If you can, Please post back here how the oil pressure tables i provided work.Originally Posted by AvilaLSX
They currently only have a few people using them other than myself and may still have a couple kinks or clarifications to add
Good bad or ugly,
I dont have any secret information so everything i have found thus far is from digging and sifting and some educated guessing
Ok so I got to spend some time testing out changes to these tables while I tuned the car. This is a dry sump lt1 corvette gs. It has TSP el c7 cam and BTR trinity intake and more. 12.5:1 compression. This is the second one I?ve seen that sat in the 40-50psi range at higher rpm. Did it stock before mods and after.
When I look at the high and base pressure tables, it seems it is what GM is commanding. I believe the high and low desired tables are models GM engineers set up for the ECU to know what to expect from this pump at different RPM & oil temp.
On the base/High tables I changed the rpm axis to extend up to 7500 rpm and commended the high side to get into the 70 psi range. It is not able to match what I am commanding. The oil pressure fluctuates worse as it tries to. It will hold the 45psi steady. Gets as high as 55 and fluctuates to 50-55.
What did work well was using the torque enable/disable settings. I can see an immediate spike to the high side at my requested torque.
The minimum table is set to like 2psi. I bumped it to 10 but I have not done enough testing to know how this table applies. If it is just a minimum to trigger an oil light? Idk.
I sent the tune with the oil pressure base/high tables back to stock values, but torque set to enable high pressure in the 4500/5500 rpm cells.
Thank you for the detailed feedback here.
I appreciate the feedback that the oil pressure torque control tables work as expected, it was a long shot in the source to link them to engine torque.
I agree with you on the base and high desired tables, They appear just to give the ECM an idea of where the oil pressure should be.
The minimum table I have recently been calling the threshold table. In my experiments if you set the values in the table high (600kpa) ish, you should see the oil pressure switch to high mode in the cels you choose.
I have had multiple customers very happy with just this table before i identified the other ones.
Interesting...I had my LT1 rebuilt, DOD/VVT delete, but left the OEM stock oil pump. It is variable and it runs low pressure during lower RPMS. They go as low as 10-15 PSI during low RPMs.
Wondering if this could be tuned so it doesn't run so low pressure? Is that possible or am i mistaken about this post?
Thanks,
Pjs
For a long time now I have wanted access to oil pump tables to see GMs strategy. Thank you for making that possible. It seems like they are all reluctant to go to the high side IMO. I should?ve asked about the minimum table ahead of time to try that before sending the car. I did see your explanation in earlier posts but I didn?t make sense of it myself at that time.
Look forward to testing more on future cars with all the extra tables you have to offer.
Maybe the motor was setup loose on clearances. Aluminum blocks tend to ?open up? more as they get warmed up. That is why the big split in these modern 0w40/5w50 oils (my opinion). Hopefully it shoots up with RPM. Maybe try a thicker oil. Maybe your builder already recommended something. 5w50 mobil1 supercar might be worth a shot.
He did recommend thicker oil. I've been running 15w-50 ever since. Pressure does go up with RPMs, typically steady around 40 PSI. I'm just nervous about it being so low at idle and low RPMS, e.g. what if I decide to floor it, will pressure come up quick enough one day....
Pjs
I just rebuilt a l83 with ls7 lifters and it seems to have some lifter noise when it’s in I would assume the low pressure table when I unplug the solenoid motor runs quite as a mouse. Where do i go to get access to those tables?
Recently HPT added oil pressure control tables to VCM editor.
They got the Engine Torque Enable and disable correct
[ECM] 28332 and [ECM] 28333
However, their implementation of the High,Low tables is incorrect.
[ECM] 26410
[ECM] 26411
It is offset by half a row.
Screenshot 2025-04-30 102900.png
HPT does not yet have the Minimum oil pressure Threshold table defined
They have enough for you to confidently use trq based controls to switch the oil pump into high mode.
However, until they add the table, they do not have the table to switch the oil pump into high mode based on engine rpm and temperature.
Note to HPT: I am happy to help you help the community by getting these tables defined correctly.
Please feel free to reach out and we can discuss.
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