Oil return plug - turbo car

[2eighTZ4me]

I've been losing oil pressure at the track once the car gets warmed up. I checked my Oberg thinking it was clogged and returning oil through the bypass ball valve in the oil filter area on the block. It was not. I was speaking to a knowledgable L series guy and he stated that the turbo cars had a plug where that ball/spring unit is to force the oil through the cooler and not let it bypass back into the block. I have the plug - 11022-69800, and was wondering if anyone else has done this.

 

In particular - how do you get that existing ball/spring/sleeve unit out of the block cleanly - WITH the motor in the car....seal puller?

 

I have the Wolf Creek adjustable oil pump spring and it's cranked pretty far down. Great pressure when just tooling about, but under serious load after 5 or so laps - pressure gradually drops. I have to think that by spinning the motor that fast for a long while - AND having the dual sandwich element in the Oberg, that the motor just simply cannot push that much oil through a 115 and a 60 micron screen and it's bypassing through that check valve back into the block. Another telltale is that my oil temp sender is inline just past my Oberg, and it drops to 0 - telling me that hot oil is not getting past the Oberg.

 

Ideas???

[NewZed]

The 78 FSM says to pry it out with a screwdriver (EL-4).  For some reason the later ZX FSM's take that direction out, or moved it.