JonMc

iTrader: (51)

I'm going to be ramping the power of my WRX up to about 340-350bhp after fitting a new turbo, pinks, remap etc. Before I do that I'm going to change the cambelt and while I am at it was wondering whether it's worth upgrading the oil pump.

I am going to replace the modine with a thermostatically controlled oil cooler but I am not sure what pump to go for and what the differences are. I've seen modded 10mm, 11mm and 12mm.

I know 10mm is standard and the mod makes it more reliable but does it flow more oil and maintain better pressure or should I go for a larger pump?

Steve Whitehorn

iTrader: (13)

How big is the oil cooler?
Have you dual or single AVCS heads?

The size of oil pump all depends on how much oil needs to be pushed round the engine.

If you have AVCS heads a massive oil cooler the size of a radiator ect running a billion hp ...then you would need a 12mm
A 12mm on a lesser set up can cause more harm than good.

My gut feel from what you are saying is stick with a 10mm

(After careful consideration I run an 11mm on my current set up)

jura11

iTrader: (7)

Hi John

Personally I wouldn't upgrade to modified oil pump,we run on our wagon at 350bhp standard size oil pump,we run oil cooler for gearbox(that time we run 4EAT-autobox) and for engine too we run oil cooler without the issue,although JDM WRX comes with AVCS heads still we are been OK

On 2.1 we run 10mm modified oil pump(on modified oil pump is only modified pressure relief valve I think) and we are been OK at 490bhp

On 2.35L we are run 11mm Oil pump which has been OK too

As above Steve said,depends on setup,but I would stick with 10mm oil pump

Hope this helps

Thanks,Jura

JonMc

iTrader: (51)

It's a 19 row mocal cooler with standard WRX (non-AVCS) heads. Is it worth replacing the pump to get the pressure relief valve modded one or are failures quite uncommon - my oil pressures seems to be good although the temps are a little high for my liking often knocking on 100 degrees hence the reason for the cooler and the question about whether to mod the pump at the same time...

AS Performance

iTrader: (4)

failures aren't very common and for your spec the largest i would suggest is 10mm (std or modded) - they flow more than enough oil at good pressure for what required

as for makes then i will only use/supply RCM modded ones as they are good value for money and actually have some work done/parts upgraded

JonMc

iTrader: (51)

Cheers Alyn, I'm presuming that's the one you have quoted me for and does that include the gaskets/seals?

AS Performance

iTrader: (4)

there is no seal as such as they use the likes of Threebond on the block/pump face but yes with a crank seal......

alessio

iTrader: (3)

There's also that little o-ring that you should change

RSR Automotive

We can supply the standard Genuine Subaru 10mm at £169.00.

Or the RCM modified 10mm at £227.50.

JonMc

iTrader: (51)

That's quite pricey I'm afraid

kevo10

And check and tighten the screws ,if needed, n the rear of the pump. If they work loose , oil pressure will drop

gazzawrx

iTrader: (11)

You can get both of them from import car parts for £50 cheaper.

the shreksta

iTrader: (20)

alyn how much are the modified 12mm pumps please?

AS Performance

iTrader: (4)

pricing is best dealt with individually for specific builds direct with the office

not sure of you spec but pretty sure you will NOT require a 12mm pump - biggest is not best

the shreksta

iTrader: (20)

Built 2.5/2.0 avcs heads/gt30/top mount Hyper flow oil cooler

jura11

iTrader: (7)

As above you don't need 12mm oil pump,11mm should be enough for yours needs,we are run OE 2.5L 11mm oil pump on 2.35L there

Thanks,Jura