I've been working with a bud's turbo 2.0 talon with oil pressure problem.

The oil pressure holds steady up to 3000 RPM then starts dropping until about 5000 when it goes into the red zone.
Uphill, downhill or sidways doesn't matter unless its revved over three grand then it's low pressure.

Lots of oil, filter not clogged.

I'm thinking relief valve but cannot figure how it would cause those symptoms, good pressure to three then a steady fall off until the RPMs are brought back down to three again.
The lifters aren't ticking so no air should be in the system (common prob with these) and the power seems fine except I am afraid to really stomp it to the redline with such dinky oil pressure past 4000.

Two days ago the talon ran fine, it started doing this halfway through a twenty minute trip. No loose connections on the sender and no loose oil on the engine.
Could a broken relief spring hold to a set pressure, open, and then not be able to close again until the volume dropped? I'm reaching here.
I just want to dismantle as little of the engine as possible this weekend, if it's not a Fiero it's not fun,it becomes work. Yuck.

I had a Turbo Talon for all of 1 month and already had oil problems. Good luck.

is there a timing belt connected to the oil pump/distributor? my tbird has that setup.

I had one lady that wanted me to do her timing belt, i went to trak auto to look at the manual, and i said, i cant take that job, it was during the winter, and i had no room in the garage, and the car has like 2 or 3 timing belts and the steps to take it off was A LOT.

Dang! Read the facory manual, THREE oil pressure regulators AND a screened counter-rotating balance shaft set in the oil pan being fed by a regulator that uses the excess pressure to squirt the bottom of the pistons with oil when they come down.

I sure wish those engineers would quit smoking crack on the job!

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HMMM, well this IS a Chrysler product. Zapco can only help, I am sure.
But all that extra horsepower is liable to make him faster than my Fiero so, reluctantly, I have to pass.