i decided to make some SS oil feed and train lines for my BNR stage 2 hybrid turbo. it appears that the stock oil feed line is between the sizes of -4 and -6AN. i decided to go with the -6 since its a larger than stock turbo. will this be okay? will i need a restrictor?

 

I believe you will need a restrictor....but don't quote me on that one. I'm no expert.

 

Smaller the better...
-4AN is okay.
-3AN is better.
-6AN is TOO BIG!


-Ted

 

even though -4 is smaller than the stock line?


****.

will i need a restrictor for a -4 or -3? if at all possible go -3?

 

I use 4AN with a flange that has a built-in restrictor. Your turbo doesn't need more than a pinhole worth of oil spraying into it given the amount of pressure. 6AN should only be used for fuel or coolant normally, and your return line should be 10AN.

 

I've got a -3AN oil feed line I can sell ya! I used it on my BNR stage 4. I'm pretty sure you'll need a restrictor.

 

-3AN...check out "brake line" with the teflon liner...


-Ted

 

do you have a link to this somewhere?



would jegs have this? i had to have them weld the fitting onto my inlet flange. they dont seem to know what they are doing over there.

 

I actually got the flange and oil line with the turbo, which I bought new from someone on the forum. But if I could guess, the kit I had (which didn't have fittings for the front cover, I had to put that together myself) is something like this: http://cgi.ebay.com/ebaymotors/T3-T4...07301155r36540

I think that's a two bolt flange with a 4AN male on the top. On mine if you look at it you will see the part of the flange that actually goes into the turbo is merely a pinhole.

You can also try this:

http://www.atpturbo.com/Merchant2/me..._Code=ATP-OIL1

but you will also need to buy a 4AN-->1/8 NPT fitting to connect to that. The 1st one I mentioned a two bolt flange, the second one actually threads into the hole itself on the turbo (if it is in fact threaded 1/8 NPT)

 

I've used -6 for years with both stock turbos and aftermarket turbos and had no issues. I find -4 is just too hard to work with, and it's more expensive then -6. That said, I've heard the hybrid turbos often have smoking issue so -6 may be too big as others have said. I don't use hybrid stock turbos and never will, so I can't comment on that.

 

with or without a restrictor?

 

The only turbo I've ever used a restrictor on is my GT40R.

 

anyone else have first hand experience with this?

 

T-70
13B-REW
-6AN oil feed

Excessive oil smoke from turbo
Problem solved when smaller line was swapped in.

I've heard of 13B-REW's killing (stat - front?) bearings due to too much oil pressure bypassing through the turbo from an overly large oil feed line.
This seems to be a problem for 13B-REW's in particular due to their higher oil pressures, but I'd be scared to test this on a 13BT.

Ask any competent turbo shop, and they should all tell you -6AN is overkill and unnecessary for a turbo oil feed line.


-Ted

 

I've got an FD oil pressure regulator, I might add. So I definately needed the restrictor.

 

I've not seen any issues running -6 on a stock turbo with 100 PSI oil pressure. Then again, I tap my oil from the cooler so I didn't even consider starving the front bearing.

Now of course I'm running -4 from the secondary filter to the turbo, and a restrictor. I'm thinking of pulling the restrictor though since my idle oil pressure is low and the GT40 is internally restricted.

 

Forgot to add something...
That T-70 that I saw smoke did run a dynamic (compressor) bearing.
The dynamic bearing has been known to leak at low (turbo / turbine) RPM's.
The stock turbo does run a carbon (compressor) bearing.
Most of the Garrett (type) turbos do run dynamic bearings.


-Ted

 

i got a -4 line today

 

i ran a -6AN line on my t64E(360 dynamic seal and gapless turbine shaft seals)with FD front rear regulators and high flow oil shaft jets(they help lowering the oil pressure at idle)and the turbo was smoking and burning oil like crazy(a lot)i changed the setup to a -4AN and problem solved

 

the stock turbos or the bnr turbos have built in restrictors.

btw, heres how i did mine.

http://www.tristatetuners.com/forum/...ad.php?t=24997