Oil temp gauge plumbing

Eoinmack

Eoinmack

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Right lads, I've new gauges in the car with a few months. Everything works, but oil temp gauge isn't getting a reading from the oil.
The gauge is working, the sensor is working, as the gauge will read ambient engine bay temp when the car is idling parked up. So temp will hit 50 or 60 degrees when it's parked for 10 mins or so, but as soon as you start driving, the air flow cools the little block the sensor is in and it drops down to the bottom of the gauge again.
Its plumbed in, with the pressure sensor, under the intercooler.
Is the temp gauge better to be plumbed with a sandwich plate at the oil filter?
I think it's just not getting oil flow through the hose to the sensor1000020773.jpg
 
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unless there defi gauges and sensors your wasting your time as there just there to look good . There’s a reason they’re twice the price of others. .
Ambient air is not cooling it it that much other wise it would become the cheapest oil cooler in history
 
So normal operating temp would be 80-100deg without a separate oil cooler

What brand of gauge you using?
 
It's prosport gauges.
Everything works, pressure, water, boost etc
The oil temp gauge is working.
It's on, it's measuring engine bay temp I reckon, lowest reading is 50 degrees. When idle, and engine bay gets warm etc, gauge will creep up to 60 or 70 degrees, as the little block the sensor sits in gets hot. As soon as you start driving, it starts to drop down again as air flow gets around it, and it feels cooler to touch too.
It's not huge accuracy I'm looking for lol but they're not reading wrong by 50 degrees lol
I think there's no oil going up that hose so nothing there for the sensor to read if you get me
When car is fully warm, oil pressure reads just under two bar, and nothing in temp gauge... Unless I'm parked lol
 
scoobysub said:
unless there defi gauges and sensors your wasting your time as there just there to look good . There’s a reason they’re twice the price of others. .
Ambient air is not cooling it it that much other wise it would become the cheapest oil cooler in history
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It's not cooling the oil, sorry, I probably wrote that wrong. The airflow is cooling the sensor, therefore bringing the temp reading down on the gauge lol
 
Like, this item gets physically cooler to touch after driving compared to when it's parked and ticking over... If you get me. 1000020818.jpg
 
They are reading wrong of operating temp is 90 degrees usually 😂😂

The sensor should still reading the temperature of the fluid inside the block
 
BazGF8 said:
They are reading wrong of operating temp is 90 degrees usually 😂😂

The sensor should still reading the temperature of the fluid inside the block
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That's exactly what I'm saying tho. There's no fluid in the block lol
Sensor is bone dry. It's not getting oil through the hose.
So when the car is parked up but ticking over, the temp will slowly rise with the ambient air temp in the engine bay, but then when your driving the air flow cools the little block if you get me
 
If it’s reading oil pressure on the same block but no oil temp then it’s your sensor
 
I've bought and fitted a new sensor and still the same.
It's reading some temperature, like I said, if it's parked and ticking over, engine heat will make that little block hot, and therefore the sensor will read a temperature and the gauge will rise.
It's oil flow is the problem. It's reading air temp lol
 
BazGF8 said:
Wtf ?
Where abouts on the block is the take off point?
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If you mean where the hose is plumbed, there's a little bung above cylinder 4 that people say to use, right beside turbo, so I've that hose connected in there. But I don't see how the oil is gonna go up that hose to the sensor in order to take a reading if you get me
 
Eoinmack said:
If you mean where the hose is plumbed, there's a little bung above cylinder 4 that people say to use, right beside turbo, so I've that hose connected in there. But I don't see how the oil is gonna go up that hose to the sensor in order to take a reading if you get me
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Oh it will but I get you , nearly like an air lock , what’s used to seal the threads ? Could be blocking oil flow
 
BazGF8 said:
Oh it will but I get you , nearly like an air lock , what’s used to seal the threads ? Could be blocking oil flow
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Just thread tape? I bought a new hose aswel, I had a braided steel one, and that kind of bulged just before the sensor unit, so bought that rubber one now and same story.
It was also mounted up beside the turbo inlet before, bracketed to the drivers side intercooler bracket, and thought then that having it sitting above the turbo might have caused the bulge on the braided line, so moved it then when I got the rubber hose and now mounted it where the pic is above.
Is that the proper spot to plumb them into?
Like, I've had prosport in the WRX and they did work... Including oil temp

Yes they won't be as accurate as Defi or something but like I said, they're not gonna be 50 degrees off lol
Regardless of the accuracy of the gauge, like if the pressure gauge drops to zero, something wrong 😅

I did compare the few values to the OBD reading when installing. Not bang on accurate, but close.
Boost gauge reads exactly what AP had on his system. And the water temp gauge does look to be about 1 or 2 degrees off what OBD says. But still close enough for what they cost.

Just can't get this to take a reading. If it would be better to plumb elsewhere, then so be it. But I'd be 99% sure it's not getting oil down to the sensor the way it currently is

I had a video in the old phone, it was ticking over for about 30 mins, oil temp gauge was reading about 65 or 70, and I sat in, started driving, and within 30 seconds it dropped down to the bottom of the gauge again.
So it was reading the temperature of the little steel block the sensor is in, and not reading the oil as there probably wasn't any getting to it

I'm very bad to explain things 🤣😅
 
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scoobysub said:
But the block that both sensors are in is showing perfect oil pressure
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Yeah, works perfect. Always starts off in around 5 or 6 bar when cold, and when hot, drops down to just under 2 bar.

This photo here, the three gauges in the middle pod.. Left is water temp, middle is oil pressure, right is oil temp, and on the pillar is boost.
The car was ticking over a good while, pressure has dropped down to just below 2 bar, and temp is reading about 60 or 65 here.

Sorry for blurry pic..
As soon as I started driving, temp dropped down to the bottom again, so it must be picking up the heat from the engine bay itself, but not getting any oil flow to get the temp of the oil. So the gauge and sensor must be working as it does pick up a reading, just not from the oil. That block the sensor is in, that gets hot when the car is ticking over.
Is it better to put temp sensor to a sandwich plate on the oil filter? Then oil will drop down to it rather than go upwards through a hose and into the sensor unit...?
Does that make sense
1000012469.jpg
 
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