Just wondering what peoples oem oil pressure acts like.
Mine (2003 w/7100rpm rev-limit) has very bad pressure control, when revving say 6500 on hot motor I see 90psi plus on oem gauge.

Is the gauge some what correct?

The pressure regulator doesn't appear to function with a shelf pressure of say 65psi like a normal oil system. Is this normal for vq35?

What is the real observed oil temps people are seeing and under what conditions?

Does the Rev-up motors oil pump address the problem? (larger by-pass hole on the regulator?)

I am building a high rpm motor, and most extreme motor builds must include modifying oil system or there is real issues.
Any Comments Welcome!!!!

 

FYI
I have a 35th with the rev-up motor. The damn oil pressure gauge could second for a tach the way it works. At idle and air condition off (650 rpm) it reads about 7-8 pounds, freeway 70mph (2650-2700 rpm) in 6th is straight up at 60psi. I use Castrol 10-30 too.

 

Thats the way mine works too.

Is it the gauge system or is this real pressure?

 

Yes it works. Yes it is accurate. Yes high pressures at redline is a good thing. No there is nothing you need to do to improve it, unless you want to swap a NISMO pump, which will do nothing but provide a little extra insurance that it keeps working all the way to 8000rpm. If you ever build the motor to rev that high.
just don't rev the **** out of it when cold and you'll be fine.
Will

 

My oil pressures are about the same as you're seeing. As far as temps go, I've seen 215F just having a little fun on the street and at the track 259F. I've installed an oil cooler but don't have any updated temp data. Will let you know after next weekends track event. As far as the oil pump for a high rev engine, I've thought about this, and wonder too it the rev-up's oil pump is good enough for sustained high rpm. The Nismo pump is pricey but good to 8500rpm - the price is maybe worth the piece of mind?

 

90 PSI at 7000 rmp = normal
(I have the revup motor)

 

Your Oil pump is a positive displacement pump. This means that flow rate is based on RPM. With your engine oil passageways being fixed, oil pressure is based on your viscocity and flow rate.
Motor oil in general: Low temp = high viscocity (relative), high temp = low viscocity (relative).
As you can see your oil pressure will be all over the place based mostly on:
Oil temp and RPM.
If you want more info, I can explain fluid mechanics in detail

 

What it appear to me is that we don't want or need that 90 psi to run our valve train controls and the rest of motor doesn't need it either.

The size of the bypass hole of the pressure regulator on the oil pump is .350" this may not be large enough for the pump volume versus bleed off rate.
Or the regulator is set very high from the factory hence the use of O-ring seals on the pressure side the system.

All main oil passages are now .625" min. and are smoothed at the intersections.