What is your hot idle oil pressure in your ZL1 (LT4)?

nighttowl · 05-22-2021, 10:37 PM

What is your lowest hot idle oil pressure in your ZL1 (LT4)?

SSallday · 05-23-2021, 12:08 AM

28-30 is normal. The engineer’s response to your issue is bs. They want to avoid replacing your pump because it’s a big expense. I bet they are hoping it fails after the warranty is up. If 20 psi was normal then all ZL1s should be running 20psi.

LT4Greg · 05-23-2021, 08:39 AM

Mine tends to fall between the 20 and 30 marks on the gauge when hot idling. It varies but seems to be around 21 to 22 maybe. Mine was built April 10, 2017.

Trak-Toy · 05-23-2021, 08:46 AM

29 psi is lowest I’ve seen with oil temps at 260* after hard driving runs. Build date, January 29th, 2018.

LiqTenExp · 05-23-2021, 10:02 AM

Average of a 5 min log is 32.8 psi @ 180°C using 0-40w Mobil 1 and PF64 filter. Looking around in other logs I see ~30-31 psi @ 200°C at idle

I peak at about 65 psi at 7k rpm

avalonandl · 05-23-2021, 10:31 AM

2019, my build date is Dec. 2018.

LiqTenExp · 05-23-2021, 10:54 AM

If the pressure (psi) goes below these levels it will set the oil pressure light

nighttowl · 05-23-2021, 11:10 AM

Quote:

Originally Posted by LiqTenExp

If the pressure (psi) goes below these levels it will set the oil pressure light

this is awesome because according to GM the minimum oil pressure at 1000 RPM is 22 psi.
the oil light comes on at 25% of that...

LiqTenExp · 05-23-2021, 11:18 AM

I actually have not tested this table, just was digging around in HPT, I "assume" it is correct. It is from a LT4 ZL1.

collinms · 05-23-2021, 01:24 PM

Make sure your idle isn't dropping. Mine will randomly dip lower at idle and then the oil pressure goes down to like 27—28.

Scottyz · 05-23-2021, 01:48 PM

Ok so first off please don’t think I’m trying to argue or make excuses for GM because I’m not. I hope you don’t have an issue with your pump that’s for sure.
But I wanna bring this to light as maybe I’m not seeing what you guys are. Also I’ve been a licensed tech for about 25 years and have worked on a very large array of cars and heavy equipment and very specialized equipment so I’m confident I have some knowledge on the subject.
Anyhow, from what i read in the other post it says GM says anything below 22psi at 1000rpm is a low limit. Ok, so at idle you are at 21psi. Idle to myself would be about 650rpm roughly say give or take 50 rpm. So if you look at your oil psi at 1000rpm I bet it bumps up probably well over 22psi. You might wanna check and see. Your pump may very well be fine. And again I could be wrong and maybe it doesn’t bump up at which point I’d be definitely concerned.
Again, please don’t think I’m against you in any way. Trust me I’m on your side. Just thought I’d bring to light what has been written in the other thread and that maybe your pump is actually healthy.

nighttowl · 05-23-2021, 01:57 PM

Quote:

Originally Posted by Scottyz

Ok so first off please don’t think I’m trying to argue or make excuses for GM because I’m not. I hope you don’t have an issue with your pump that’s for sure.

Understandable, but a car doesnt lose 30% of its hot idle oil pressure in 200 miles if nothing is wrong.

I changed the oiil to 15w50, did a HPDE and the idle pressure went down. I changed the oil back to 5w-30, and the pressure did not come back.

Scottyz · 05-23-2021, 02:16 PM

Hmmm. I must have missed the part of you putting the thinner oil back in and the pressure not coming back up. That is concerning I agree.
I have a machine at work that is a road grinder. We switched to running 10W30 in our equipment a few years ago. When this grinder is worked really hard the oil pressure warning will come on and will flicker the oil light. We have put mechanical gauges on it numerous times to monitor and it’s still safe as per the manufacturer which is Cummins. Yet we switched it back to 15W40 and no more issue with the exact same working conditions.
I would have, much like yourself I’m sure, figured if the pressure went down with the 15w50 it would have come back up with the 5w30. Sounds to me like, without looking this up right now but I think I’m correct in my thinking regarding this specific LT4 oil pump, that the solenoid or whatever they use to stroke the pump for more oil psi, isn’t functioning correctly. This is my first thoughts off the top of my head while I’m chilling on a nice day enjoying a beer.

Scottyz · 05-23-2021, 02:19 PM

Or the pump is cracked like the others.

