2G New 7 bolt build Low Oil Pressure

[88BB8B]

I know I'll probably get poached for this, but I need some help figuring out my situation.
I've got a fresh built 7 bolt 2.0l Supertech pistons and eagle rods. I'm positive all of my bearing clearances are great! (0.0028 on rods 0.0025 on mains)
I have low oil pressure at cold idle (haven't run long it enough to warm up.) I'm seeing a consistent 15 psi as the rpm jumps between 1500 and 2000rpm (something with the idle tune)
It's important to note that my pressure gauge3 is reading off the head (stock turbo feed location) I don't know if that would make a huge difference.
I did delete my balance shafts. I'm also quite sure I blocked off my oil ports on the front shaft properly.
I can't remember everything perfectly as I built this motor over a year ago, but I did do something to my oil pressure relief valve. I also have a somewhat questionable loop bypassing the oil cooler which could possibly be restricting flow, and a remote mount oil filter housing with no porting done to it.
No oil pressure head mod.
I'm going to start at the pressure relief valve, if there's anything else you guys think I should check, please let me know. Thank you all very much.

 

[88BB8B]

Update, so I really have no idea how the oil pressure relief valve works, I'm trying to figure it out. But I think I did something brainless when putting things together, which is causing my problem. This is what my relief valve looks like when I pulled it.

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I'm assuming having things together this way is allowing oil to freely bypass the motor. Is that correct?
If so, does anyone know where to get a new one. I'm pretty sure the missing parts are long gone.

 

[19Eclipse90]

That’s an oil bypass valve, not a pressure relief valve.

With the spring and cup missing, you’re allowing oil to bypass the oil cooler. It’s still going to feed the main oil gallery from there, main bearings and all that. So that is not the reason you would have low oil pressure.

This is all covered in your post from 2021: Help with oil filter housing ports

 

[jdxnc]

You need to take the pressure reading from the filter housing. 15 psi at the head is about normal as it's at the very end of the oil gallery.

 

[88BB8B]

Thank you very much. I knew I took that apart for a reason. I'll make a T off my current turbo feed, which comes from the OFH and check pressure there.

 

[88BB8B]

I appreciate the help very much. I swapped my turbo and gauge feed locations so now my turbo is getting oil through the stock head feed, and my gauge is down on the OFH. I saw 40 psi cranking and over 50 at idle.

 

[DSMPT]

Update, so I really have no idea how the oil pressure relief valve works, I'm trying to figure it out. But I think I did something brainless when putting things together, which is causing my problem. This is what my relief valve looks like when I pulled it.

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Most likely you made it apart to block off the oil cooler ports.

https://www.dsmtuners.com/threads/oil-cooler-deletion-help.445668/#post-153755852

does anyone know where to get a new one.

If you want to use the stock or aftermarket air cooled oil cooler, MD356695 is the stock part number. It's the newer design one for late EVOs but would work the same. If you would want a lower temp thermostat, HKS sells one. The part number is 15999-AM001.

 

[88BB8B]

Most likely you made it apart to block off the oil cooler ports.

https://www.dsmtuners.com/threads/oil-cooler-deletion-help.445668/#post-153755852

If you want to use the stock or aftermarket air cooled oil cooler, MD356695 is the stock part number. It's the newer design one for late EVOs but would work the same. If you would want a lower temp thermostat, HKS sells one. The part number is 15999-AM001.

That's good info. Thank you.

 

[99dsmer4g63]

You say on a cold start at idle you get 50 psi on an actual gauge reading at the OFH?

That seems kinda low to me. Cold start I can almost double that.

-Daniel

 

[jesse12345]

You say on a cold start at idle you get 50 psi on an actual gauge reading at the OFH?

That seems kinda low to me. Cold start I can almost double that.

-Daniel

Mine is about 80 cold and 20 hot.

 

[88BB8B]

You say on a cold start at idle you get 50 psi on an actual gauge reading at the OFH?

That seems kinda low to me. Cold start I can almost double that.

-Daniel

Mine is about 80 cold and 20 hot.

Yeah, a slight correction there (the gauge I was using tends to get a little stuck around 50psi) after a couple more startups, it unstuck and I was seeing 75psi on cold idle.

 

[danl]

You need to measure oil pressure at the oil filter housing. I prefer to measure after the pump but before the oil pressure relief valve and also before the oil filter.

Yeah, a slight correction there (the gauge I was using tends to get a little stuck around 50psi) after a couple more startups, it unstuck and I was seeing 75psi on cold idle.

Thats normal. For reference this is what my cold start oil pressure looks like with 10w/30 valvoline VR1. The oil matters a heck of a lot as does actual starting temp. 10 degrees F is a world of difference from 73 degrees F as shown in my log.

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[We're on Boost]

Might as well throw another pretty picture in here for cold start oil pressure.
This is my car at cold start on July 9.
1230 RPM, Coolant temp 64 deg F.
Valvoline VR1 Full Synthetic motor oil, 5 quarts of 20w-50 plus 1 quart of 10w-30.
Oil pressure measured from a port on the OFH before the filter with an AEM stainless 150 psig sensor.
The vertical scale on the graph is the actual pressure divided by 10.
So 9.2 on the graph for example is 92 psi.

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[88BB8B]

Wow! I've never seen oil pressure logs before. I'm sure that will be very helpful to anyone that is worrying about their numbers.

 

[danl]

Wow! I've never seen oil pressure logs before. I'm sure that will be very helpful to anyone that is worrying about their numbers.

Thats one of the reasons I put mine up. It is powerful information. What is even more crazy is seeing how much oil pressure changes with changes with temperature and engine speed. This is the same log, but at the end of the drive, sitting at an idle.

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