bricem13

Hi gents


I always wonder about my oil pressure reading. I replaced 2 times the oil sender unit without any effect on the reading.

At idle all is fine - cold and hot.

Hot idle:



When I rev it:








It is within specs according the board manual (3.5 bar min at 5000rpm). But according to some posts here it is a bit low.

From the idle pressure, pump delivers correctly. At cold if I rev it the pressure is just a little above 4.0bar.
Therefore I changed the valves springs without any change.

I could change the sender again for an oem (does someone have the vdo part number btw?) but I somehow think the gauge itself could misread
At ignition on, engine off the gauge hand is below zero. Is there a way to check the gauge? Does someone know the pressure/resistor spec of the sensor?

Metal Guru

I had the opposite issue; gauge pegging 5 bar under acceleration or when just hot revving in the driveway. I had tried to remedy the problem with aftermarket senders but eventually an OE sender took care of things.

Spyerx

These behave differently than the older cars are more similar to the 997 gt3.

An engine in good tune will see 3-4 at cold idle, 2-3 warm idle, and around 3k will be pegged around 5 and stay there.

If I’m reading right yours is behaving ok, but if you are concerned you can test the pressures with a manual gauge.

BTW, my 71 with a what we’ll call modern internals oiling, (996 turbo oil pump.. lol) and pressure bypass spring tuning sees almost the exact same behavior.

996AE

+1

s65e90

Looks normal

delanobe

Hi,
If I were you I would change your oil sender for an oem VDO.
I had almost the same issues with an aftermarket one and I've heard from others that they also had issues.

bricem13

Thanks all for the replies.

Vdo original sender is way to go. In between gauge contact cleaning with steel wool and contact spray gave some higher pressure cold... Will confirm on the next drive

koenig_roland

Had the same behavior at my convertible with fresh overhauled engine.

Used an "Herth+Buss 70542000 Sensor" and sent the pressure-gauge itself for an overhaul to a rebuilder (re-soldering, cost less then 100,-) and solved the issues from both sides...
Have used several of cheap oil-pressure senders over the years in my both 964th and being not fan of cheap (50,- ballpark) replacements anymore

bricem13

Thank all for the replies , I'll change the sender.

Last question, what is your dash gauge reading at ignition on (with engine off)?
Mine is below 0 like -0.5 bar

Hatzenbach

mine is just a tiny bit below Zero