pdd

iTrader: (3)

my cars between 25 and 40

Patman

Sounds fine to me. My LT1, which is in excellent mechanical health, runs between 20psi (at idle) to about 45psi at full throttle. (this is with hot oil, it's higher when cold obviously)

soundengineer

iTrader: (16)

Rule of thumb is that you NEED 10 PSI for every 1000 rpm....25 seems a little low to me...I always saw around 35-40 at idle with the stock pump...and 60-70 at WOT high rpm...now I have a ported pump and see 45 at idle and 70-80 at WOT high rpm. and it is LS1???LS6??? not an LT1.

pdd

iTrader: (3)

ya its an ls1

Patman

10 psi per 1000rpm is an old rule of thumb, you don't really need that much pressure with modern engines.

FWIW, my LS1 saw pretty similar oil pressure as my LT1 (except since my LS1 was M6, it's pressure at idle was higher, as it is with M6 LT1 cars too)

MontereyLS1

iTrader: (4)

i have a 2000 a4 and it holds about 25-30 at idle when oil is hot....about 50 goin down the road, and 60 or 70 at WOT

SSactionLs1

i have 40 at warm idle...70 at accel...

ported ls6

4thGENRETARD

Same here. 40idl/70 WOT/55 cruising.
What grade oil are u using? I use 5w-50 BP synthetic.(true synthetic)

pdd

iTrader: (3)

i use mobil one 10w-30

Tin Indian

You ask what's "optimum".

Do you think you have a low oil pressure problem?

I guess "optimum" would be in the range of a new un-modified LS1.

About 40 psi at hot idle and 55-60 psi (hot) at highway speed.

Aidan

Mines 20-25 at idle, and 50 driving down the road...

Tin Indian

Aidan ..

20-25 at idle really is very low. Loose just a couple more psi, and you will be looking at the low oil pressure light.

I see you have put lots of parts in the motor. But I have to ask; Your motor did not have that low of idle oil pressure when it was stock, now did it?

Ron,

Tin Indian

BTW, a 10.5 ET @ almost 130 mph on a stock headed motor is unheard of in a non-boosted motor. You don't mention lots of nitrous in your in your sig.

pdd

iTrader: (3)

mine must be low then
i certainly dont wanna rip the whole thing apart again to change the pump.hopefully it won't go any lower

JoSeY

99' LS1 Royal Purple 10-40 105,000 miles

Cold idle...60 psi 3K rpm (warming up) 75psi
Hot idle 45 psi 3k 60psi WOT 70psi

That's what my auto meter gauge and stock gauge reads...so I'm fairly confident it's correct.

Oh did I mention this is on a H/C car with STOCK 99 OIL PUMP.

HS-Y2kFormula

iTrader: (2)

I don't know if I believe that. My brother's 98 Z has always had an hot idle of about 20 psig (according to the stock gauge). He has had the car since it had 9000 miles. After reading on the boards about oil pumps failing, he was sure his was going to crap out. So he bought an ARE ported pump, and we installed it. Well, the cold idle went to about 70 psig, but the hot idle stayed at around 20 psig!

We thought it may have been the infamous o-ring, but why would the cold idle shoot to 70 if it was installed incorrectly. Anyway, after a couple of years, he had heads and cam installed, and the installer verified that the o-ring was fine. After the heads and cam, the oil pressure is still the same.

The car has being driven daily and hard and for about three or four years, and the engine is still running pretty stong with 48K miles. Personally, I think that if an oil pump is going to crap out, it will just do it. I don't know if there is any warning, like losing oil pressure gradually over the days.

Personally, I think my brother wants it to crap out...it will give hime the perfect justification for a TSP 396 stroker!!!!

Country Boy

iTrader: (24)

GM service manual spec is 7 PSI per 1000 RPM for the LSx motor

dlandsvZ28

Before spending any money on a new oil pump, I would measure your oil pressure with an accurate external pressure guage to see what it really is.

Mine (98Z28) is the same as yours. I've never had 60 or 70 as some say.

I suspect yours and mine register faulty readings on the stock guage on the low side and those who have 60 or 70 are registering faulty reading with the stock guage on the high side.

robertbartsch

I thought the old rule of thumb on oil pressure was obsolete since true synthetic oils perform better ...

...the old rule of thumb is not obsolete because less pressure is needed for so-called "modern" motors... ...we don't have modern motors...

...if you want a modern motor, buy a Honda.