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Location:
cambo
Registered:
May 2002
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loss in oil pressure.
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Wed, 01 September 2004 11:01
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lately my oil pressure has been sitting a little lower than usual. as people with sprinters will know there are two marks on the gauge, one half way where it will sit at idle, and another one at about 2/3 where it sits at revs. with the original 4ac its sat on these two marks spot on. with the gze it used to sit a little above the middle mark at idle which i thought was fine, and at the other position at revs (like normal).
since i turbo'd the gze, or maybe around the same time i had it dyno'd, the oil pressure sits at half way at idle (normal) and inbetween the two marks at revs. maybe it happened on the dyno or maybe it was a coincidence im not sure but what should i do? could it be the releif valve sticking? im inclined to think not as it sits in the normal spot at idle. could my pump be stuffed? i hope not!
any suggestions welcome.
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Location:
Brisbane
Registered:
February 2003
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Re: loss in oil pressure.
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Wed, 01 September 2004 11:16
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Mine sits just below half on idle, and moves above it on acceleration, I wouldnt worry unless it drops significantly.
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 11:28
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im jut way parranoid after spending big $$$ on the engine i dont want it to shit itself. i wouldnt be worried if it were always like that but it suddenly changed.
also the gze never used to rev past about 6500rpm cause there was no point but now with the turbo it hits 7-7.5krpm quite quickly, i was hoping that the new revs the engine hasnt seen in years hasnt stuffed something.
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Location:
c'town, NSW
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 11:35
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u using thinner oil?
going from 18R-C to 1G-GE in my RA40 i was using thinner oil and getting readings like you are.
i attributed it to either thinnner oil or possibly different scope on the oil pressure sender on engine.
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 11:41
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i did change the oil but only from cheapo gulf western which i get from work to toyota genuine oil, both 20-50. i was thinking that could be it, but i didnt notice if it was like that when i changed it or the week after when i dyno'd it.
but yeah, same pressure sender.
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: loss in oil pressure.
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Wed, 01 September 2004 11:42
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mine sits at first little line at idle
and goes to 2nd line when you rev
i've got a 4age tho
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 12:46
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could it also be the extra volume the oil pump has to fill feeding the turbo??
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 12:52
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dunno, maybe. but i had the turbo on for a coupla weeks before i had it tuned and i didnt notice a lower pressure during that time, but maybe there was.
i might even try the cheapo gulf western oil again to see if that changes it back. cause would like that little bit of pressure back cause im sure then engines under alot more stress with the turbo, especially with the boost spikes i got atm.
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Location:
Newcastle
Registered:
September 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 12:59
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my mate with his SR had the same sort of thing happen, it had about 15psi at idle then when he change the brand of oil he is using he started to get around 20psi at idle, so we have put it down to different brands of oil even tho they are the same weight.
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 13:00
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youd think a thinner oil would have a lower pressure right?
maybe i should go back to gulf western. only costs me $4 a bottle too hahaha.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: loss in oil pressure.
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Wed, 01 September 2004 13:26
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Sure it's not because you probably tapped the oil source for the turbo off of the same place as the pressure sensor, therefore are bleeding pressure from it?
Also, those gauges are practically meaningless - connect a proper quality test gauge straight to the engine, check out the real oil pressure in PSI/KPA, NOT 'between the two marks' 
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: loss in oil pressure.
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Thu, 02 September 2004 01:11
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| EVOSTi wrote on Wed, 01 September 2004 23:00 |
youd think a thinner oil would have a lower pressure right?
maybe i should go back to gulf western. only costs me $4 a bottle too hahaha.
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Which GW oil are you using thats that cheap?
Also GW has shares in the pioneer oil rig up in the gulf so their cost price on oil is cheaper than most other companies and this is why their oil is a bit cheaper than others in "most" cases.
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Thu, 02 September 2004 11:09
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its cheap cause we buy it in bulk. its actually pretty good oil from what i can tell.
and yeah i have T'd it from the sender. i know the stock gauge isnt especially good but atleast its a guide. its the sudden drop thats got me concerned. i dont think its the gauge otherwise both readings would have dropped but its only the pressure at revs that has dropped.
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: loss in oil pressure.
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Thu, 02 September 2004 15:15
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Did the oil pressure drop after you put in T-peice in? If the pressure dropped after you put the T in then like mrshin said, you'll find that the turbo would most likely be bleeding some of the pressure.
Has the car been using oil? You could even have a leak.
Something from outside the square. There could even be a wire connection fault. Corrosion on a connector leading to a high resistance which means the guage shows a lower reading. But like i said "outside the square"
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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: loss in oil pressure.
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Fri, 03 September 2004 03:36
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i find this can change with a fresh lot of oil. try dropping your current oil and putting exactly the same new stuff in, with a new filter. fill the filter beforehand, and always crank without spark until your oil pressure light goes off
if it stays the same, then that's the pressure that this oil operates at, through different viscosity characteristics in your pump and oil galleries, than the last oil you had. if it changes back to the mark you had before, then i'd say your oil was chopped out and needed a change. do these motors have a filter bypass as well? your filter could have stopped filtering as effectively and not be filtering at its full capacity, effecting the oil pressure reading
just because two oils have the same viscosity rating doesn't mean they lubricate exactly the same
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Location:
cambo
Registered:
May 2002
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Re: loss in oil pressure.
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Sat, 04 September 2004 01:39
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yeah fresh oil and filter. i think most if not all engines have oil bypass for when the get blocked.
either way ill just put it down to the oil for now and just deal with it. i know allt he connections are good and theres no leaks.
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