I've done a NA to turbo conversion recently (nearly done), here's some things that might help you;
Oil feed line:I converted everything to AN4.
I dont use oil source at oil filter, but I think its M10x1:
https://www.aliexpress.com/item/4000557788387.html?spm=a2g0o.order_list.order_list_main.17.292279d2mrucmKI got the 36 inch;
https://www.aliexpress.com/item/1005005195080278.html?spm=a2g0o.order_list.order_list_main.210.292279d2mrucmKAlso my turbo (VNT15) takes M10x10
What I do is I run it from the head's oil sensor;
My head is mechanic so I figure it doesn't need as much oil as the hydraulic one.
Valve coverTurbo will pressure the crank case more than NA, the camshaft plastic plates all got warped, so I added first an oil catch can instead. Although it filters out all the oil there's alot of it. After adding the puck before the oilcatchcan it almost got rid of all the oil; I got the OE 028 129 101 E one from the Golf 4
https://www.autodoc.nl/febi-bilstein/8764455You can take the old breatherhose and it will fit this puck really nicely.
Maybe you can only with the puck (and no oil catch can). I did a little test and it doesn't seem to throw oil like before;
Before;
https://www.youtube.com/watch?v=rDFbu9EiCSUAfter;
https://www.youtube.com/watch?v=2g3YFQouhjoOil coolerI've done some investigations on the oil cooler, what water coolant pipes to route it over etc etc. From what I understand it's mostly used to get the oil temperature up to speed quicker. If you don't overheat things and change oil frequently I think it should be fine.
Oil pan connectorI converted things to AN10;
https://www.aliexpress.com/item/32402577938.html?spm=a2g0o.order_detail.order_detail_item.9.6ac9f19cxpE3s6 for the turbo
I got the "no weld" fitting;
https://www.youtube.com/watch?v=G6AflG3k3ioTo be honest, for my piece of mind I would get a welded one. The teflon seal is very flimsy and if you overtorque it (like I did) it gets squashed. No oil leaks though (yet) but I'll probably redo it with a welded one in the future.
Also to get the return line just the right length is kindof hard, its now like this and leaking a from the return connector of the turbo. I'll properly tighten up everything soon
The original one (the right with red connectors) was rubbing against the driveshaft
I also added a blow of valve on the intake side to 14psi (1 bar) to prevent overboost. No intercooler though, I'll run it at low boost (5 - 10psi). Piping is as follows (I can give you all the specific items if you want);
Note the fuel filter, it's very sturdy even on 1 leg
Final result is here;
https://www.youtube.com/watch?v=YULKMPq0eE4After attaching downpipe the turbo spool sound disappeared
I'll maybe do a muffler delete later on (and keep the resonator)