1982 245 GLT Turbo 166k
My oil pressure gauge(3 bar) has always gone to the max whenever the car was started so I figured it was just a bad sending unit. I decide to replace my orginal garrett T3 with a tdo4h-13c from a 1990 940 turbo. My original T3 smoked between shifts but it also just couldn't make much boost. It was always spooling and it had a lot of shaft play. So I hooked up the new turbo. When I started the car and revved the engine, blueish smoke kept shooting out of the exhaust and the inside of the exhuast side of the turbo had oil all over. So I figured it was getting too much oil pressure b/c the orignal garrett T3 was alot bigger so it needed more oil. So I bought another bolt that was the same size as the original oil inlet bolt that screws in to the top of the turbo that lets oil flow though into the turbo. I drilled the bolt out but I made the holes about half the size of the stock bolt's holes. I ran the car and still had the same results so i made another bolt with even smaller holes about 1/4 of the original but still haad the same results. I decided to take the turbo off and see if it blew an oil seal. I decided to run the car with out the turbo on it. I jimmyed everything together so it could run it without the turbo. I started the car and it shot oil like 4 feet into the air from the oil line that usually goes into the turbo. So I took a rubber hose and connected it to that oil line and ran it to a milk jug. This time when I started the car I watched the oil pressure guage and it only read 1.5 bar! This was the first time I have ever seen it be at any other level other than max. I only ran the car for about 3-4sec but the milk jug was filled up with about 1.5 quarts of oil. I don't think a turbo would ever need that much oil and that's why my new turbo kept leaking oil. So my question is what do you think is causing this much oil pressure? Is it something to do with the oil pump and if it is what parts would I need to fix it?
Thanks
Dave