If you read the thread on spoolstreet about the Nexsys oil pressure gauge, Jake from MHD mentioned. "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." I monitor with a nexsys setup aswell. I noticed an interesting change as i changed my oil today when i switched to Castrol Edge 5w-40 the new SP formulation, car was up to temp bout 115C oil temp and the oil pressure is up to 38-39 PSI on idle. Now i've never seen this at idle before with other brands eg, Nulon, Liqui Moly Molygen, Vavloine, are all around 34psi once to temp. All oils are 5w40 so what do you think this means? i think on paper the castrol edge is thinner at temp but yeah i'm not sure. Good work btw keep it up.
@@strizap Thanks. I went and found the spool street thread where Jake made those comments, but I’m not confident he is correct. It’s either a “absolute pressure sensor” or it’s a “gauge pressure sensor” but it can’t be both. Hydraulic pressure systems (eg, engine oil pressure, fuel pressure, etc) should use a gauge pressure sensor. The software could make an adjustment but you would logically deduct this from all readings, including when the engine is off. I am 99% sure the DME can’t do that calculation and if MHD logging is not active before you start the engine then they wouldn’t know what barometric pressure to deduct. I need to hook up my manual test gauge (reads 0psi when engine off) and check the differences when engine is running. I don’t have a suitable t-piece so it’s not an easy task
Nexsys are useless. I’m still waiting for a response on a different issue. MHD are more likely to address it, and that’s where it probably needs to be done anyway.
from my exp, liquimoly 5-30 to 5-40 the oil temp dropped atiny bit on n54 also but when it aged it went as before, so you saying the crank and rods holds the heat abit with the heavy weight oils? i don't think that's good specially in hot climate am in one actually 🥲
If you read the thread on spoolstreet about the Nexsys oil pressure gauge, Jake from MHD mentioned. "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."
I monitor with a nexsys setup aswell. I noticed an interesting change as i changed my oil today when i switched to Castrol Edge 5w-40 the new SP formulation, car was up to temp bout 115C oil temp and the oil pressure is up to 38-39 PSI on idle. Now i've never seen this at idle before with other brands eg, Nulon, Liqui Moly Molygen, Vavloine, are all around 34psi once to temp. All oils are 5w40 so what do you think this means? i think on paper the castrol edge is thinner at temp but yeah i'm not sure.
Good work btw keep it up.
@@strizap Thanks. I went and found the spool street thread where Jake made those comments, but I’m not confident he is correct. It’s either a “absolute pressure sensor” or it’s a “gauge pressure sensor” but it can’t be both. Hydraulic pressure systems (eg, engine oil pressure, fuel pressure, etc) should use a gauge pressure sensor. The software could make an adjustment but you would logically deduct this from all readings, including when the engine is off. I am 99% sure the DME can’t do that calculation and if MHD logging is not active before you start the engine then they wouldn’t know what barometric pressure to deduct. I need to hook up my manual test gauge (reads 0psi when engine off) and check the differences when engine is running. I don’t have a suitable t-piece so it’s not an easy task
you should contact them to make the psi change in the mhd software
Nexsys are useless. I’m still waiting for a response on a different issue. MHD are more likely to address it, and that’s where it probably needs to be done anyway.
@@DarkePeak yes thats what i meant. great video thank you
@@DarkePeak Check my other comment on here. Cheers
@@DarkePeak Nexsys is run by one of the MHD developers, so one and the same
I use an accusump (oil accumulator with an electric valve) to get the same job done :)
That’s what I wanted but no room for it in the engine bay and not allowed to have it in the cabin.
from my exp, liquimoly 5-30 to 5-40 the oil temp dropped atiny bit on n54 also
but when it aged it went as before,
so you saying the crank and rods holds the heat abit with the heavy weight oils? i don't think that's good specially in hot climate am in one actually 🥲
The heavy oil is going to be worse at removing heat from engine bearings.