First off its a S13 Blacktop. As for oil i'm using Valvoline VR1 Race 30 which was the recommendation from Brian Crower for my 264's. at start up i'm running about 70 psi cold and as the car gets warmed up the oil pressure drops to 5 psi in a matter of 3 or 4 minutes. idle is 750 rpm. driving the oil pressure seems to be fine. its pulling about 60-70 psi at 3500 going up a mild incline. i'm curious if anyone else has a similar issue and if so where did they find the solution at? i'm not looking to have an answer given to me on here, just some insight or possibly a thread somewhere that can help me out. i'm on a tight budget so its something i need to get fixed right off the bat instead of testing different things.

If you're experiencing varied pressure like that, you could try double checking with a different gauge. Idle should be about 11 psi, and around 3200 RPMs should be between 46 and 57 psi. My car, with about 30k miles on the ACL bearings I installed pulls roughly those numbers. More than likely, if the numbers check out the same, you've got an issue with the regulator valve inside the pump. I don't think Nissan sells those as stand alone parts. Normally, they sell the whole pump and front cover as a single unit. And if you've got pressure issues, it could come down to a full pump replacement. It's the unfortunate problem when it comes to purchasing a motor that's been in a salvage yard; there's bound to be problems of some kind with something on the motor.

well if it ends up being your pump, hit up the nismoshop for a pump/front cover. cheapest at around 150 brand new.

I appreciate the input guys. Ill post back after I get it all figured out.

k keep us posted.

i just remembered something else. i think maybe some gas got pushed down passed the rings because i was trying to troubleshoot an ignition problem. igniter was bad. i'm kinda thinking that could be something that would affect it in that way being there might be some gas mixed in.

Change the oil and see if it changes your running pressures.

Ive already been planning on doing that on my day off tomorrow. I just didn't think a little gas would make it run a constant 5 psi. I figured it would make it bounce around. Just my theory on that.

sorry for the long delay. turns out there was gas in the oil due to an injector o-ring that finally blew off the rest of the way. just got the new rings and pintle caps yesterday and am gonna try go get it finished up before christmas or new years.

Any updates?

homeslicej2 wrote:Any updates?

Was wondering the same too.

Lack of updates typically means one of two things. The OP's car has been repaired and is running great, so he/she doesn't check back in on the forums until something else goes wrong, or they haven't gotten around to try fixing it yet. Considering the OP only has 16 posts, I'm betting on the first possibility.

Either way, I hope the OP's car has been fixed and is running great. I would love to hear the results.

Sorry guys. My hours at work have been getting screwed up due to shortage of employees. As soon as i get it figured out ill let you all know.

I understand that man. I go to school 3 days a week and work 3rd shift two nights a week. Sometimes, I just don't have time to work on the car... :/ Hope you get it sorted out and check back here for more help/updates.

*UPDATE* finally got time to work on the car and it seems to be having the same problem. i am going to get a hold of a different gauge to test the oil pressure because mine drops about 5 psi or so as soon as i even start to touch the brakes. i'm thinking either a faulty gauge or just faulty connections. worst case scenario i need a new oil pump. i'm just hoping my bearings are still good. it sounds like theres a feint knock at 3k rpm but its hard to tell because i have no exhaust on the car at all. at idle it sounds just fine tho. maybe i'm just over thinking it.

Are you using a manual gauge? I would try a cheap manual gauge before I trusted something electronic.

i'm using an electronic megan racing 52mm gauge. i'm thinking i may not have it hooked up perfect or its just a bad gauge. two of my biddies had the same gauge and never had a problem with theirs. i'll stop by advance either today or tomorrow and see if they have a gauge there to use.

Depressing the brake pedal drops oil pressure? Sounds like interference among wires. Go rent an oil pressure test gauge from the parts store (They give u your $ back as long as u return it), use an adapter (my rental came with a NPT to BSPT adapter), and thread the test gauge into the stock pressure sensor location right by the oil filter. Check your oil pressure with the engine at normal operation temp at idle (800rpm + or - 50) and 3200rpm no load (revving & holding in neutral) per the FSM. You should have great than 11psi at idle and b/t 46-54 psi at 3200rpm. Engine has to be fully warmed up to check correctly. Coolant temp needs to be above 170F (temp at which the stock thermostat starts to open).