I put a Biturbo on my 91 A35 and ended up not having to upjet. I did a plug-chop with the original jet and ended up with a wet plug. I did replace the jet with a new one of the same size #57 because I had to drill out the funk and thought that may be the issue. It must have been because the thing runs right, now. Nice brown and dry.
I'm rather baffled, but not unhappy. Any ideas?