doesnt hold oil pressure and sqeeking sound

[andytalon]

alright I got a 91 gsx, with 16g turbo,custom exhaust downpipe back, high flow cat, ported exhaust manifold, manual boost controller extreme motorsports, super afc, modified filter with k & n, air fuel and boost autometer sport comp gauges oil pressuse and egt gauges, accel spark plug wires, modified side mount intercooler and hard pipes to turbo and intake 1 3/4" outlet compressor elbow 255lph walbro fuel pump, aem true time cam gears

Basicly the problem is, when I start the car i hear a squeekin sound I am already awear its my crank pully but what im mostly concerd about is the oil problem, I start it and its up to 75psi then slowly goes down till it gets a lil lower than 25, when its all warmed up i get goin at about 50 mph it goes to 50psi and then back down to 25 as i slow down and keeps changing as i go... anyone know the problem?? please write back Thanks

 

[Zero Banger]

Not sure exactly what the cars recommended pressure is but if the main bearings are going out or they are out of spec. Then the car could loose oil pressure. If the pump has gone south, same scenario. Can you stick a different oil gauge on the engine just to confirm the pressure is accurate?

 

[andytalon]

no its still does the same thing, still cant hold oil pressure, What do u think it is?