So i have a 98 r34 gt-t, recently fit in an greddy oil cooler with a built in thermostat sandwich plate.
When you start the car when complety cold, the factory oil pressure guage reads correctly, about 4-5 bar at idle. When the oil gets to proper temp the pressure then sits on 2 bars at idle, will go to 3 bars when at 2,000rpm, and 4 bars when at 3,000rpm.
If i were to turn the car off, and then start it again, the oil pressure will now read about 1-1.5 bars, 2 bars at 2,000rpm and 3 bars at 4,000rpm.
Sometimes the needle will jump up and down and then revert back to reading 2 bars at idle, sometimes it doesnt.
Today it was reading correctly, drove it for an hour, guage was reading 2 bars turned it off and started it, guage read about 1.7-1.9 bar, after about 15 or so mins or driving, while sitting at about 3 bars of pressure, i saw the needle drop back down to 1.9bars, i was in 5th gear doing 80kph, about 2,000rpm or so. At idle it would now sit at about 1 - 1.5 bar.
I dont get it, is this normal? Is my oil pressure guage faulty? Is the oil cooler and or sandwich plate somehow affecting my oil pressure readings?
Also my stock boost guage sometimes completly stops reading and then will randomly go back to reading, so i am hoping its got something to do with faulty guages and not engine related.
Any help appreciated thank you!