Nexsys oil pressure sensor kit

[JohnDaviz]

I looked into this further, this is normal operation and values above atmospheric pressure are correct. Pressure will read ambient until oil pressure exceeds ambient pressure. This is exactly how the system functions on the N/S55. Here's a log from my 2017 M2 where poel_w is the oil pressure. With the engine off oil pressure remains close to ambient, while cranking the pressure increases past ambient. If you are looking to use our kit to verify oil pressure is primed (after say a rebuild) then just ensure it increases while cranking (this applies to stock N/S55's as well since they operate in the same way). BMW states the minimum oil pressure for the N54 at idle (fully warmed up) is 1.5 bar or 21.75 psi and 4 - 6 bar at higher RPM (again, fully warmed up).
View attachment 77263

But it is reading 1 bar when the engine is off. And it is not reducing the 1 bar when reading at operating temp.

Or actual ambient pressure which may vary. It is no substracted as it should.

An oil pressure sensor is supposed to show absolute pressure. Most users will not know that ambient is not substracted.

 

[bahn]

But it is reading 1 bar when the engine is off. And it is not reducing the 1 bar when reading at operating temp.

Or actual ambient pressure which may vary. It is no substracted as it should.

An oil pressure sensor is supposed to show absolute pressure. Most users will not know that ambient is not substracted.

You dont need to subtract it, think of it as the maximum between ambient atmospheric pressure and oil pressure. Below is an example, idle with oil fully warmed up (very important as pressure changes greatly with oil temp). If this value needed ambient pressure subtracted then actual oil pressure would be 24.37 psi - 14.2 psi = 10.17 psi. Remember the minimum oil pressure at idle according to BMW is 1.5 bar or 21.75 psi and this engine is healthy.

Since the N/S55 works in the exact same way and has a sensor in stock form, lets look at it's limits and thresholds;

At 720 RPM & 223 F oil temperature the threshold for alerting is 1515 hPa (you have to perform bilinear interpolation). 1515 hPa = 21.97 psi which is pretty much identical to the N54 minimum oil pressure. There's a lot of people who have logged the N54 oil pressure through other means, typical hot oil idle is in the mid 20's, 24-28 psi and 65-80 psi at higher rpm. Which is exactly what we see on our kits.

 

[Jern54]

It's a matter of what you used to work with.
In my industry (shipping) we are used to work with gauge pressures and in my opinion it is much more convenient to know than absolute pressure.

 

[Jern54]

Oil pressures for N54 fwiw

 

[Jake@MHD]

I don't think you guys are understanding. It is "gauge pressure" once the engine is on.

The reported value is basically MAX(barometer, oil pressure);

So when baro > oil pressure (engine off) you will see it log as such.

 

[Jern54]

That makes sense, thanks for the chime in @Jake@MHD !

 

[gmx]

I received, installed, flashed. Works good.
What I must say is this sensor itself does not look genuine nor OEM. It's aftermarket as even in QTY < 10 you can get them for less than a tenner.

 

[TiAgAu]

I received, installed, flashed. Works good.
What I must say is this sensor itself does not look genuine nor OEM. It's aftermarket as even in QTY < 10 you can get them for less than a tenner.

Possibly. I searched up the part number on https://www.aliexpress.com/w/wholesale-12617592532.html?
Bout a tenner like you said. Plug wouldn't be any more.

 

[Asmo]

I think you guys are jumping to conclusions here on the licensing (especially calling it cartel & illegal). The licenses will be available separately they just aren't on my website yet. I was going to make them available independently for supporting a second hand market since MHD licenses are tied to the vehicle (hence why they are not on the website yet). I'm not sure why you'd want to use a different sensor though as you'll find it's hard to source one in the appropriate thread without using adapters. I guess some people like to spend more money in the long run than just buying the complete kit?

It's been a few months. Can we now buy the license separately?

 

[TiAgAu]

It's been a few months. Can we now buy the license separately?

Arh i didn't see that post. Sounds good! a separate license purchase would be ideal.

 

[SLOWESTN54]

Technically wouldn’t you buy the license from @Jake@MHD

 

[Asmo]

Technically wouldn’t you buy the license from @Jake@MHD

Technically..

 

[JohnDaviz]

Hey guys, Hey @bahn
a friend reported a weird minor issues.

He has Comfort Access if that is an important information. He gets into the car, puts the key into its place and starts the car as anyone does without comfort access. He then gets an active oil pressure light and sometimes a big oil pressure warning check control message for half a second and after that everything is fine.

Anyone else experienced that? Is that a known phenomenon?

 

[Brule]

Anyone have datalogs of a launch from a stand still of oil pressure?

How much does it drop?

 

[E82_jester]

I just recently installed this oil pressure sensor kit on my car almost a week ago. I set my idle to 950rpm due to clutch chatter so idk if that’s why my readings are a bit higher. However at idle (oil cold) I’m seeing about 60-75psi. At idle with the oil up to temp I see 50-60psi. During moderate load I see with oil at temp I see anywhere from 80-100psi. During hard acceleration with oil at temp I’ve seen as high as 110psi for a second. Is this normal or should I be checking for issues?

 

[DirtKurt]

I just recently installed this oil pressure sensor kit on my car almost a week ago. I set my idle to 950rpm due to clutch chatter so idk if that’s why my readings are a bit higher. However at idle (oil cold) I’m seeing about 60-75psi. At idle with the oil up to temp I see 50-60psi. During moderate load I see with oil at temp I see anywhere from 80-100psi. During hard acceleration with oil at temp I’ve seen as high as 110psi for a second. Is this normal or should I be checking for issues?

I'll have to look at kine next time I go out, but from memory that sounds very similar to my readings with fresh 5w40

 

[E82_jester]

I'll have to look at kine next time I go out, but from memory that sounds very similar to my readings with fresh 5w40

I do run liquid moly 5w40 and did an oil change 3days before I put in the sensor.

 

[SlowE93]

Sorry to create all the confusion boys, it just caught my eye hence I thought I'd share it here. This is still in the pre order stage, i assume there will be more info as you get closer to the release date.

INSTIGATOR

 

[Carbonic135]

It's been a few months. Can we now buy the license separately?

Pretty piss-poor response from Nexsys. After initially (December last year) agreeing to sell me just a Licence Austin simply quit responding to my emails. Here’s the reality check: I live in South Africa, so shipping a little bag of off-the-shelf hardware halfway across the world, and then incurring further duties and taxes is an expensive, DUMB idea! If you’re in the game of selling IP, don’t contaminate it with nickel and dime value adds.

 

[Carbonic135]

Pretty piss-poor response from Nexsys. After initially (December last year) agreeing to sell me just a Licence Austin simply quit responding to my emails. Here’s the reality check: I live in South Africa, so shipping a little bag of off-the-shelf hardware halfway across the world, and then incurring further duties and taxes is an expensive, DUMB idea! If you’re in the game of selling IP, don’t contaminate it with nickel and dime value adds.

Update: not sure if my post triggered a reaction, or if it was pure coincidence, but the Licence-only option was added to the Nexsys store shortly after I posted. Bought the Licence, bought an N55 oil pressure sensor, and a minor mod to a PDC plug saw me having all the hardware.
Deciphering the sensor pinouts was a bit of a challenge (got it wrong 1st time), but a pin swap and I’m IN BUSINESS! Really happy with this peace-of-mind upgrade. Licence fee is well worth the R&D value.