Recently had the 3.12 pulley installed on the Vortech and changed oil to Mobil 10W30. The oil level is below the H mark.. The oil pressure goes above 100psi when cruising at 70mph and pegs out under full power.. Before the pulley and oil change (used 5W30 organic) the pressure was 60-80 cruising don't recollect what it did at full power..Any suggestions and should I be concerned with the high readings? thanks

 

Is this the factory oil pressure gauge or an aftermarket. If it is aftermarket...where is the sensor located??

 

It's the factory sensor and gauge..

 

jpc350z,
I had this same concern a few weeks back after changing my oil. I too switched to 10W-30 Mobile1 and this was my first oil change on a new car that I was unfamiliar with.
Anyway, the higher pressure is caused by the increase in oil viscosity. I also came to the conclusion that the oil warmed up at a slower rate than the coolant temp, so just warming up the car didn't do much for oil temp. Until I drove around for 5mins and got the oil up to operating temp did I notice the oil pressure begin to stabilize and lower. Still higher than with 5W-30 though. Hope this helps ya out.

 

There have been others who, after changing their oil to synthetic, have gotten similar results. Do a search and you will learn more about it.

 

I'm getting an oil change tomorrow back to stock oil by Nissan. (Just to see if my pressure drops and my APSTFT smoke is remedied by lowering oil pressure. I only smoke @ high pressures / high RPM / high load)

If it does... I'll persue smaller restrictors on the turbos, or possibly NOT run synthetic, and just keep an eye on my oil a bit closer.

If you check out the service manual we should run between 20psi-57psi

Unfortunatly every car that changes to synthetic is running some HUGE numbers. (cold I'm @ 120psi+ @ 4k rpm)

I'll post my finding Friday night after I swap back...

spdkils

 

Iv had a couple oil sending units fail ----Always start from square one ---Replace it with a new one

 

Good advice. My gauge now permanently reads off scale..Coincidental? After an oil change to a synthetic? Thanks for all the advice..

 

Did they overfill the oil? Should be 4.5-4.7 qts with a filter change. Many quick lube places have no clue how to properly read our dip stick, and end up overfilling it. Adding 1 extra quart will raise the pressure to the roof!

 

The level is below the H mark and the lube change was done by one this sites's reliable and knowledgeable sponsors.. Can you guess...

 

hehe...if AAM change the oil...I am sure they did it right. I thought you might have gone to Jiffy Lube.

Keep in mind your oil pressure will be greater than 100psi when you first start the car when cold. So what is the pressure at idle when your car is warm?

If its 100psi plus, I am thinking its a faulty sensor. The oil pump is driven by the timing chain, so belts, pulleys, etc....will have no impact on oil pressure.

 

The gauge now permanently reads off scale.. New sensor or less likely the gauge itself..Jiffy lube ? Really now!!!

 

i have a question. how can to much oil in the pan (1qt) increase oil pressure.

 

guys.....this is because your running obviously a thicker oil....i highly recommend warming up the car in the morning....most of you built motor guys should know, and most of the turbo guys should know that you should take it very easily when you first start you car up in the morning. the oil must heat up....i have the same problem every morning when i start my car, oil pressure is very high....just relax, you can either wait around for a few minutes and the pressure will drop about 20-25 or you can drive off and keap the rpms below 3k for about 10-15 minutes, once the motor is warmed up to its fullest peak, it should be fine, the pressure should seem different from before but thats because your running a different weight....its nothing to be worried about, just simply take it easy in the morning....

Ben Y

 

The Vortech Supercharger can cause this as it uses the engines oil.

At least 4 others with vortech have had this problem.


Do a search...

Cheers


Paul

 

I have had sending units go bad as well in my 300zx TT. Maybe it's a Nissan thing.

 

+1 i have made the same observations. i always let my car warm up for about 5-10 minutes in the morning. even then the oil pressure is a bit high but as i continue to drive the oil pressure returns to normal. no worries, just warm her up. btw, i have the jim wolf oil pan spacer so i have 6 quarts of mobil-1 5w 30 running through my Z and my turbonetics turbo.

 

I have the Vortech kit with 5W-30 Mobile 1 synthetic. My gauge has been off the charts for months now. In another post I made the supposition that this is caused by the way that the Vortech "T"s into the OEM oil pressure sender causing a "dead air" space that is allowing particles in the oil to collect and damage the pressure sender. Just my guess but, I am going to have the dealer check the sender next time I take it in...

 

But the poster said the gauge is pegged to the max at idle...even when the engine is warm. That is definately not correct.

 

This is correct.. The gauge now does not move and it is pegged at 120+++ at all times.. Could be an inherent Vortech problem as noted above..