No different to non boosted motors. When warm it should run at around 25psi at idle and ramps up to about 70psi at about 3500rpm. Doesn't go much higher than that.
If you want to measure it you can run a 1/8th BSPT 'T' fitting off the block where the oils pressure sensor currently resides then run the sensor of one side of the T and a sensor for a proper gauge off the other. Or, you could get a sandwich plate between the block and oil filter with ports in it, this is the easier way I think as you can then run your turbo oil feed, temp and pressure sensors too.
DA9 LS w/JDM SiR B18C turbo
Looking for older Honda project car pre-1985
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