My spacers will have to be around 16-20mm (will work it out exactly soon) to regain turning circle (in combination with the 80mm narrowed beam).
In response to your question, because every setup is slightly different (brakes, spindles, pan/beam used, body, fender width etc etc)....it would only be a guess if you'd have a good turning circle unless you find someone with exactly the same setup. Here is the clearance on my beetle - stock fender width with the aforementioned suspension setups.
