Freshly build rb30det high oil pressure

[Driftieboy]

Hi Guys, i have a freshly built rb25/30det s2 head runs mint makes a nice 410kw on e50 but my oil pressure seems very high, it has a brandnew NITTO oil pump with gtr pickup...

Oil pressure on start up is 100psi, even when both oil and coolant temp are at running temp and after a 2km drive up my hill/mountain which i live at the bottom of and about another 1km along the flat it stays at around 100psi untill probably about that 3km of gentle driving it drops down to a cruising pressure of about 60psi and plays ball and flucuates from approx. 25psi-80psi depending on revs like you'd expect.

Ive got oil cooler with filter relocation and two seperate oil pressure sensor, one going to a gauge and the other is a brandnew bosch combined oil temp/pressure sensor going to my link ecu which shows on my powertune dash and both gauge and dash are showing the same oil pressure readings.

To me the 100psi seems high? Also to add im using 15w-60 HPR15 Penrite full synthetic oil..

 

Cheers!!

 

[GTSBoy]

11 minutes ago, Driftieboy said:

brandnew NITTO oil pump ..... 15w-60 HPR15

Seems about right to me. 15w oil is a bit on the heavy side when it is cold.

Depending on what bearing clearances were set up, 100 psi is a completely expectable result.

[Duncan]

Agreed on both counts...depending on engine builder opinion and clearances a lighter oil might lower the pressure at cold idle but presumably 100psi is your oil relief spring pressure and is not dangerously high

[Dose Pipe Sutututu]

I run at Nitto pump too, albeit I use 15W50

~7 to 8bar cold start is completely normal, in winter I've seen 8 bar+

 

Also does your oil filter/cooler have a thermostat?

[Driftieboy]

Ok awesome thanks everyone! Good to have some reassurance!! No oil thermo...

[Dose Pipe Sutututu]

15 minutes ago, Driftieboy said:

Ok awesome thanks everyone! Good to have some reassurance!! No oil thermo...

Get a thermostat, helps with getting the oil at operating temp/viscosity quicker. Also reducing the likelihood of over chilling the oil when you're out and about town on a cold day.

 

[Driftieboy]

Cheers just ordered a mishimoto one!