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oil pressure question?

 
Old 08-31-2007, 11:20 PM
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ok first off i know it might just be my oil pressure gauge in the car may be reading wrong. ok i have noticed that my oil pressure gauge reads almost at 0 when at idle when the car gets hot. then at about 4k rpm in 5th it only reads at 30. so does this meen my oil pump might need to be replaced? also at idle my exhaust blows smoke which is oil. but if i push the pedal up to about 1500 rpm the oil pressure gauge jumps to what i believe would be 15 and the oil smoke stops coming out the exhaust. i have 10w30 castrol syntec blend in it now. i plan on putting in some 20w50 in the morning and seeing if it makes a difference. but does it sound like what any of your cars have done? is that what the gauge should read? i have a 91 greddy turbo. im still hitting 5lbs boost. if the gauge should read that and its not my oil pump then i guess its my turbo so if so what is the least for cost but decent work turbo rebuild shop?
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Old 08-31-2007, 11:31 PM
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air bubbles? mine has this problem when i need an oil change... i have a headgasket leak (small) hopefully after i fix it i wont have to worry anymore. I seem to have less and less oil change intervals now.
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Old 09-01-2007, 01:01 AM
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Disconnect the pipe from the turbo compressor outlet and feel around inside it with your finger. If it's oily then you need to start thinking about a turbo rebuild. It's possible that oil could be seeping out the turbine side only, but less likely and almost impossible to determine in situ. It could also very well be rings, or perhaps (though less likely) even valve guides.

As to the oil pressure, if the gauge is in fact giving you an accurate reading then it's way too low. With the engine cold, you should see 30PSI at idle, 60-90 PSI at 3k. When the oil is hot, I'd expect 10-20PSI idle, 45-60 PSI at 3k.

If you don't have a mechanical oil pressure gauge handy, I'd suggest paying a visit to a local mechanic and having them put one on to verify what the pressure really is. Just make sure they know that the hole is 1/8" BSP, not 1/8" NPT.
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Old 09-01-2007, 01:14 AM
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so joe were would you suggest for me to go to? i live in elcajon? also im pretty certain its time for another rebuild. the reason is i know there is oil in my pipes. but the oil pressure thing concerns me because it has read that same way ever since i hooked up the turbo.
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Old 09-01-2007, 02:03 AM
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try changing your oil to mobil 1 10w30, syntec is junk. also clean the contacts on your OPG sensor. try these 2 things and report back.
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Old 09-01-2007, 02:04 AM
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another thing, is your feed line coming off the block on the driver's side or a T on the OPG sensor fitting?
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Old 09-01-2007, 03:25 AM
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Use a Mazda Millenia filter. It fits, is larger, flows better. My op was [email protected] and 20 after using that filter and now 25 after switching to 2050 synthetic.
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Old 09-01-2007, 06:44 AM
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feed line is coming off the block. i will try the filter and 20 50 royal purple tommorrow i will report back. then on monday i decide new turbo or better front mount. i believe i fucked up my turbo due to my piping kept popping off during drifting and i wouldnt get off it when it did and i think i might have over spun the turbo so im thinking new turbo but i think the pressure should be higher.
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Old 09-01-2007, 08:26 AM
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don't think Royal Purple is in order
try something cheap but good like Rotella (I love that ****, $14 for a 4qt jug of Synthetic at WalMart; been using it a lot lately) or if you're ballin go with the mobile1 which is slightly more expensive.
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Old 09-01-2007, 12:31 PM
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so your saying switch to full synthetic?
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Old 09-01-2007, 12:43 PM
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royal purple or bust everything else does not keep up on my car. From my experience anyway.
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Old 09-01-2007, 02:59 PM
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RP is garbage.
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Old 09-01-2007, 03:55 PM
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Originally Posted by lazzer408 View Post
RP is garbage.
Xplaine
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Old 09-01-2007, 04:58 PM
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Contains moly.
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Old 09-01-2007, 06:31 PM
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So far Royal Purple is the only oil that doesn't thin out alot on my car. I have tried Amsoil, Mobil 1, Q, Castrol and a few others, they all thinned and left me with less than 15psi at warm idle. With Royal Purple it stays around 20-25psi. The car by the way has 61k on it and does not leak or burn any oil.
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Old 09-01-2007, 06:42 PM
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Personally I just use any 20w50 synthetic I can find. With RP I can't see if the oil is dirty or not. It looks dark when it comes out of the bottle. Plus I tend to stay away from "cult products". Go read some tests. RP isn't that great. Mobil-1 scores better, hell even Castrol scores better in some tests. If you want 'good' oil use diesel truck oil. Anything else has been 'tainted' by the EPA.
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Old 09-01-2007, 08:17 PM
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Originally Posted by miataspeed1point6 View Post
So far Royal Purple is the only oil that doesn't thin out alot on my car. I have tried Amsoil, Mobil 1, Q, Castrol and a few others, they all thinned and left me with less than 15psi at warm idle. With Royal Purple it stays around 20-25psi. The car by the way has 61k on it and does not leak or burn any oil.
I get the same results as you and generall better hp and mileage per oil change RP is the only **** that has ever lasted more than 500 miles in my car since the turbo went on. Before the turbo mobil 1 or Q would go for 2-3 K depending on how hard i beat the car. I am picky about my oil. Lazzer so what if it has molly that is a good thin we dont run wet clutches so why would the molly hurt us? Less friction and all together better heat cycle life.
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Old 09-01-2007, 11:33 PM
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I'd been contemplating the switch as well- currently I use M1 0W40. Which weight of RP are you other turbo folks running?
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Old 09-02-2007, 02:58 AM
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Originally Posted by magnamx-5 View Post
so why would the molly hurt us?
It's hard on the valve train. Valve guides mostly.
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Old 09-02-2007, 03:09 AM
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um well i did rp today with the milenia filter and well the oil pressure is back were it should be but turbo is still blowing smoke so time for a new turbo.
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