bjamick

iTrader: (31)

ya mine gets below 40 but it seems like my torque converter has something to do with that. Bc i can be rolling with the car in D and it will be like im rolling in neutral.. IF im going like 15mph or something slower like that.

SS4Luck

iTrader: (10)

once warm i get aroun 38-40 PSI at idle... in 90 degree weather....

i use 10w-30 royal purple

staringback05

iTrader: (8)

nope pedro....an LT1 will idle with a lower psi but just slightly...and if your idleing in a ls1 with 20-25 constant...youve got a problem....

these cars do not function on that redneck bullshit idea of 10psi per 1000 rpms....whoever keeps spreading that on here should be taken out and shot....because im sure theyve ruined alot of guys motors with that talk...

for example in theory......a A4 car idles around 500rpms (mine does)...soo my engine would function at 5psi with no problems?!?!...WTF


what ive learned from experience and two gm techs....at 1000rpms your car should be have a psi around 30....AT LEAST


ive had 3 ls1 motors....my first with 46k miles on it idle'd at 28 psi...and spun 2 bearings in the process due to lack of lubrication....

2000badbird

iTrader: (5)

+1 he is rite for an small block 10 psi for every 1000rpm is ok not on a ls1 if you dont have at least 30 at idle you should get that looked at

RPM WS6

iTrader: (3)

LOL.... we will always be debating this.

28psi at idle isn't going to kill an LS1. Perhaps you were making lower than needed oil pressure at higher rpms. I see 25-30psi in summer weather under certain circumstances at idle (very hot outside temps, or A/C on, or extended idling period, or heavy traffic, or any combo of the former), other times I see 35ish.

But no matter what, oil pressure flies well past 40 as soon as I start to give it a bit of gas. I'm well past 50psi by the time I hit 3,000 rpm, and it just keeps going up from there.

No harm done. No worries here.

staringback05

iTrader: (8)

^^^ understandable....but i think you'd also agree that 20-25 is unhealthy

styoung

iTrader: (4)

my oil pressure is 40 psi at idle warm and climbs with rpms, when its cold i see 50 psi at idle.

staringback05

iTrader: (8)

^^^thats a good oil psi...

styoung

iTrader: (4)

i thought it was about right, i use the recommened 10w30 oil

staringback05

iTrader: (8)

hmm thats kinda a thin oil....i guess it doesnt get as hot up there as down here....and if your getting that good of pressure...ooo well

imflyn

iTrader: (2)

Within the last week or two I've noticed my oil pressure decreasing as well. The temperature has warmed up from around freezing to 70's so I think that's part of why I'm just now noticing it. Cold idle I get about 40, but after it warms up the warm o/p is 22-25 psi. I have an A4 so in gear it idles around 600 rpm. When it's cold the oil pressure goes up to about 60 psi at 4k and warm the o/p at 4k is about 40 - 45 psi . I know this is lower than I saw last summer so I'm going to start with the sensor. I know it's behind the intake. Any helpful hints on how to change it? I was also planning on using autorx as soon as it arrives.

BTW I changed the oil less than a 1k miles ago w/ mobil 10/30 and mobil filter, and yes it's still full. I also notice something odd. When I'm on the highway and the t/c is locked up, if I give it a little gas the pressure goes down a couple psi and when I let off the throttle it comes back up a couple psi. Kind of weird. Maybe this provides some additions clues?

Oh yeah, 98 t/a with 118k miles.

styoung

iTrader: (4)

i use what the owners maual told me to for my temp range, 0F to 80F i think.

RPM WS6

iTrader: (3)

That is not good. Pressure drop as throttle is applied can = worn bearings.

But first, I'd check the sending unit for accuracy.

RPM WS6

iTrader: (3)

Yes, if you're always seeing 20-25psi on the factory gage just as soon as the motor hits operating temps, regardless of weather, idle/run time, or load at idle; then you likely have some kind of issue. Might be the internals wearing down (bearings, etc.), or a pump having issues, or a sending unit going bad.

My only point on this (as always when we have this debate ) is that, under some circumstances, it's not necessarily a warning sign just because pressure drops to 25ish at idle for a limited time during certain harsh conditions. I'm specifically speaking on the A4 cars, with a 550rpm idle speed in gear. M6 being at 800 will always give you a tad more pressure.

imflyn

iTrader: (2)

DOH! That's not what I wanted to hear. I'm going to call around tomorrow and try to find a place to put a mechanical gauge on there and check it out.

RPM WS6

iTrader: (3)

It's never a good thing when you see a pressure drop as throttle is applied.

HOWEVER, I wouldn't get too concerned until you've ruled out a bad sending unit.

Boodyrider

iTrader: (2)

Link to article, no BS about "my friend knew this guy who heard". Otherwise, STFU.

And your 'buddy' had a hell of a lot more wrong if "metal shavings" got anywhere.

RPM WS6

iTrader: (3)

I agree.

I've read that K&N is one of the best. Also top ranked are the M1 filters, and the old AC Delco Ultraguard Gold (discontinued).

staringback05

iTrader: (8)

ehhh just dont get a fram filter....

imflyn

iTrader: (2)

Well I had the pressure checked with a mechanical gauge today and hot idle is actually only 18 psi...sigh. So I just got off the phone in regards to some rebuilt options and I'm excited about that, but not the money. Just thought I'd give you all and update and thanks for the help RPM.