year and model of the Subaru with the 12mm pump.
This is a Subaru pump sold as a performance upgrade, for a range of WRX/Sti engines.
People's opinions posted as facts are a major cause for misinformation on the forums.

Last edited by Vlad; 06-29-2011 at 02:23 PM.
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Old 06-29-2011, 11:11 PM   #12
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I did a search. I found suggesting the 12mm pump is a modified pump, likely a 10mm with different pump internals. Yet there is no info to support this. Another site said it was from a 2.5 jdm engine. So it might be the truth it's not made by subaru. Yet I remember reading back when I first got my car there was an 10mm and 12mm pumps for upgrades.
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Old 08-02-2019, 10:34 AM   #13
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Super old thread revival but in case anyone googles looking for info, the 12mm pump came OEM in the EJ208 twin turbo legacy engines as well as the EJ20X/EJ20Y DAVCS.

FYI

(I know it's a super old thread, but it's the second result in a Google search for me)

I'm sure people know by now, just figured I'd try to help anyone that may stumble across this.

Last edited by 2004-STi; 08-02-2019 at 10:44 AM.
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Old 04-22-2020, 03:39 PM   #14
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thanks! i was one of those that made it here via Google Search.
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Old 03-20-2021, 07:35 PM   #15
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ugh, I can't start my own posts yet and this one seems to be the closest to what I'm looking for.... so, sorry for the necro

I've got a Bugeye with the original EJ205 and I was thinking maybe I should replace the oil pump and timing belt/pulleys since I have to replace my oil pan. Everything I read says stick with the factory oil pump for my engine, it's a 10mm also right?
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Old 03-21-2021, 11:07 AM   #16
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Quote:
Originally Posted by Cscribble View Post
ugh, I can't start my own posts yet and this one seems to be the closest to what I'm looking for.... so, sorry for the necro

I've got a Bugeye with the original EJ205 and I was thinking maybe I should replace the oil pump and timing belt/pulleys since I have to replace my oil pan. Everything I read says stick with the factory oil pump for my engine, it's a 10mm also right?
10mm is fine on the 205
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Old 03-24-2021, 01:52 AM   #17
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Quote:
Originally Posted by Cscribble View Post
ugh, I can't start my own posts yet and this one seems to be the closest to what I'm looking for.... so, sorry for the necro

I've got a Bugeye with the original EJ205 and I was thinking maybe I should replace the oil pump and timing belt/pulleys since I have to replace my oil pan. Everything I read says stick with the factory oil pump for my engine, it's a 10mm also right?
I'm using now 11mm oil pump
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Old 03-25-2021, 08:12 PM   #18
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Quote:
Originally Posted by Cscribble View Post
ugh, I can't start my own posts yet and this one seems to be the closest to what I'm looking for.... so, sorry for the necro

I've got a Bugeye with the original EJ205 and I was thinking maybe I should replace the oil pump and timing belt/pulleys since I have to replace my oil pan. Everything I read says stick with the factory oil pump for my engine, it's a 10mm also right?
Your oil pump and Timing belt(and running gear) don't have much to do with your oil pan, but if you're feeling energetic, why not! Should definitely be done if you don't know the last time all that stuff was replaced.

Replacing the oil pan with a 2.5 oil pan? Not a bad idea if you ever plan on doing an equal length exhaust manifold down the road. Oil pick-up/baffle/dipstick/tube all go with the oil pan you use as well.

And yes, as was mentioned, the stock 10mm pump on the ej205 is the same one on all GD STi's. RA-R, RASC, S202, S203, you name it. All got by just fine on the stock 10mm pump. Built motors could be a different story however.
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Old 03-25-2021, 08:50 PM   #19
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I haven't looked into the process of changing the oil pump on a Subaru quite yet but generally speaking on some cars you have to remove the oil pan to get the oil pump off. Plan for the worst and such lol

I have changed the timing belt and associated parts with that but it's been a few years. May as well do it again, why not replace the oil pump too. I do have to replace the pan though so if I'm in the vicinity why not hit it all with one foul swoop.
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