-6AN too big for turbo oil feed?
07-31-08, 06:48 PM
#1
-6AN too big for turbo oil feed?
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?
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08-01-08, 08:47 AM
#9
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 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)
Last edited by arghx; 08-01-08 at 09:01 AM.
08-01-08, 09:23 AM
#10
Engine, Not Motor
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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. 
08-01-08, 09:34 AM
#11
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.
08-01-08, 12:06 PM
#14
Lives on the Forum
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
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
08-02-08, 10:24 AM
#16
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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.
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.
08-02-08, 10:53 AM
#17
Lives on the Forum
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
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
08-02-08, 08:59 PM
#19
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
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