Oil pressure

[zalama1]

How you guys control your oil pressure when putting big turbo in?

I have holset HX40 and my engine oil pressure light comes on if idle goes under 900 rpm. Have to keep idle little higher. Allso I'm worried is engine oil pressure is enough in higher RPM.
I did put small orfice to turbo's oil feed line, but I guess I still have to make it smaller.
I know that big turbo need more oil for bearings too.
I have driven the car few hundred miles with no other problems.

I have not checked the oil pressure with gauge yet. Stock gauge in not in use now.

 

[awdrst]

Wow your a brave man to be driving the car like that with no oil pressure gauge at all and the light on. I would go buy a oil pressure gauge right away. Its hard to tell whats really going on without real readings. You can't be to safe when it comes to somthing as important as your oil pressure you could be asking for a badly damaged engine and turbo. Btw i've got a t3/60-1 on my car no reducer and fed from the oil filter housing. I've got great oil pressure at idle to redline.

 

[zalama1]

I know it was kind of risky to drive it. I rebuild the engine with new oil pump 50 000 miles ago. Before the turbo swap I had 16g and no oil light flashes.

Now I need to correct what happened:
Same time I swapped to Holset HX40, I got brand new VDO 0.6 bar ( 8.8 psi) pressure switch, so every blink means oil pressure goes below that.

I was going to put my original mitsubishi oli pressure switch back on, but tested it first with pressure gun and electric tester.
It opens at 0.3 bar ! That's like 4 psi! So I didn't go back to original switch. I wonder what's pressure setting for new mitsubishi switch?! Anyway in this case 0.6 bar VDO switch is much more safe.


I'll get oil pressure gauge anyway.
Anybody knows how much 4G63 should have oil pressure on idle ?

And I need to add I'm very happy how early this turbo wake up! Big suprise !