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Originally Posted by Andreas83
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I actually did see that early on and I had also researched the JDM Impreza 12mm oil pump gear. Just keep in mind the FA20 already has a 12mm gear but a different profile. The FA profile reduces pressure early in the RPM range and makes it more linear and I suspect that was for efficiency at low RPM.
Now I jumped straight over that to the same gear profile but a 14mm oil pump. It helped but was no way "good" and still dropped pressure too low. We went back to the OEM oil pump, internal modifications, oil cooler, etc to get where we are today.
Now if you have a really small turbocharger that has really high torque numbers below 4k RPM we may add this type of gear profile as an option to our engine build also.