philsblwnz28

iTrader: (10)

Ok, a buddy of mine has a 99 Z28 with 243 heads, 224/230 cam, stock bottom end. He said that lately he has noticed the oil pressure has dropped some. Does this look normal after running for 30 minutes?

BigBirdLS1

If he revs it does the oil pressure drop down then spike up or does it go straight up drom there. Did he change oil types or weight? I think the old rule is 10psi per 1k rpm so he should be fine. Besides the gauges on these cars aren't known for their accuarcy.

philsblwnz28

iTrader: (10)

The oil pressure goes straight up and he is using 10w 30 mobil 1

NVR_SPDS

iTrader: (39)

try swapping out the switch, and see if the reading changes.

What kind of pump, and what kind of mileage does it have on it?

philsblwnz28

iTrader: (10)

the pump has 10k on it, the pump is a high volume pump.....(dont recall name

NBM-LS1

iTrader: (7)

replace the sending unit or check oil pressure with a mechanical gauge to check accuracy.

Juve PS

I have the same problem with my T/A, and after a while the needle goes down to the red line. I know for sure it has plenty of oil and I also replaced the sending unit and it didn't fix the problem... Please help me too!

408ws6ta

Im researching now because my oil gauge in my 408 looks like that at idle. I have only owned the car for a month and it has only been on the road for 3 days. Im scared to drive it with such low pressure.

Any ideas?

Darkman

iTrader: (2)

in addition to sending units, check the grounds (star washers are your friend) - starting the negative battery post which the system uses for reference values.

408ws6ta

cold start its around 35psi on the gauge. once hot its around 17-20psi.
Im going to change the oil and filter to 10w-40 and see what it does.

I just got the car so I dont know much about the motor other than its an iron block 408 stroker...

highgear

If the Pump and Gauge are working; warm Idle should be 35psi and Normal Hwy driving 60-70mph it should at 40psi. (5w-30)