Time to update this thread... Solved the interference problem with the turbo oil return line. First failed attempt used some cheap-o E-bay AL flanges with -10 fittings. These were machined in one piece. As it turns out, the turbo flange also fits the front cover, so I picked up two of them and the needed -10AN line & fittings to get from point A to B. Problem was the sub-standard AL used on those flanges was so soft that you couldn't tighten the fittings enough to make a reliable leak-free seal that would hold over time & miles driven. After less than 20 miles test driving, they started leaking, and tightening down a little more stripped the threads on the flange.
So then I got in touch with David Garfinkle of Garfinkle's Motor Works, and he fabricated a set of -10 AN/JIC custom fittings for me. These are a work of art and made of steel with proper fittings. No leakage problems now! I decided to retain the short stock return pipe on the S5 that bolts up to the front cover, add the Garfinkle's flange at the end of that, put the other Garfinkle's flange on the turbo and connect the two with -10AN line. There's a 90 degree fitting under the turbo, a short length of -10AN hose (< 1 ft), then a 60 degree fitting at the other flange. Picture below shows the result from the front cover side, where you can see how the 60 degree fitting routes around the extended OMP. I tried with 90 degree fittings at both ends, but that still interfered with the OMP.
01-07-2012, 10:20 AM
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