Rb25det Dipstick

[sly32]

hey,

just got my rb25 going, it was a stagea motor and ive put a 2wd sump on,

so i noticed that the rb25 dip stick is shorter than rb20? is this because of the sump for the awd system is smaller, so thats why you have a shorter stick to make up the the loss of oil?

reason i ask is because when i first start my car oil pressure goes up to 5-6kg/2 (hope thats the right measure) but when its fully warm and idling at 750-800 rpm it sits on 2kg, it may only be going up to 6 because its a pretty thick oil and the fact that its going through a oil cooler and relocate kit?

oil im using is penrite Sinthetic 5, 5-50w or 60w can remeber what its called, on the website they reccomend using a semi sinthetic HPR10 or HPR5?

should i not worry about the size of dipstick and leave oil at the hieght according to the stick?

Cheers

[and3_3]

Well how much oil is in the motor? Its about 4 liters that goes into an RB25

[blind_elk]

Oil level in the sump and oil pessure are totally unrelated (until you don't have enough oil in the sump to pump it around!) The oil pressure is a function of the oil itself.

A 50 or 60 grade oil is too "heavy" for a RB25, you should be using a 30 or 40, ie 0-30 / 5-30 / 5-40 / 10-40.

[bubba]

If you are low on oil then it will heat up quicker/get thinner quicker/pressure gets lower faster.

On topic: yes I imagine the difference in dipstick lengths is due to the awd sump.

[SiR_RB]

duno about the 4wd sump, but eevrytime i change my oil, i put in the whole 5 litres and the oil mark is dead on the line. plus the oil filter is usualy an extra 500 or so ML

on a side note, mine when warm idling oil pressure is on 3 - 3.5kg

[bubba]

+1 for the 5L, that's how much my RB30 with stock sump, no cooler or relocation takes.

[sly32]

tru well i was just checking, i think ive put it 4.5L so yeah, i think it should be fine, the only reason about oil pressure and amount you put in, is the fact that i used to work at subaru and i remember an guy doing a home service on his wrx, he over filled the oil a shitload and it lost comp in one piston because of it,

so i think it would be fine,

as for oil, use a 5-40 oil? royal purple or something,

Cheers JV

[TAKUSHI]

my rb25 takes 4.5L of oil, that takes it to the full line, would at least start with that much,

as for oil im using a valvoline 5w-30 dura blend, maybe gone through 6-7 oil changes using

it and never had a prob

[tridentt150v]

  SiR_RB said:

duno about the 4wd sump, but eevrytime i change my oil, i put in the whole 5 litres and the oil mark is dead on the line. plus the oil filter is usualy an extra 500 or so ML

on a side note, mine when warm idling oil pressure is on 3 - 3.5kg

Thats too much pressure, you sure you got it right? 2 is OK at idle, 3.5 to 4 at cruise and 4+ above say 3000rpm.

[bubba]

Are you guys reading these values off the stock gauge? get a real oil pressure gauge and then came back talking in psi

Edited February 6, 2009 by bubba

[tridentt150v]

  bubba said:

Are you guys reading these values off the stock gauge? get a real oil pressure gauge and then came back talking in psi

GReddy

[bubba]

Furry muff, now you're going to make me find the conversion

[PM-R33]

kg/cm2 to psi is multiply by 14.21

So 2 on idle is 28.4psi

[bubba]

Thankyou

With my N1 pump, no restrictors and 10W50 oil I see (when warm) 10-20psi at idle depending on oil temp and an extra 20psi for every 1000rpm (so 30-40psi @ 2000rpm, 50-60psi @ 3000rpm, 70-80psi @ 4000rpm and anything over that is pretty much 100psi).

[tridentt150v]

See Bubba it wasn't hard to drag you into the 21st Century.......was it!!! Only been metric since 1975!!! lol

So you have 1 to 1.5 at idle, 2 to 3 at 2000rpm, 3.5 to 4.2 at 3000rpm and then ever onwards and upwards, thats pretty much what I have [and said]. So we either have two engines about to let go, or its normal.........I vote normal.

[bubba]

Pffft, the past is comfy

And no my engine isn't about to kablamo, it's pretty fresh and some say I have a bit too much oil pressure

[Waza_GTR]

I was getting the same with N1 pump. Put in external pressure regulator to get it down a bit.

100 is too much for turbo seals.