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Old 07-25-2003, 02:45 PM   #1
8Complex

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Default Garrett turbo oil pressure problems...

Well, I've been fairly sure that my turbo has been getting too much pressure for a while (been passing oil past the seals for ages now, even after a rebuild). I've only found one page online that details putting in an oil restrictor to cut the pressure, but I called Turbonetics and they said that they make nothing to remedy this situation and it will "just leak" if you do nothing to fix it. Heh, pretty assinine, huh?

So does anyone have any advice regarding cutting the oil pressure before it leads into the turbo without the flow going too low? I can't even find restrictors anywhere, even if I wanted one! For reference, I've got a -4AN feed line and a -8AN return line.
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Old 07-25-2003, 02:57 PM   #2
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switch to a banjo fitting, thet combined with a 3an line and you should be able to cut the pressure down a good bit.

i;ll talk to ya about it this weekend
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Old 07-25-2003, 06:48 PM   #3
ataac_flat04
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Make yourself a "sandwich" to go between the oil inlet on the turbo and your "-4 adaptor" with a hole in it similar in size to that of the banjo bolt that goes into the oil inlet on the stock turbo. Stacked in order you would have: turbo, gasket, new "sandwich" with restricter hole, gasket, original -4 adapter, two bolts. I'd make the new restrictor plate about 0.25" thick. Prolly take about 20 minutes to make. Just a thought. -Chuck

Edit: I was thinking I made the restrictor hole in mine about 1/8" dia. Best to measure if you have an old stock banjo bolt laying around tho.
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Old 07-25-2003, 08:02 PM   #4
8Complex

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I actually found another way this afternoon, but now I just need a working drill to get it done (damned dead battery charger!).

I basically took a 1/8"NPT x -4AN male/male fitting and drilled and tapped the -4AN end to 1/4-20, then screwed a 1/4-20 set screw into it. I just need to drill a hole through the set screw and I'm done. I had seen one page online where someone used an .060" restrictor, but that seems awfully small to me, being 1/3 of the -4AN normal inside diameter, so I think I will drill it to about .090" and see how that works. Maybe I'll go 1/8" and try that out and if it still smokes, I can just insert another set screw and drill it .090".

I think the set screws cost me $1.09 for 4 of them, so it's not like it's a huge expense, either.
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Old 07-25-2003, 08:36 PM   #5
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Can you take a picture of that and post it? I'm trying to visualize it and I dont think I'm seeing it right in my head.
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Old 07-25-2003, 09:28 PM   #6
8Complex

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The standard inner diameter of that fitting is .175" for reference.



The top brass fitting is a 1/8"NPT street elbow (M/F) that I will use to angle the straight fitting correctly.

On the lower left is the blue fitting that I talked about above. You can see the set screw screwed into the fitting and a bit of the surrounding anodizing filed off (just to make sure there were no burrs, I cleaned it up). On the lower right are 3 of the same set screws to the one in the fitting.

The reason I went with the set screw over a washer or something like that is because I didn't want to deal with making 100% sure it was sandwiched properly, or possibly suffer it breaking up and entering the turbo (bad). Also, I put it on the feed side of the fitting versus the end towards the turbo because the pressure will always be pushing it more into it's thread (which is only threaded in as far as the screw is deep).

Now I just need to drill a hole through it and I'll be good to go. The set screws are probably hardened just enough to make it tough, though. *shrug*

In retrospect, I probably could've used a #10 set screw instead of the 1/4-20, but I wasn't sure that I had a tap for that size, so I ended up drilling out the fitting slightly to get the tap to work correctly.

Also, as it sits, I can drill it out probably 1/8" and still use a hex key to change out that set screw since the drill fit inside the socket without messing up the edges.
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Old 07-26-2003, 12:24 AM   #7
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Time buy a drill press Nick!

heh,Its saved my ass several times,That and a welder,and a plasma cutter,Air compressors,two of the big ones.......
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Old 07-26-2003, 05:47 AM   #8
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Yeah, but I'm almost out of workbench space as it is! Hell, I'm using my sister's old dresser as a secondary workbench in the garage. Maybe I'll take a trip to the Harbor Freight store tomaro and take a look at what they've got (if they're open)... maybe I can find something small and cheap.
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Old 07-26-2003, 01:20 PM   #9
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Old 07-26-2003, 05:17 PM   #10
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8
where are you getting the feed from?

here's what i did on mine

TEE off the sending unit on top of the block. 90 out of there to a -4 line to another 90 on the turbo.
then i had a -10 return line going as straight to the oil pan with only a 45 at the bung on the pan. bigger is better on the return

never smoked! and as far as i can tell its not smoking on Kian now either
tom
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Old 07-26-2003, 05:26 PM   #11
8Complex

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Drac9 - Looks good, but I think I've reconsidered and am going to get a Craftsman... not too much more, and I can put it on the credit card, so it'll be quite a bit less stress on the pocketbook. Not a bad piece, though I'll still get accessories from Harbor Freight.

Tom - I've got a seperate fitting on the back galley (like the pressure one, but next to the crankcase vent) going to a 45 -4 fitting, to a -4 line, to a 90 -4 fitting into the turbo. Then a -8 coming out a 45 fitting below the turbo, around the mount and through a 120 fitting into the pan. There are no flat sections, it goes downhill the entire way. I found that -10 was hard to fit under there after working on another friend's car, hence the reason I went with -8. Also, I don't remember what your base kit was, but this one is a Ludespeed, so it sits the turbo pretty high... the Minnam I've worked with sat the turbo real low, making that return line a real PITA.
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Old 07-26-2003, 05:35 PM   #12
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hmmm
the first crap kit was a ASR that i had to redo 99.99999% of
the second one was a Vishnu monster( that kit SCARED ME) Big powah!!!

i used the same lines for each kit

the 120 might be making it go around too much

can you take a picture underneath the car for me?
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Old 07-26-2003, 05:43 PM   #13
8Complex

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I can throw it up on ramps and get a pic, but basically the bung is welded in the same place as Andrew Yeun's that you did for him, then it comes out horizontally to the 120 fitting which is angled upwards and back, which then the line snakes between the mount and the motor, upwards about 30-45 to the turbo inlet.

Were those turbos you were using ball bearing or standard bushing? I'm wondering if they have a different tolerance for oil pressure handling as I ran about the same setup with the Minnam kit except a -10 return line, and it doesn't smoke at all.

I'm guessing more then likely it's my turbo seals, but I'm trying everything else before I pull it back out and reseal the intake side with the old seals. Before I rebuilt it, it was the exhaust side that was leaking, now it's the intake. Doh!
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Old 07-29-2003, 12:25 PM   #14
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hey tard, did you get it fixed?
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Old 07-29-2003, 03:28 PM   #15
8Complex

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My drill is still dead. :-/

I'll find somewhere to drill it out this evening... I'm still kinda hoping I can get the feed fitting out that is in there now without taking off the other housings (doh).
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