oil return and feed line size

[norwood e30]

Hi I Want To Order The Lines
Oil Return
Oil Feed
And The Line From The Oil Pan And Up If Any Of You Guys Can Help Me Out On This That Would Be Cool Because This Is Not To Easy And Its My First Projects So Ht Me Up If You Can. Thanks
Garrett T3 Turbo Oh Yeah Also The Intercooler Size As Well If You Can. Thanks Again.

[benflynn]

3an feed, 10an return

[ForcedFirebird]

I used a -4an on the supply and -10an on the return, no problems. The intercooler should be as big as you can get in the space you have, the cooler the charge the better.

[blueapplesoda]

dude capitals...stop it please its worse than TYPING IN ALL CAPS. oh and for ball bearing turbos use -3, journal bearing you can use -3 if its a smaller turbo or -4 for a larger one. dont restrict it, you'll cook the turbo.

[blueapplesoda]

also too large of an intercooler with a small turbo will affect boost response and you will have more of a pressure loss than with a smaller ic, but nothing really that noticeable. usu, bigger is better.

oil drain line, use a 5/8" oil/fuel hose should be fine, wrap it with some heat insulation to protect it from the turbo mani. otherwise -10 is fine.

[norwood e30]

Would a 4 AN (4 ft.) Fine for oil feed lines
And for return should be 10 AN (12 in. ST/ST)
10 AN (14 in. ST/90)
10 AN (16 in. ST/ST)
10 AN (18 in. ST/ST)
? What do you think?

[ForcedFirebird]

Would a 4 AN (4 ft.) Fine for oil feed lines
And for return should be 10 AN (12 in. ST/ST)
10 AN (14 in. ST/90)
10 AN (16 in. ST/ST)
10 AN (18 in. ST/ST)
? What do you think?

The Garrett T3 has 1/8" NPTon the top which equates to -4an. As recommended by Garrett, return line no larger than -10an or 1/2" (inner diameter).

Blueapplesoda, you are right about an intercooler that is too large will slow down spool rate because as the charge expands, it slows for a moment.

Also make sure your charge pipes aren't bigger than 2.5".

Click here to go to turbosbygarrett.com

[ForcedFirebird]

Would a 4 AN (4 ft.) Fine for oil feed lines
And for return should be 10 AN (12 in. ST/ST)
10 AN (14 in. ST/90)
10 AN (16 in. ST/ST)
10 AN (18 in. ST/ST)
? What do you think?

The supply can be as long as you want, since it is the pressure side it doesn't even matter if it has a loop in it.

The drain, however, needs to be the exact length and needs to run downhill from the turbo to the pan. If it goes up hill at all, you can get oil cook and your car will smoke on startup. The seals in a turbo work under pressure only. This means if oil sits in the turbo after the car is off, it will seep into the compressor and turbine housings causing your car to smoke (quite embarrassing too, lol).