project 1mz celica, 94 gt starting a new life Options

[Smaay]

that sounds normal to me

[kurt95gt]

Is it an im freaking over nothing?
Ive never seen my psi drop on my 5s like that but it also doesnt go as high eather my 5s doesnt break 70psi eather

Ill get the brakes bled an the thremstat changed an see what happens

[Special_Edy]

There is a pressure release valve, not sure what pressure its set to on toyotas though. It opens at a certain pressure and lets oil flow back into the sump.


The old saying is that you need at least 10psi of oil pressure for every 1000 rpms. Lol my old Chevy only turns 3psi @500 rpm once its gotten hot, even though it pushes 40psi @500rpm when its cold. Its been running like that for years thats just the way it is.

I think your just worrying too much. Of course its a great thing your paying this close of attention to your engine. So ultimately you get a cookie for keeping a close eye.

This post has been edited by Special_Edy: May 15, 2012 - 2:42 PM

[kurt95gt]

I hope you guys are right

[Special_Edy]

I hope you guys are right

Two very general statements-

As long as your below 200° F on the coolant temp your ok. 210°- 220° you need to stop your car and pour something cold over the radiator. I dont think damage will occur till probably in excess of 250°. So 190° isnt a big deal, so long as it stays consistant.

10psi of oil pressure per 1000rpms, so 65psi @ 6500rpm for example. Surely not the factory spec for your engine but so long as you stay above this threshold your getting plenty of oil. If you were to fall below this point you need to quit driving and do so investigating.

[kurt95gt]

Well only pne way to find oit for sure lol
Still going to change the t stat but i really want to see how the oil pressure acts at warm up

[stephen_lee]

yeah the pressure relief valve will open at a certain psi and close at a lower psi to try to keep a max pressure even

say it opens at 85psi.. and closes at 70... then your situation will be normal

similar thing for cooling fans.. turn on at 230* and off at 210*... its to keep it from rapidly switching from active to not...

[kurt95gt]

Well ill work on her some tonight an get a fee things figured out an report back

[Smaay]

updates?

[kurt95gt]

Wife got sick at work last night so therr was no working on the car
but shes feeling better today
Im finishing up a couple small things under the car them im going to start her up an watch my gauges

[stephen_lee]

I'm betting thats within normal specs. new oil will always have a high pressure and will drop as the oil ages and breaks down.

what was your max psi before?

also the pressure relief valve may have been sludged up from sitting and finally broke loose.

Do you have the BGB on this engine? in there lists the oil pressure specs

[kurt95gt]

Well let her set an warm up for about 2 minutes
The oil psi dropped to 40
Id start to rev it an ithe psi would get 45 then drop to 30-35
In the same rpm range as before an im getting pressure build up on one side of the coolent system
The upper hose starts to leak as the car warms up

[stephen_lee]

interesting.. low pressure could be caused by a leak or a bad pump... or super thin oil..

[stephen_lee]

Low oil pressure troubleshooting

[kurt95gt]

Thag gives me a few ideas on what to check
Reading that makes me think its a sludge issue( go figure)
since the psi starts out fine an then drops at higher rpms
Im going to get that t stat pulled out tonight or in the am an runs some seafoam through at idle
An do a cheap oil change
Maybe drop the oil pan an make sure the pick up is clean too

[stephen_lee]

i agree on the pickup.. clean it really really well with brakeparts cleaner, swish it around in water or something then again with brake cleaner

hopefully that gets u back up

[kurt95gt]

Yay weekend project!!!

[kurt95gt]

Small update
Got her up on jackstands all the way around
Took off the hoid an all 4 wheels
Bled the brakes an adjusted the clutch pedal an rebled it too
next we be dropping the oil pan an see how bad it looks an clean the pan an pick up

An pull the valve covers off an see if i can clean any sludge out of there too

[kurt95gt]

Another micro update
Pulld the old t stat out cleaned the t stat housing an installed the new t stat
Gonna fill of the system tomorrow an ser what happens

[Box]

*crosses fingers*