[Irace86.2.0]

Originally Posted by Ultramaroon

There's enough info here for a first-pass discussion. I argue that:

• the bank-2 head tap is upstream of the factory pressure tap.
• the front main tap is the very next spot downstream.
• head loss in that short distance along the timing cover is negligible.

Unless that o-ring between the cover and block is blown out, it would be difficult to measure the difference. I am going out now to do this test.

GENERAL; 2013 MY FR-S [03/2012 - �������]
SYSTEM DIAGRAM; 2013 MY FR-S [03/2012 - �������]
DETAILS; 2013 MY FR-S [03/2012 - �������]

Excellent find sir!


Doesn't the system diagram seem off?

I don't know about you, but it looks to me like the oil goes from the oil pump to the oil filter then part of it goes to the left/driver's side of the motor (camshaft journals) then the rest goes to the middle then it branches again, right? Then part of the oil goes to the crank area and the other part goes to the right/passenger's side of the motor (again, camshaft journals). Is that what you see? I see a return line from the right; I see a pickup tube; I don't see a return line from the left, so maybe they left it off the diagram. What do you think?



Also, when looking at the picture bellow of the cover, it seems like there is three outlets and one inlet. One to the right and left and one to the middle with a single return. Supporting my point, it also seems like the oil is diverted after the filter to the left/driver's side of the motor, and the rest goes to the middle, where it then diverges to the crank and right/passenger's side.



I can't tell where the stock oil pressure sensor location measures from. It looks like it is on the top return channel from the filter, meaning the channel that is returning to the center (possibly after diverting oil to the driver's side section), and I can't tell where the front/top oil galley plug is situated, but it could be after more oil has been diverted to the right/passenger's side of the motor, right? What do you think? If it has then couldn't there be a significant drop?