oil feed line size ???

[4g63awdtalon]

is a -3an to small for an oil line for a garret t3/t turbo?

 

[2bar4g63t]

hi, was wondering the same thing, i have a 57trim t3/t4 and am looking for an oil feed and return line and dont know what sizes to get either, i read somewhere that you are only supposed to use -3an or you will blow the seals on the turbo or somehow damge it, but ive also heard the bigger the better and, apparently the oil comes out of the turbo with a milkshake consistancy, so the bigger the drain line the better, but not for sure, someone on this board knows though.

 

[espinelli]

I found in line filter that utilizes 4AN in and 4AN out. So I think I'm going to go with a 4AN feed lines and a huge return line...maybe a 10AN on the return or something comparable in diameter to the stock oil return tube. I'm not worried about the return as much as the feed line. If anyone else can shed some light on this, that would be great.

 

[DSMJim]

There is a restrictor in the stock oiling system for the turbo that reduces it to roughly the size of a -3 to keep oil pressure from dropping. You don't want too large a feed to the turbo as it pushes too much oil though it. A -3 is the perfect size, you can mate up to and dwon from -3 to -4 for the oil filter if you have to.

You may find the turbo will push oil after a year because of the larger volume of oil its getting pushed through it, maybe not. I have been using -3 for 2 years now on my T3/T4 50trim and have had no problems at all. I went way out of my way to get -3 instead of -4 on somebody elses recommendation as well.

 

[99gst_racer]

OK, from what I've read, on a 1G, use 3AN line from the head to the turbo. And for a 2G use 4AN line from the oil filter to the turbo.....

 

[espinelli]

I think what he is saying is use a 3AN regardless. Personally, I would run a ball bearing turbo from the head since they don't require as much oil the head would be a perfect source for the feed. Otherwise I would use the oil housing.

Jim if you leave the oil housing restrictor in place, can you still use a 4AN line? IE: 1/8 NPT male to a 4AN vs 1/8 NPT to 3AN and not have an adverse affect on oil pressure?

 

[DSMJim]

I think what he is saying is use a 3AN regardless. Personally, I would run a ball bearing turbo from the head since they don't require as much oil the head would be a perfect source for the feed. Otherwise I would use the oil housing.

Jim if you leave the oil housing restrictor in place, can you still use a 4AN line? IE: 1/8 NPT male to a 4AN vs 1/8 NPT to 3AN and not have an adverse affect on oil pressure?

Yes and no. THe problem is the restrictor is that larger sized fitting thats there first from the stock feed line. It's a wierd ass thread that I couldn't find anything to screw into. It's not NPT or metric thats for sure. I ended up removing it entirelly and startwith with a reducer directly from the oil housing. This is why I went to -3 because I don't have the restrictor anymore, so the line is the restrictor.

If you could leave the restrictor in place you could run a -4 line because the restrictor will reduce pressure and flow though that small hole and it will be alright.

On ballbearing turbos' non of this applies, you run from the head.

 

[espinelli]

Appreciate the info and the beatiful picture . By chance, do you recall what size reducer you used on your oil filter housing? 1/2 or 3/8 NPT???

I would look myself but my car is about 1.5 hours away.

 

[DSMJim]

The line is 1/8th NPT. The restrictor was 3/8's I believe and was female 1/8th inside. I use a 90deg elbow as well to get around the corner so that the line didn't have to make that bend.

 

[boostcreep]

The line is 1/8th NPT. The restrictor was 3/8's I believe and was female 1/8th inside. I use a 90deg elbow as well to get around the corner so that the line didn't have to make that bend.

Iid like to revive this thread for a bit... Where can I find the restrictors and how long of a run will I need for the line. I have a Evo 3 with a 4 AN line with no restrictor and I'm now paying the price for not having a restrictor. I'm going to upgrade to a v-trim or H-3 turbo but need to rectify this problem before I move up. Any input is really appreciated.

Emmanuel

 

[sweet97]

AGP Turbo uses a -4an feed line from the oil filter housing and voids their warranty if it is not used. They offer the best lines, feed and outlet I have seen. The feed is a nice beefy -4an with the return being very large. They say the 360 degree garrett bearing needs the oil and it is also oil cooled so volume is important also. I would buy their oil line kit with both lines for a T3/T4. Mark

 

[boostcreep]

I'm using the stock return line. I dont perceive this as a problem. correct? Also, I'm using the line feed line from Slowboy.

 

[sweet97]

If the slow boy is a high pressure/volume line i would want a bigger than stock return line. Afterall where is the extra oil going to go if not back to the pan? seals? I would heck into a larger return line. Try AGP as it's a monster return! mark

 

[boostcreep]

ANd where can I find the restrictors?

 

[99gst_racer]

Yes and no. THe problem is the restrictor is that larger sized fitting thats there first from the stock feed line. It's a wierd ass thread that I couldn't find anything to screw into. It's not NPT or metric thats for sure. I ended up removing it entirelly and startwith with a reducer directly from the oil housing. This is why I went to -3 because I don't have the restrictor anymore, so the line is the restrictor.

If you could leave the restrictor in place you could run a -4 line because the restrictor will reduce pressure and flow though that small hole and it will be alright.

On ballbearing turbos' non of this applies, you run from the head.

DSMJim - I figured out what that weird thread is.... I left my restrictor in and replaced that smaller fitting inside of the larger one. The thread is 7/16-24 inverted flare. I then ran a 4AN line to the turbo.

 

[99gst_racer]

ANd where can I find the restrictors?

All 2G's have one from the factory. It is on the oil filter housing..... There is a large fitting that screws into the oil filter housing and than a smaller fitting that screws into the larger fitting. Then the factory oil line connects to the small fitting. That larger fitting is the restrictor. It's probably best to leave the larger fitting in there and then just relace the smaller fitting and run 4AN line.

 

[boostcreep]

I used the housing from a 1G, and switched the sending units....

 

[Burnett03]

There is a restrictor in the stock oiling system for the turbo that reduces it to roughly the size of a -3 to keep oil pressure from dropping. You don't want too large a feed to the turbo as it pushes too much oil though it. A -3 is the perfect size, you can mate up to and dwon from -3 to -4 for the oil filter if you have to.

You may find the turbo will push oil after a year because of the larger volume of oil its getting pushed through it, maybe not. I have been using -3 for 2 years now on my T3/T4 50trim and have had no problems at all. I went way out of my way to get -3 instead of -4 on somebody elses recommendation as well.

exactly what my 50trim is doing.. will a -3an line clear things up?