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Upgrade Oil Pump to 11mm (08 STI design) - Worth It?


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I can't really give you a yes/no answer(I'm not aware of any inherent problems with that pump itself); it just basically makes use of the "excess" oil it's pumping. Assuming you use something like C&R's bypass setup(adjustable), you may be able to fine-tune the oil system pressure so the pressure relief valve isn't being overworked.

 

the type of people that would properly incorporate a oil pump bypass, wouldn't likely be the ones with an un-needed 11mm pump IMO.

It would be a whole lot easier and cost effective to just pull the timing components, and replace the pump with the proper sized one.

 

my view on it is, just use the factory pump, until your at a point where you can make the jump to a true dry sump system, whic hopens up a lot more possibility, and makes the EJ motor much more useful with a increased rev range

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