View Poll Results: What is your hot idle oil pressure in your ZL1 (LT4)?
less than 20	1	2.27%
20-25	2	4.55%
25-30	23	52.27%
30-35	14	31.82%
35+	4	9.09%
Voters: 44. You may not vote on this poll

05-22-2021, 10:37 PM	#1
nighttowl Sarcasm loading -------- Drives: 2018 ZL1 1LE Join Date: Dec 2011 Location: TX Posts: 1,805 View My Garage	What is your hot idle oil pressure in your ZL1 (LT4)? What is your lowest hot idle oil pressure in your ZL1 (LT4)? __________________ "The salesman actually told me to stop getting it sideways during the test drive" 2018 MBM ZL1 1LE - Stock 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD

05-23-2021, 08:39 AM	#3
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,811	Mine tends to fall between the 20 and 30 marks on the gauge when hot idling. It varies but seems to be around 21 to 22 maybe. Mine was built April 10, 2017. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

05-23-2021, 10:02 AM	#5
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	Average of a 5 min log is 32.8 psi @ 180°C using 0-40w Mobil 1 and PF64 filter. Looking around in other logs I see ~30-31 psi @ 200°C at idle I peak at about 65 psi at 7k rpm __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93) Last edited by LiqTenExp; 05-23-2021 at 10:18 AM.

05-23-2021, 10:31 AM	#6
avalonandl Drives: 2019 ZL-1 Join Date: Feb 2009 Location: Troy, MI & Naples, FL Posts: 2,019	2019, my build date is Dec. 2018. __________________ 2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles... 2012 Yukon XL Denali w/ 6.2 AWD

05-23-2021, 12:08 AM	#2
SSallday Drives: ‘18 ZL1 / ‘22 ZLE Join Date: Oct 2013 Location: PA Posts: 584	28-30 is normal. The engineer’s response to your issue is bs. They want to avoid replacing your pump because it’s a big expense. I bet they are hoping it fails after the warranty is up. If 20 psi was normal then all ZL1s should be running 20psi.

05-23-2021, 08:46 AM	#4
Trak-Toy Drives: 2023 SS 1LE Join Date: Mar 2020 Location: Virginia Posts: 270	29 psi is lowest I’ve seen with oil temps at 260* after hard driving runs. Build date, January 29th, 2018.

05-23-2021, 10:54 AM	#7
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	If the pressure (psi) goes below these levels it will set the oil pressure light Attached Images __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)

05-23-2021, 11:18 AM	#9
LiqTenExp Drives: 2017 ZL1 Join Date: Jan 2017 Location: NJ Posts: 905	I actually have not tested this table, just was digging around in HPT, I "assume" it is correct. It is from a LT4 ZL1. __________________ 2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)

05-23-2021, 01:24 PM	#10
collinms Drives: 2017 ZL1 A10 Summit White Join Date: Apr 2018 Location: Cumming, Georgia Posts: 511	Make sure your idle isn't dropping. Mine will randomly dip lower at idle and then the oil pressure goes down to like 27—28.

05-23-2021, 01:48 PM	#11
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	Ok so first off please don’t think I’m trying to argue or make excuses for GM because I’m not. I hope you don’t have an issue with your pump that’s for sure. But I wanna bring this to light as maybe I’m not seeing what you guys are. Also I’ve been a licensed tech for about 25 years and have worked on a very large array of cars and heavy equipment and very specialized equipment so I’m confident I have some knowledge on the subject. Anyhow, from what i read in the other post it says GM says anything below 22psi at 1000rpm is a low limit. Ok, so at idle you are at 21psi. Idle to myself would be about 650rpm roughly say give or take 50 rpm. So if you look at your oil psi at 1000rpm I bet it bumps up probably well over 22psi. You might wanna check and see. Your pump may very well be fine. And again I could be wrong and maybe it doesn’t bump up at which point I’d be definitely concerned. Again, please don’t think I’m against you in any way. Trust me I’m on your side. Just thought I’d bring to light what has been written in the other thread and that maybe your pump is actually healthy.

05-23-2021, 02:16 PM	#13
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	Hmmm. I must have missed the part of you putting the thinner oil back in and the pressure not coming back up. That is concerning I agree. I have a machine at work that is a road grinder. We switched to running 10W30 in our equipment a few years ago. When this grinder is worked really hard the oil pressure warning will come on and will flicker the oil light. We have put mechanical gauges on it numerous times to monitor and it’s still safe as per the manufacturer which is Cummins. Yet we switched it back to 15W40 and no more issue with the exact same working conditions. I would have, much like yourself I’m sure, figured if the pressure went down with the 15w50 it would have come back up with the 5w30. Sounds to me like, without looking this up right now but I think I’m correct in my thinking regarding this specific LT4 oil pump, that the solenoid or whatever they use to stroke the pump for more oil psi, isn’t functioning correctly. This is my first thoughts off the top of my head while I’m chilling on a nice day enjoying a beer.

05-23-2021, 02:19 PM	#14
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	Or the pump is cracked like the others.

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