the truth about proper turbo oil pressure

[gsx7707]

i have an hx35 what should be safe oil pressure at idle and through the rpm range i have balance shafts eliminated and oil pump mod

 

[JusMX141]

This information is in the Holset service manual for the HX35/40 turbochargers, and has been discussed many, many times on this site.

13. Oil pressure of 150 kPa (20 lbf/in2) must show at the turbocharger oil inlet within 3 - 4 seconds of engine firing to prevent damage to turbocharger bearing system. A flexible supply pipe is recommended.

14. The minimum oil pressure when the engine is on load must be 210 kPa (30 lbf/in2). Maximum
permissible operating pressure is 500 kPa (72 lbf/in2) although 600 kPa (88 lbf/in2) is permitted during
cold start up. Under idling conditions pressure should not fall below 70 kPa (10 lbf/in2).



No less than 30psi under load, no more than 72psi during any time the turbo is operating aside from a cold startup.