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Old 07-20-2006, 04:04 PM   #1
WRXINTX
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Default What oil pressure is excessive for a SUPER HIGH HP 2.5L?

hello all....

I have what I think is excessive oil pressure, but I am wondering if I should mess with it or just leave it alone.....

I run a mix of DELO 400 40W with 25% Lucas oil treatment added for extra protection..... and it is 105 degrees right now where I live in Texas.....

The car starts cold at 120psi of oil pressure... once fully warmed up, it idles at 85psi.... and when I am driving, it runs at 110psi at 3500rpm....

It has an ARC oil pan and I run a remote filter mount setup with a K&N oil filter that holds about one quart, so my system capacity is about 6.5 quarts total....

It never knocks or has any problems really associated with oil pressure.... but the gauge being pegged out kinda is different than what I am used to seeing....

I have heard that these engines like lots of oil pressure to keep them safe... I just don't know how much???

Thanks!
RYNO
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Old 07-20-2006, 04:41 PM   #2
neversatisfied
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Your oil pressure is quite a bit higher than I have seen mine. What kind of gauge are you using for oil pressure?
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Old 07-20-2006, 04:45 PM   #3
WRXINTX
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Quote:
Originally Posted by neversatisfied
Your oil pressure is quite a bit higher than I have seen mine. What kind of gauge are you using for oil pressure?

Nexxus autometer.....

It pegs the 100 psi scale most of the time....

I am probably going to put a mechanical oil pressure gauge on it to test the accuracy of the nexxus....

just to be sure.....

I dunno tho??
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Old 07-20-2006, 05:03 PM   #4
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On cold start, I idle at 90psi. Once warmed up, I idle at 20psi. And cruising along, I vary between 60-75psi.
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Old 07-20-2006, 05:26 PM   #5
kevinh211
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i have the nexus oil pressure gauge
when the car is warm my idle pressure is 20-30psi and crusing its at 80psi
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Old 07-20-2006, 06:25 PM   #6
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Location of the Sensor?
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Old 07-20-2006, 07:55 PM   #7
White 2.5rs
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ditch the lucas

i read a long thing showing it increases emulsion of air and oil by like 40%
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Old 07-21-2006, 10:11 AM   #8
WRXINTX
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Quote:
Originally Posted by Token-Negro
Location of the Sensor?

front of the block right above the crank position sensor
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Old 07-21-2006, 10:13 AM   #9
WRXINTX
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Quote:
Originally Posted by White 2.5rs
ditch the lucas

i read a long thing showing it increases emulsion of air and oil by like 40%
I will consider that next oil change in a few weeks probably...

I have had really great luck with Lucas products in the past on many of my race engines though... so I thought I would use it in my race suby....
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Old 07-21-2006, 10:16 AM   #10
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Quote:
Originally Posted by SloRice
On cold start, I idle at 90psi. Once warmed up, I idle at 20psi. And cruising along, I vary between 60-75psi.
that's pretty much normal.
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Old 07-21-2006, 11:24 AM   #11
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I have a heavily modified 2.5, running a 22T oil pump....100-90 psi cold at idle; 60 psi hot at idle; 90 psi hot cruising; and 120-125psi hot under heavy load. Idle=1200 rpm. Hot=~190-220F oil.
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Old 07-21-2006, 11:53 AM   #12
WRXINTX
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Quote:
Originally Posted by jiml
I have a heavily modified 2.5, running a 22T oil pump....100-90 psi cold at idle; 60 psi hot at idle; 90 psi hot cruising; and 120-125psi hot under heavy load. Idle=1200 rpm. Hot=~190-220F oil.

more like mine sounds like!!!!

cool....

thanks!!!!
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Old 07-21-2006, 12:25 PM   #13
Master2192
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Quote:
Originally Posted by White 2.5rs
ditch the lucas

i read a long thing showing it increases emulsion of air and oil by like 40%
I agree, read this.

http://www.bobistheoilguy.com/images/lucas/lucas.htm
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Old 07-21-2006, 12:41 PM   #14
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Quote:
Originally Posted by WRXINTX

I run a mix of DELO 400 40W with 25% Lucas oil treatment added for extra protection..... and it is 105 degrees right now where I live in Texas.....
40W will increase the oil pressure. That could be the reason you are seeing higher pressure than what everyone has stated here. Is it 10W-40 or straight 40W?

