Oil Pressure???, What is the max? Options

[ranta18]

The book says oil pressure at 750 rpm for the 1st Gen Turbo is suppose to be 11 psi. Thats nice, but what is the WOT peak oil pressure? I'm not saying there is a limit or its bad if its over a certain amount, but what is the peak oil pressure the 4G63T motor usually makes? I ask because Garner is running 20 something at idle (but he has the balance shafts removed so that could be why). But when he gets on it, it goes to 100 psi right away and maxes out the gauge so it could be more. I want to make sure something isn't messed up and there isn't an oil passage clogged and making it run higher oil pressure. This would explain why the external oil cooler lines popped off and split open in the past.

WOT @ 6-7K rpm oil pressure anyone?

[natedogg]

I'm not sure what the recommended peak oil pressure is, but I have had a problem similar to this. My oil pressure would get high enough to blow the oil filter gasket on my car at WOT. I attributed it to either blow-by past the rings (which I kinda doubt now after a few compression tests that show good compression) or pressure seeping past the oil seals on the turbo and raising my overall crankcase pressure.

I cured this problem on my car with an electric vacuum pump sucking from the pcv location, breather location, and balance shaft stop-plug in the back of the block during WOT.

But I'm still not absolutely sure of the real root of this problem. Considering I'd probably have to take the engine apart again to find it, I'll stick with my vacuum pump band-aid for now. Though I may need a winter project soon anyway...