TwinTurbo.NET: Nissan 300ZX forum - Found my cause for low oil pressure
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Subject Found my cause for low oil pressure
     
Posted by bigsyke on June 05, 2013 at 9:34 PM
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Message Bought car, 0-10psi at idle, no more than 30psi throughout RPM range. Dented pan, which I fixed. Oil pressure was better, but still would sometimes drop to extremely low pressures, and at the track got no higher than 60psi. Sometimes it would hit 5psi at idle --thus I thought my sender was bad. Nope, it was good.

The oil pressure spring that bleeds off to the cooler was bad. Not sure if there is a thermostat inside there as well, but my oil cooler was getting hot shortly after I started the car. I blocked the Oil cooler return line with a 3/8ths NPT Ball valve. I can control the return rate for the track, and close it for the street.

At 2500rpms, I'm at 60psi, hot --always. At redline I'm past 100psi. Also no more horrible oil burning fumes, turbos spool up quicker, and gas mileage has gone WAY up.

Just a heads up, as I've seen enough youtube videos with people having sub-par oil pressure, or pressure doesn't increase that much with RPM

     
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