WHITE DEATH

So what is up with this Fu@k!ng oil restrictor BS! I just read for about an hour through old threads and websites about this damn thing and I have ten different answers. I just bought a brand new GT28RS and I really dont want to ruin the motherfu@ker and waste a $1000. I read on Garrett's website anything over 60 psi oil pressure requires a restrictor. So WTF!! Which one? Some people say you dont need it, some say you do? If so which one? Somebody with EXPERIENCE with GT series let me know what you have on your setup. Thanks.

Arturbo

use a restrictor.

WHITE DEATH

Which one do you prefer? The ATPturbo style?

Arturbo

They all do the same same thing. ATP has worked for me.

WHITE DEATH

If thats what you use then thats good enough for me. But where do you install it? In the end of the oil line at the turbo or off the brass fitting on the back of the block?

sohc_turd

Even though i have mine at my fire-wall "t" (my turbo bearly spins off idle anyway) Id probably recommend putting the restrictor closest to your turbo.

HiProfile

The common answer seems to be just a -3an oil feed line (small enough to not need a restrictor) <U>for journal bearing turbos</U>, but a restrictor with a 0.060" hole in it works well enough for ball bearing turbos.

I'm planning on using the .060" hole with a -4an line since I'm stuck with a junkyard turbo until I work out the specifics...and save up a bit more cash.

WHITE DEATH

Sounds good.

Dunc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">The common answer seems to be just a -3an oil feed line (small enough to not need a restrictor) <U>for journal bearing turbos</U>, but a restrictor with a 0.060" hole in it works well enough for ball bearing turbos.

I'm planning on using the .060" hole with a -4an line since I'm stuck with a junkyard turbo until I work out the specifics...and save up a bit more cash.</TD></TR></TABLE>

And what if you're seeing 80psi of oil with -3AN lines?

Drew Peacock

They have one built in. All GT turbo's do.

Dunc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbozxi &raquo;</TD></TR><TR><TD CLASS="quote">They have one built in. All GT turbo's do.</TD></TR></TABLE>

I was refering to a journal bearing turbo. Specifically the Garrett T3 60-1 .82. 80psi just seems incredibly high to me. My current turbo started leaking, but I don't know if it was just old or if it was the oil pressure that did it. Sooo obviously I don't want to screw up a brand new one.

VTteg

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AF-P Dunc &raquo;</TD></TR><TR><TD CLASS="quote">And what if you're seeing 80psi of oil with -3AN lines?</TD></TR></TABLE>

The -3 hose cuts down on the volume of oil flowing in at 80 psi. If you have a garden hose for a feed line flowing at 80 psi, your going to have a lot of volume of oil. Shrink that hose down to a -3AN, and you cut down on the volume.

And aparently, the reduced volume is still enough to keep the bearings lubricated enough.

Unfortunatly, this seems to be a trial and error process to try and find the correctly sized oil lines. Take advantage of other peoples failures and successes and use a -3 line, or a -4 line with a restrictor.

Dunc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTteg &raquo;</TD></TR><TR><TD CLASS="quote">

The -3 hose cuts down on the volume of oil flowing in at 80 psi. If you have a garden hose for a feed line flowing at 80 psi, your going to have a lot of volume of oil. Shrink that hose down to a -3AN, and you cut down on the volume.

And aparently, the reduced volume is still enough to keep the bearings lubricated enough.

Unfortunatly, this seems to be a trial and error process to try and find the correctly sized oil lines. Take advantage of other peoples failures and successes and use a -3 line, or a -4 line with a restrictor. </TD></TR></TABLE>

Yea that's the only thing though, the current turbo began leaking with a -3AN @ 80psi so I'd guess I'd be leaning toward using one. I called a Garrett dealer and he told me to not use one and to look for signs of leaking. Now hold up there dude, why would I do that because by then my seals are f-ed up What suppliers need to do is tell people what the minimum required and/or the maximum required amount of oil is needed in terms of psi and stick to one common -AN size hose. That would solve all of these stupid oil restrictor threads and debates.

troubledsol03

I ran a 4AN line NO restrictor to my 60-1 for about 2 years never saw a single drop of oil out of it when I took it off and inspected it everything was perfect

Maybe I was just lucky?

Muckman

iTrader: (2)

If all GT turbos have restrictors built in then why are we having this dicussion? Why would anyone use an additional restrictor?

desiromeo812

yup tru... alll gt and greddy turbo's have restrictors built in,.,,, jus make sure ur oil return can flow everything out ,, u shouldnt have problems bro..

JDMs1eeper

Garrett ball bearing turbochargers require less oil than journal bearing turbos. Therefore an oil inlet restrictor is recommended if you have oil pressure over about 60 psig. The oil outlet should be plumbed to the oil pan above the oil level (for wet sump systems). Since the oil drain is gravity fed, it is important that the oil outlet points downward, and that the drain tube does not become horizontal or go “uphill” at any point.

Reduced Oil Flow – The ball bearing design reduces the required amount of oil required to provide adequate lubrication. This lower oil volume reduces the chance for seal leakage. Also, the ball bearing is more tolerant of marginal lube conditions, and diminishes the possibility of turbocharger failure on engine shut down.

-turbobygarrett.com

Drew Peacock

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">If all GT turbos have restrictors built in then why are we having this dicussion? Why would anyone use an additional restrictor?</TD></TR></TABLE>

http://forums.freshalloy.com/u...37624

They reccomend the use of an additional restrictor most factory turbo cars use one in the stock oil lines...

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AF-P Dunc &raquo;</TD></TR><TR><TD CLASS="quote">Yea that's the only thing though, the current turbo began leaking with a -3AN @ 80psi so I'd guess I'd be leaning toward using one. I called a Garrett dealer and he told me to not use one and to look for signs of leaking. Now hold up there dude, why would I do that because by then my seals are f-ed up What suppliers need to do is tell people what the minimum required and/or the maximum required amount of oil is needed in terms of psi and stick to one common -AN size hose. That would solve all of these stupid oil restrictor threads and debates.</TD></TR></TABLE>

Agree completely with you. I don't want to deal with this down the road either. I am going to get one but maybe open the hole up. Who knows, this **** sucks..

Damned if you do, damned if you don't!

stealthmode62

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbozxi &raquo;</TD></TR><TR><TD CLASS="quote"> most factory turbo cars use one in the stock oil lines... </TD></TR></TABLE>


Which cars would that be? I've never seen that before.

Drew Peacock

Nissans are what I am familiar with, Subarus and there IHI turbo have a restrictor as the bolt which holds the oil line in.

stealthmode62

The banjo bolt is considered a restrictor?

Drew Peacock

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stealthmode62 &raquo;</TD></TR><TR><TD CLASS="quote"> The banjo bolt is considered a restrictor? </TD></TR></TABLE> Yeah why not, if you ever get the chance check out the difference between a BB and plain bearing ihi turbo.

stealthmode62

I guess, if that's the way you look at it. My honda came with a fuel restrictor on it too.

Drew Peacock

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stealthmode62 &raquo;</TD></TR><TR><TD CLASS="quote"> I guess, if that's the way you look at it. My honda came with a fuel restrictor on it too. </TD></TR></TABLE>Haha I'm not going to spell it out for you, think what ya will.