Quote:
Originally Posted by AdrianG
No, there is no oil pressure sensor, just an on/off style sensor to make sure there IS oil pressure. It doesn't measure how much pressure there is, you'd have to add your own sensor.
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And that's part of the problem we have no oil presuure logs for the FA20.
I found the spec on the filter, its 23 psi whichi is high, so this is probably pretty high volume pump. The next question is what is the oil pressure in the torque dip. Possibly the bypass valve is fluttering.
I doubt this is the issue by 4-5k rpm the pump shouldn't be held back by the bypass valve, but it would be interesting to know if the oil pressure in this rpm range has any affect on the noise.
It would also be interesting to know if this isn't a high flow oil pump like most Subaru's, or if they cheapened it out with a different part number. Anyone have parts digrams that can compare the FA20 oil pump to The FA20T?