RB26 GT35R oil/water routing.

Discuss the RB20, RB25 and RB26 series engines.
Nesquick
Posts: 393
Joined: Wed Oct 15, 2008 5:59 pm
Car: Rb26 Kouki Silvia

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k so im about to piece together some SS lines / Earls fittings for my turbo. I have things pretty much mapped out

Image

#1: Blocked Off
#2: Oil Feed to turbo (M12x1.0 to 4AN?) <-- correct size? also, do i need a restrictor for a gt35r? if so, what size?
#3: Turbo Drain 3/4"
#4: NOT IN USE
#5: NOT IN USE
#6: NOT IN USE
#7: Water Feed to Turbo (size unknown)
Water return is going into the thermostat housing.

can anyone help me out with the fitting sizes?


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StricNyne
Posts: 3725
Joined: Thu Oct 30, 2003 1:11 pm

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if u do a search for stainless fittings rb25 and my name u should find something i think i have most of it posted up

ItzGenX
Posts: 1204
Joined: Wed Sep 04, 2002 7:46 pm
Car: Smoke Purple 95' S14.5. Powered by the "Iron Man".
Location: Gulfport, MS
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Block oil feed thread size is 12m x 1.25m (-4AN best size)
Block water feed thread size is 14m x 1.5m (-6AN best size)
Turbo oil feed thread size is 7/16" x 24p (flared like a brake line)
Turbo water feed and exit are 14m x 1.5m (same as block)

If you do not want to get overly fancy for the oil drain to the block, you can get a -10AN adapter for the turbo, -10AN line fitting, and a -10AN line. When you hook the line to the block, you can just hose clamp the line to the block while fastening the -10AN end to the turbo itself. #4 in the picture is the water return line, and #5 is the boost line to the factory boost solenoid. For #1 and #3, it doesn't matter which one you use to drain the turbo with.

gawdzilla
Posts: 2028
Joined: Sat Sep 18, 2004 11:51 am
Car: none

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switch 1 and 3. it's easier to block off 3 with a small metal plate. use 1 as the return with a 3/4" npt to -10 fitting. npt will fit fine.

Nesquick
Posts: 393
Joined: Wed Oct 15, 2008 5:59 pm
Car: Rb26 Kouki Silvia

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yea i was looking it over with a buddy and decided #1 would be the easiest drain.

the reason why #s 4,5,6 arent in use, is because it aint there anymore lol.
i stole the pic from another site and just used it as an example.


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