Thomasfd

I know this is been discussed many times but i cant find the answer that im looking for.
The issue I have is that i installed a cpts sensor at the OEM oil gauge sender position and the readings i get on my loggings are kind of low and will like to know if its the position of the sender the problem.

The car is single turbo with OMP delete and double greddy oil coolers. The readings i get is oil pressure at cruising 60-70 psi 40-50 idle and when on boost it starts to drop. My temperatures are at the top 140-160 degrees if in traffic and drop to 120-130 when the car cruises.

DaleClark

iTrader: (55)

The specs are in the shop manual for what is good/normal

That really sounds fine. In general if you have 30 psi at idle and 60 psi at 3000 RPM minimum you are doing good.

Dale

Sgtblue

iTrader: (16)

IIRC 50 psi @ 3k rpm is minimum in the FSM. You’ll probably see oil pressure readings highest at cold start-up with fresh oil and then over time they’ll slowly start to drop a bit on cold start with a bit of fuel dilution…which IMO is kind of normal for a rotary.
Oil temps sound fine, but I’ve never monitored mine.

Thomasfd

I think im a bit low on oil pressure the temperature i know its because i dont use a thermostat but the pressure is on the low side because on WOT it drops down to 50 psi, but its totally normal on idle and 3000 rpm.

Sgtblue

iTrader: (16)

Edit

Banzai-Racing

iTrader: (11)

Did you leave the shaft in the front cover when you eliminated the OMP? I have seen multiple engine failures from people removing the shaft and not blocking the supply passage, causing oil to blow by into the cover.

I have also seen where the oil pump set screw works its way into the pump and ends up sitting inside the oil pick up tube. This allows the center section of the pump to rotate.

Thomasfd

No just removed the OMP and used one off your own blocking plates and the injector plugs nothing else.

Banzai-Racing

iTrader: (11)

Great. Was the engine rebuilt?

Thomasfd

Yes its a street ported rebuild

Banzai-Racing

iTrader: (11)

Then there is the possibility that the woodruff key on the oil pump was pushed out when the gear was installed.

Thomasfd

But wouldnt it affect the idle pressure or the cruising?

Banzai-Racing

iTrader: (11)

There is a nut and washer holding the gear on the pump, but the key stops the gear from slipping on the pump shaft. I am just giving you possible issues that would cause your described problem. These are all things I seen in the decades I have been rebuilding engines.

scotty305

iTrader: (2)

I have an aftermarket oil pressure sensor and oil temperature on my car, the readings get datalogged by my aftermarket ECU. Both sensors are mounted in a Banzai aftermarket oil filter pedestal. This screenshot shows pressure vs RPM, the blue dots are when the oil is cold and red dots are when the oil is warm. This is 20w50 oil on a stock engine with single stock oil cooler (base model), I don't know the exact mileage but I've put about 20k miles on it. It was a used JDM pullout engine from a 1996-1998 car based on the engine harness and turbos that came with it, so I'm guessing at least 50k miles on the engine total. Oil pressure is higher when the oil is cold, and lower when the oil is warm. I haven't noticed different readings for high boost or low boost, pressure seems to depend mostly on engine speed and oil temperature.

Thomasfd

On my loggings i go about 85psi to 4000rpm and then always dips exactly at 4000 rpm about 15-20 psi.

Thomasfd

Thanks guys will check everything again and see what the problem is.