I wrote a DIY for adjusting the Z3 OBC (62-13-8-377-996), but it is also applicable to the 318ti, namely:
E36 318ti Compact, M44, AUTO (CG83) : ADDITIONAL INSTRUMENTS
E36 318ti Compact, M42, AUTO (CG63) : ADDITIONAL INSTRUMENTS
E36 318ti Compact, M42, MANUAL (CG53) : ADDITIONAL INSTRUMENTS
E36 318ti Compact, M44, MANUAL (CG73) : ADDITIONAL INSTRUMENTS
Useful for correcting for larger fuel injectors (with the
Seattle Circuit Fuel Correction Circuit).
See here:
http://forums.bimmerforums.com/forum....php?t=1280417