Alright, ever since I rebuild the motor the oil pressure guage reads about 70 with key on accesories, and when the car is on it maxes out past 110 and just stays like that all the time. Now the motor is an 87 TII block with 91' turbo and manifolds. Now alittle over a month ago my car had a bad wiring harness for the Microtech LT8 and I had to wait 14 weeks for a new one, then when I got the new harness together and got the car turned on for the first time in 3 months there was a huge amount of smoke comming out of the exhaust. I confirmed that oil was leaking into the turbine housing so I rebuilt the turbo and the car ran fine bt still had the high pressure problem. Now a month and a half later the smoke is comming out of the exhaust again and I pulled the spark plugs and they check out ok so that means the oil is leaking into the turbine housing again. What the hell is casing the oil pressure problem.

 

Have you verified oil pressure with a mechanical gauge?

The turbo has an internal oil restrictor...high pressure isn't going to kill it unless it's VERY high.

 

So your gauge is reading 70 PSI of pressure when the car is off? You don't have 70 PSI when the car is off... you have 0. Are you sure your sensor is reading properly? Does the pressure change at all with RPM, or stay completely constant? Sounds like your gauge is reading incorrectly to me... In regard to the turbo, I'll leave that to some of the other guys?

 

Only an idiot does this move (aka me) make sure that you are venting the pressure out of the oil fill spout in some shape or form. I ended up blocking them off and it leaked oil past the turbo seals and smoked like mad. Dumbest move I've made so far.

 

It reads 70 when you turn the key to prime the system, and while I'm driving it will very rarely drop down to 60 and even sometime go down to 0 then go right back up to max.

 

HAHAHAHAHAHAAH!!!!!!!!!!!!!!!!!!!!!!!!!!
no....
ur meter's broken. get it fixed and test the oil pressure with a real mechanical gauge... then come back if anything is up.

 

Well, before when the turbo blew it was vented and about a week ago I capped off the extra opening next to the fill neck. Once you opened up that vent did the smoke stop or did you rebuild the turbo?

 

Dude, you got a couple of problems, sounds like. Tap the sender unit on the engine at idle- does the gauge move? Definetly a sender or gauge problem there, unless you did something REALLY funky during the rebuild. Like plug up the relief valves...

 

the oil doesn't prime itself... it's at 0 unless the car is running. your gauge is screwed.

 

Correct, oil pump is driven by engine rotation, not electricity... no RPM, no oil pressure. Check your gauge, and check your turbo building skills, I don't think it's excessive (that means "super high") oil pressure causing your issues.

 

Oil pump is chain driven by the shaft

Replace the pressure sender or inspect the sender wire, usually the problem.

 

BTW...........

If you have a turbo rebuilt by a company ask if the removed the internal restrictor.

My rebuilder did mine and removed the restrictor because he couldn't fully clean it with it in there.