Oil Pressure Varying Under Braking

[Fujiwara]

My Oil pressure varies between 2-6 on the standard gauge in my R34.

I have a GReddy Oil Cooler fitted on the car.

When i come to my driveway and start to brake, why does the oil pressure drop from around 4 to 2?

Is this bad? or is this normal for the pressure to drop when under brake?

And what are the cons of high/low pressure. Is there such a thing as one being better than the other?

I take it that pressure will vary on conditions (idle/throttle) etc but don't know the "optimum" pressures if there is such a thing.

Just hope that 2 - 5 is not going to damage my engine?

[Duncan]

mate, if your oil pressure changes when you brake it is surging around your sump - very dangerous.

Most likely your oil level is low unless you have a race car with great tyres and are stomping on the brakes real hard.

At idle it should be at 2ish when the motor is warm and as high as 6 when it is dead cold - will vary a little depending on the grade of oil you run. On top of that it will increase with revs.

[Beer Baron]

first thing, the stock gauge is relatively accurate, BUT it is mega slow in reacting. considering when you are braking you are most likely not on the throttle, and possibly not even in gear which means your revs are around 1000rpm which means oil pressure of around 2 bar is normal.

[Fujiwara]

When i brake for the driveway, i do depress the clutch as i basically stop.

But i'll check out the oil level now.

Thanks.

[T04GTR]

lol