TMS
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Old 07-21-2006, 04:07 PM   #15
WRXINTX
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straight 40w...... which I realize is one way to make super high oil pressure....

I run a single viscosity oil to reduce viscosity break-down at high oil temps....

always run it in my race turbo engines of other brands with similar tolerances....

seems to slow oil usage too.....
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Old 07-21-2006, 05:03 PM   #16
neversatisfied
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Quote:
Originally Posted by SloRice
On cold start, I idle at 90psi. Once warmed up, I idle at 20psi. And cruising along, I vary between 60-75psi.
Ditto. Right around there. A little higher once warmed up, but only like 5 psi more.
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Old 07-24-2006, 05:51 AM   #17
STimo
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^I run basically the same as stated above, give or take 5 psi.
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Old 07-24-2006, 06:39 AM   #18
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Quote:
Originally Posted by WRXINTX
straight 40w...... which I realize is one way to make super high oil pressure....

I run a single viscosity oil to reduce viscosity break-down at high oil temps....

always run it in my race turbo engines of other brands with similar tolerances....

seems to slow oil usage too.....
Not a lot of subie guys run that thick of oil. Never mind a single viscosity.
The 40W+upgraded pump is probably why you are seeing pressures higher than most people report. Next oil change try going down to a 30W and I bet your pressures will come closer to what is considered "normal".

TMS
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Old 07-24-2006, 02:11 PM   #19
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TMS you still run 40w? I've been using 10w40 in the summers and 5w30 in winters. I see the same pressures more or less.
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Old 07-24-2006, 02:28 PM   #20
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Keep in mind that if you are running thicker oil, you NEED increased oil pressure to maintain oil flow at the bearings, so the higher oil pressure is normal. Even with the higher oil pressure, actual oil flow rate is lower with a 40wt oil than a 30wt oil.

BTW, hot (212F) oil pressure will be the same whether you are running a 0w40, 5w40, 10w40 or a straight 40. But cold oil pressure will be MUCH higher with the single weight. I'm sure the OP already knows, but cold straight 40wt oil is very hard on the engine, it is even more important to keep revs and boost down until the oil is warmed up so the pump can move it through the engine.

Finally, oil pressure varies directly with RPM, engine load does not change oil pressure.
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Old 07-24-2006, 03:10 PM   #21
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Quote:
Originally Posted by cdvma
TMS you still run 40w? I've been using 10w40 in the summers and 5w30 in winters. I see the same pressures more or less.
I use 10/40 in the winter and have switched to 20/50 for the summer all diino. I just don't like how thin a synth of the same weight is.
If I ge arround to putting in an oil cooler then I will go back to the 10/40 year round.

TMS
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Old 07-24-2006, 06:01 PM   #22
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Quote:
Originally Posted by TheMadScientist
I use 10/40 in the winter and have switched to 20/50 for the summer all diino.
Ditto, until the built motor gets about 5-6K on it - from then on it'll be 10w-40 and 15w-50, synthetic. 5w-30 looks and feels like colored water at this time of the year, and I live at 4,000'.

My pressure numbers are very similar to Slorice's numbers.
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Old 07-25-2006, 12:09 PM   #23
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Quote:
Originally Posted by drees
Finally, oil pressure varies directly with RPM, engine load does not change oil pressure.
Unless you are trying the "ring-land delete mod" on a couple of pistons.

And to chime in my #s :

5w 30 winter/ 10w 30 summer. Not a rediculous power house but well over stock. My pressures also read like the lower numbers noted above. 90-95 cold/ 35 warm for idle. 85 cruising warm.
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