Just installed an Oil Press gauge, its electrical, at idle my b18a says 40psi roughly and at WOT its like 95 to 100psi, that alot of pressure for a stock LS oil pump, why is it so high?

thanks

wade

this might be why my turbos smoke alot through the seals?

 

That's normal pressure at idle when cold. Everything else is normal too (except for the turbo smoking )

 

that sounds high even for a vtec motor , i was thinking they were around 80psi

 

when i first start car im at like 50 - 60 psi .... it gradually sets down

after a good 30 min of driving im at like 15 - 20 psi at idle.. 65-70 when punching it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J337_UNIT &raquo;</TD></TR><TR><TD CLASS="quote">when i first start car im at like 50 - 60 psi .... it gradually sets down

after a good 30 min of driving im at like 15 - 20 psi at idle.. 65-70 when punching it</TD></TR></TABLE>

those numbers are correct

me 6 bar cold, 1.1 bar idle (once warm) around 4 bar when driving at 60 mph

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J337_UNIT &raquo;</TD></TR><TR><TD CLASS="quote">when i first start car im at like 50 - 60 psi .... it gradually sets down

after a good 30 min of driving im at like 15 - 20 psi at idle.. 65-70 when punching it</TD></TR></TABLE>

ditto

 

not meaning to hijack the thread but do people just let the turbos take this oil pressure..meaning can turbos handle this oil pressure? or restrictors need to be installed...

 

rectrictors should be installed , are they always used , no.

 

I have that much pressure... I f'd up my first turbo with the pressure and a -4 feed line and -8 return...

I'm now on a -3 feed, -10 return, and a restrictor with a pretty small hole in it... No smoke, no noises yet... I think I'm aok.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiR Kid &raquo;</TD></TR><TR><TD CLASS="quote">I'm now on a -3 feed, -10 return, and a restrictor with a pretty small hole in it... No smoke, no noises yet... I think I'm aok. </TD></TR></TABLE>

LOL, I've pieced together some stuff with precise measurements like that in the past. Some of it ran pretty good, too

I've been cutting up old MIG welder tips, brazing them inside oil line adapters right before the turbo, then opening up the 0.023-0.035" orifice tips come in with a #57 drill bit to get desired orifice size. On something other than an LS and T3 combo, the orifice might need to change to get desired oil pressures.

That oil pressure gauge everyone tells you that you need? Do youself a favor and hook it to your turbo before you put more than a couple miles on the setup. I've got a Holset HX30 on my floor right now that has it's compressor full of oil because (I am ASSuming) it was run on a Honda with the stock oil feed line w/built in restrictor... I haven't measured the orifice yet, but if it's like the HX35, it's 0.080" or bigger.

 

J. Davis.... What size do u drill out your adapter/restrictors to be? mine is 1/16 inch and still a hair to large, i just have a freak oil pump.


Where do u find such small drill bits? The smallest i can ever find are 1/16 drill bits.

 

i guess i need to make a restrictor!

when i start the car cold, i have 100 psi....drops to about 15 when hot at idle...still goes back to 80-90+ when i kick it!

h22 oil pump w/prodrive gear...but my stock pump made similar #'s

 

i feel that FastLude, we both have crazy *** oil pressure, my turbos hate it

 

i don't know how much it would change anything, but you could try a bigger oil filter. I've heard that can help lower oil psi.

 

how much oil pressure is too much for a turbo/?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wade &raquo;</TD></TR><TR><TD CLASS="quote">J. Davis.... What size do u drill out your adapter/restrictors to be? mine is 1/16 inch and still a hair to large, i just have a freak oil pump.


Where do u find such small drill bits? The smallest i can ever find are 1/16 drill bits.</TD></TR></TABLE>

I'm not sure if you were the guy on AIM or not, but even if you were I think everybody could benefit from the $0.02. Sorry for an incomplete tech post.

1/16" drill gets you arounf .065-.068" and is too big as a proper restrictor *in some cases*. The best way to check is an oil pressure gauge! Hook it up for an hour, save a few hundred dollars worth of turbo. The #57 puts you at .043" and a #55 at, ah, .051-.054", I can't exactly remember. A netsearch should be revealing. You can source them through any bolts and nut aka fastener house, or machinist supply. Locally, we have Nuts and Bolts, Bolt and Screw, B&K Tool, Grainger (yes, I have a local Grainger, used to live a 1/4 mile from it), and probably a lot of places I've not bothered checking. A yellowpages search should be revealing

Most T3 want 15 psi at idle and I forget how much under normal engine operation... I have 35 psi, it works fine. You can call a turbo shop and ask, or check for online manufacturer specs.

 

i shimmed my oil pump h22,i want to say 60 ths .i have 50 lbs of oil pressure at idle.you sure can tell a difference in the motor to well at least i could.

 

i havew about 50 psi cold and when warm comes down to about 18-20 psi. but at WOT my max oil psi is about 50-55 psi. i have never gone above 55 psi. thats the way i like it.

allmy oil lines are 3an except for return which is 10an no need for restrictors.