Calling all of the SR20/KA guys!

[Jagstang]

Hey guys, today we got my SR engine swapped in, and before doing it, we tried wiring up the lower harness/main harness.

We started with the lower harness and noticed that everything plugged up except the oil pressure sensor plug (SR lower harness oil pressure sensor plug has 1 prong/1 wire, and the yellow SR oil pressure sensor on the block has 2 prongs). Below is a picture of what i'm talking about, it's located on the passenger side, right next to the oil filter (please help me confirm that it's the oil pressure sensor).



So anyways, in the end, we decided not to wire it since we thought it might throw off codes, and make the SR run in limp/safe mode. So my question is, can I take off the KA's oil pressure sensor and mount it on the SR engine? And wire up the KA lower harness oil sensor plug to the SR lower harness, so that everything works out?

Or can I just wire everything and leave that yellow sensor plug with nothing on it? Should it run without any problems?

Keep in mind that I will be using the stock gauge cluster that the KA was attached to. So it should work right?

Lastly, would the tachometer work on my cluster? Since this SR is similar to the S15?

Any help would be greatly appreciated!

[kouki munster]

That unit doesn't do anything but turn on the oil light on the dash when the oil pressure is below I think 7 psi.

[Jagstang]

That unit doesn't do anything but turn on the oil light on the dash when the oil pressure is below I think 7 psi.

Ohh Ok, thanks a lot! So technically, I can have the car running fine without it being plugged?

Also, does the s14 kouki SR have 2 oil pressure monitors on the cluster somewhere (because there's 2 prongs on the pressure sensor)? So one wire for the light on the dash when the pressure is "low" and one for a gauge, like the S15?

So to solve this dilemma, I can just Just cut and solder in the KA connector to the SR lower harness, and then thread in the KA sensor onto the SR block and the light will turn on if the pressure drops too much?.

Oh and correct me if I'm wrong guys, but I'm not sure if my stock tachometer will work with the SR20? Will it?

[Hijacker]

Whatever switch you have doesn't look like the factory unit to me. The factory is a single wire, that just switches on when the system falls below a preset pressure. Most dual wire setups that have a larger sending unit like that are generally after market units meant for monitoring pressure more closely.

Just for reference, this is a single wire sending unit commonly found with gauges like Auto Meter


Here's one for a Nissan. Single wire switch type


I just double checked with my S15 manual, and there should be only a 1 wire on/off switch just like every other Nissan.

[Jagstang]

Whatever switch you have doesn't look like the factory unit to me. The factory is a single wire, that just switches on when the system falls below a preset pressure. Most dual wire setups that have a larger sending unit like that are generally after market units meant for monitoring pressure more closely.

Just for reference, this is a single wire sending unit commonly found with gauges like Auto Meter


I just double checked with my S15 manual, and there should be only a 1 wire on/off switch just like every other Nissan.

OMG. . Thank YOU! So my SR has an aftermarket oil pressure sensor?... Then the KA Oil Pressure Sensor will work with the stock SR lower harness?

[Hijacker]

Yep. I believe when I ordered my last one, the p/n was a crossover for the KA.

[Jagstang]

Yep. I believe when I ordered my last one, the p/n was a crossover for the KA.

Do you happen to know what gauge that sensor might be for? it's pretty big, and becomes narrow when it's screws on the block. But the engine is already on, and it's almost impossible to fit any tools to loosen it up. I'm thinking it might be easier to just get the gauge, plug it up, and done.

Edit: I think my oil pressure sensor is for a 300zx VG30DETT. . . Here's a picture of one on google. Looks VERY similar.



Here's another angle, you can see the ripples on the side, looks exactly like what mine has.



Found the part number too. It's 25070-30P01 for a TT engine only. Weird. . .

I googled up the part number on google images, and I saw a picture of a dirty one that looks like mine, so I clicked on it, and it took me to this site

http://diy.icydesigns.com/article/133/N ... placement/

So now I knew what sized wrench I needed for the nut in the back, so I grabbed a 17mm Wrench, and took that b**** off.

Here's pics of it out of the car.





So now, the final question is. . . Why would the previous owner put a 300zx oil pressure sensor. . . That concerns me. . .

[Jagstang]

Bump

[Razi]

I'll bet it does.

Hijacker said the P/N when he ordered his was the same as the KA one.

[StryfeS13]

Yeah man. That sensor is not the stock sensor as you've already found out, and yeah the KA sending unit works on an SR.

However, if you really want the truth, that thing isn't going to do a damn thing until your motor is in critical condition anyway(7 psi of oil pressure and under.) You really don't need it and it won't effect the way your car runs.

If I were you, i'd get an aftermarket oil pressure gauge, just for peace of mind.

[Hijacker]

SRs and KAs should run ~11 psi at idle

As for that sending unit, it's hard to imagine why someone did that. You can picl up a decent after market gauge and sender and run that. I prefer full sweep gauges. I have an autometer 90 degree sweep gauge and hate it.

Interestingly enough, the z's sender is listed as a sending unit and not a switch. But the manual has it as a single wire unit with a two prong connector

[kouki munster]

It most likely acts as both, it outputs a signal to drive the gauge and will also turn on the light when the oil pressure gets to low.

[biggie]

SRs and KAs should run ~11 psi at idle

Am I losing it? I'd always heard 20psi or so at idle after warm. I'm usually around 25 at idle when warm until it oil gets a lot warm and go down to 22-23psi. This is at 700-800rpms on Autometer elec gauge.

[Hijacker]

All of my FSMs state ~11 at idle with no load. SRs run around 46-57 psi at 3200 RPM no load.

You'll see fluctuations depending on what oil viscosity you're using. Thicker oils should cause it to be higher.

[biggie]

All of my FSMs state ~11 at idle with no load. SRs run around 46-57 psi at 3200 RPM no load.

You'll see fluctuations depending on what oil viscosity you're using. Thicker oils should cause it to be higher.

True, have been 10w30 since boost and with 5w30 I was slightly lower.

[asoomal]

11ish at idle.


10 PSI every 1000 RPM.

BTW, don't buy a cheap gauge (which you obviously will) from eBay, it's a good idea to check your oil pressure when taking hard turns and sliding in parking lots in the rain with your mom

[Jagstang]

11ish at idle.


10 PSI every 1000 RPM.

BTW, don't buy a cheap gauge (which you obviously will) from eBay, it's a good idea to check your oil pressure when taking hard turns and sliding in parking lots in the rain with your mom

I already bought 2 guages for my car from Mopac. Got a boost gauge and water temp gauge. It's already all mounted up, and the wires are extended through the firewall to the engine bay.

On topic, for the time being, i'll get the KA oil pressure sensor ($28 at the nissan dealer) and i'll use it for the start up. And after a while, I'll pick up an oil pressure gauge.