pogman

Ok interesting i guess ill wait till using a manual gauge before making assumptions.

So didn't get around to installing a manual oil pressure gauge and then decided to take the car for a cruisey drive to a cars and coffee and brought the laptop along with to get another log using more gears to see if its an oil pressure issue under acceleration or after. this log has 3 gears of WOT where as previous had 2 and the oil pressure dropped once on the brakes, and the same again happens here which is interesting as it shows it can hold oil pressure while under acceleration but once slowing or just the lower RPM after a pull pressure drops. I will be chucking a manual oil pressure gauge on to confirm but so far this makes me feel it is not an electrical issue. Something else i realised is the pressure sensor also is giving temperature information and the temp stays steady the whole time which makes me feel like the sensor itself is showing a true pressure reading.

Poncam the world

yes sorry i should of spoke better, all sensors are grounded into their specific homes in the ecu, the ecu is then grounded to the chassis itself along with the EFI relay.

Gday mate, Personally in my car i run 450kw in an s2 rb25 so also hydraulic lifters and have always run it to 7500 RPM and using some baby 256 poncams with new but stock springs and retainers. While i cant speak on any experience with solid lifters i personally have had no issues with my hydraulic lifters which were just cleaned and set in an oil bath before assembly over 7 years ago. Over 8k RPM is cool IMO and if you are using the stock gearbox or just a box with longer ratios the higher rpm certainly could aid to maintain boost into the next gear as that was always something i struggled with as i have a 3582r also but a hypergear equivalent could aid that issue. In summary i would make a choice on the cam you want to use first then decide which springs and retainers work best with it and then you can toss up if you really need the solid lifters, if the car is mainly street i would learn towards keeping the hydraulic lifters as when installed properly and nothing too hektik going on around them they do the trick.

All of the ECU grounds are to the chassis, the IGN grounds are to the cylinder head and i believe all the OEM body harness are left in original locations, im trying to work out if i can tell if the sensor voltage itself is losing any power to it from the very low ECU voltage. But yeah a manual pressure gauge will help in picking which path to actually chase. Also please dont bully my wiring plan i never designed it to be universally understood hopefully it still can make sense to you, im a wiring virgin. 1 thing i have just noticed the pressure sensor in question relays both pressure and temperature, the temperature reading holds nice and steady despite the low ecu voltage but the pressure reading is the one that jumps around alot so maybe it is really a pressure issue? wiring plan.xlsx

Unfortunately I'm a Gen Z (Don't hold it against me pls) but I'm also retarded so surely they cancel out? But yes definitely agree where else can you find people helping and bullying each other for the past 20+ years with a sprinkle of "hottest girlfreinds or wives of sau" in there too for some downtime after all the learning.

That sounds way too sensible, I may need to dumb it down before I try it.

I much prefer that to an actual oil pressure issue, never would of thought it would of been a volt drop issue but SAU brains win again. Guess ill be turning down the oil pressure limit for the track and hunting some grounds. Ill hopefully update this thread with some high oil pressure and solid ecu voltage logs.

i cant get them all in 1 screenshot unfortunately as i just dont know how to move things around tbh, but they are all from the same log and the line crosses at the same point for all of them

Think ill be going hunting for bad earths and might just replace the alternator for shits n gigs as its an LS alternator but only about 5 years old with very minimal use in that 5 years.

more sensors sounds very smart least you never doubt a single sensor. it has dropped about 10 psi at a 5k rpm low load shift but regains it in a normal way, not showing like a quick blip on the chart but more presenting as like a build up of pressure again. unlike the 8k rpm high load shift which shows a quick up and down spike on the oiul pressure graph.

its certainly looking like a power issue now which im all for so i can test turn the limit off for the upcoming track day i was hoping to make ahahahah

i only have ecu voltage available but that certainly does drop as that still relies on the 27 year old wiring, although has an ls altenator that pump out 140 amps and wiring upgraded to suit that. i will test the sensors without it running soon thats a good one. it an emtron kv8, i recently redid the engine side harness so i have my own wiring guide for it but i had the same issues when i used the plug and play kit that was adapted to suit my old vipec adapted harness

im surpirsed a halaltech doesnt show that. this scatter is from a 45 second long log