oil pressure question
#1
TECH Fanatic
Thread Starter
Join Date: Jan 2011
Location: Michigan
Posts: 1,358
Likes: 0
Received 0 Likes
on
0 Posts
oil pressure question
So when the trans was out we noticed a leak by the opsu. So we replaced it. Before with the stock opsu my pressure would be in the norm 48-34 cold/hot. Now while driving its 40/or 35 but when I come to a stop and idle it drops to 25/20. Should I worry? replace? or leave it for now?
#3
There are two points at discussion here which should not confused with one another: first, what the optimum oil pressure is, and two, what your oil pressure actually is. Since your pressure dropped immediately after replacing the unit, it is logical to assume that the higher pressure was your actual pressure (since damaged units will only operate at lower efficiency) and that your new readings are inaccurate. You can have your actual pressure tested at any professional shop for a very reasonable fee or you can do it yourself with the proper equipment.
Concerning optimum oil pressure, my past research has led me to understand that, with these cars, the pressure level will vary per many different variables, i.e. bearing tolerance, oil grade, filter brand, oil pump condition, efficiency of cooling system, etc. Thus, it can never be said that your pressure 'must' be this or that, but rather determining whether your pressure is appropriate for the collective circumstance of your vehicle.
Concerning optimum oil pressure, my past research has led me to understand that, with these cars, the pressure level will vary per many different variables, i.e. bearing tolerance, oil grade, filter brand, oil pump condition, efficiency of cooling system, etc. Thus, it can never be said that your pressure 'must' be this or that, but rather determining whether your pressure is appropriate for the collective circumstance of your vehicle.
#4
TECH Fanatic
Thread Starter
Join Date: Jan 2011
Location: Michigan
Posts: 1,358
Likes: 0
Received 0 Likes
on
0 Posts
That's kinda the conclusion I came up with. All I know is before it would for the most part run at 38-42 no matter the temp , idle, or accelling. Now it runs 25 at idle and 40 during crusing. Some threads say its normal, some say its not. If the 10lbs/1000 rpm rule is still in effect I should be fine.
#6
10/1000, or ive also seen 20/hot idle is when you start worrying.
Mine is around 55 cold idle, 38-42 hot idle, cruising at 1000rpm or so its at around 40-42, and cruising at 2200rpm or so is between 50-60
Mine is around 55 cold idle, 38-42 hot idle, cruising at 1000rpm or so its at around 40-42, and cruising at 2200rpm or so is between 50-60
#7
On The Tree
Join Date: Jan 2003
Location: United States
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
I'm getting the twitchy needle on my oil pressure gauge when I'm sitting idle at a light. The pressure isn't too low (sits just above 40psi), but the twitch annoys the hell outta me.
Trending Topics
#8
TECH Fanatic
Thread Starter
Join Date: Jan 2011
Location: Michigan
Posts: 1,358
Likes: 0
Received 0 Likes
on
0 Posts
IDK...I had left the shop knowing it needed to be replaced. I figured it was the oem gm version they were replacing it with. But it was another brand, supposed to be a better one. It cost 60$ and I forgot the name of it. I'm slightly pissed..I'm wondering if the new unit is too much. I'm gonna wait until this cam install is done this week and see if the problem persist. If it does, they can replace it with the oem gm opsu. It just never dropped off to 20-25 before the new unit. And its only 45 degrees out.
#9
Save the manuals!
iTrader: (5)
I'd check the brand. I went with an off brand and the new one read low and was jittery. After putting in a GM unit, life has been much better:
https://ls1tech.com/forums/general-m...ding-unit.html
https://ls1tech.com/forums/general-m...ding-unit.html
#10
TECH Fanatic
Thread Starter
Join Date: Jan 2011
Location: Michigan
Posts: 1,358
Likes: 0
Received 0 Likes
on
0 Posts
I'd check the brand. I went with an off brand and the new one read low and was jittery. After putting in a GM unit, life has been much better:
https://ls1tech.com/forums/general-m...ding-unit.html
https://ls1tech.com/forums/general-m...ding-unit.html