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Speaking for S13’s:
I set up SOHC’s and DOHC’s the same way when you’re stock or N/A and retaining EVAP or just trying to capture fuel vapors (some places are UBER F***ing anal about looking for this).
-I run the 1/4” line from manifold to canister. (Vacuum source between throttle body and engine)
-I run 5/32” line (w/ the factory restrictor installed in the line!) from any source between throttle body and MAFS. Preferably the throttle body nipple. This ensures purge during partial throttle / cruise situations as intended.
—> Retain OEM check valve.
I have ran multiple cars like this for 8-9 years.
Once you go turbo it’s up to you what you want to do as shuttle changes must take place.
What I do for simplicity is delete canister, EVAP, and all the bullshit. I utilize the existing hardline under the car, hook it up to tank vent, then at the other end I put a hose on it and either a) run it to turbo intake or b) put a filter on the end of hose and lay it REALLY close to air filter for turbo intake. Both methods work.
The potential for fuel vapors to gather under hood are slim, but DO exist. I’ve ran it this way for a year or two.
The other simpler option is running the filter to rear bumper or some location out from under car but preferably higher than fuel tank.
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