Thread: Anyone have low oil pressure readings w/ GFD oil line?

Not necessarily. It's the same reason PCV to exhaust works. The Venturi principle says otherwise.

This is the important part and I'm inclined to agree with you. Also there isn't much oil flowing to begin, hard to get a Venturi effect without speed.

In practice however, it just might solve the problem, and we may never know why. =]

I don't think venturi has much effect here due to viscosity. I'd have to refresh, it's been awhile since physics. If it solves the problem in practice, I'm all for it, but I've never had that problem. I'm sure there are other variables at play but if it works to relocate the sender, by all means do it. Reality usually > theory.

Yikes, I wonder what is up with mine. I have my sending unit teed like that and I read over 100psi on startup with a mix of 20w50 and 5w20. It drops to around 40psi when warm. Maybe mine just reads correctly? Also I am using a GTiR oil pump, not a stock DE one.

On my jdm gti-r i get around 85-95 psi cold depending on temps, 30-35 psi warm idle, 55-60 psi cruise (2500rpm's or less) 60-65 psi cruise (2500rpm and up) on a 5w40 oil.

I had low oil pressure when I bottomed out one time and denting my pan marginally. I was getting 12-16psi idle, 40psi cruise.

Stephen, any updates? did you switch your sender around?

Dan Martin says there's a possibility that the stock oil pressure sensor threads into the block and sees high pressure because it is fed by a tiny orifice not intended for flow, but just small on purpose to give the correct reading. You then go and put an -AN3 line on it and now you've got a higher volume of oil, and thus, less pressure in the line so if you read from there you'll see lower pressure readings.

Just a thought he had.

Time for us to go tune!

That could be right as well. I have seen some pretty low #'s as well when warmed up but mine is on a stock de and it was with 5w30 on a hot track day when i didnt have an oil cooler. I am using larger line than the gfd kit also. I have a nissport adapt, the sensor is in the end like factory and i have a mech. oil pressure gauge.

I think the weight of the oil could also very well be a factor. Everyone should compare what oil they are using as well.

Exactly. Nissan never intended for the sensor to be moved. So the made it just to read what comes out of there.