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'''BMW M42''' 4 cyl Choose '''M50 NON-Vanos : M42 harness is same, just some pins will be unused (4 cyl not 6cyl)''' ---- If you have any notable deviation, write details (pin / function) on this page, and we will investigate. You can use the [http://vems.hu/download/v3/Motronic88/M50-vanos-vs-s50b32.xls M50 Non-Vanos] column as reference ---- '''MAP''' *planning on '''removing the original AFM''' ** good * so I just need to connect the map sensor up to the inlet? just before the TB? '''MAP is an abbreviation, => capital letters: Manifold Absolute Pressure''' * Manifold, is by definition, AFTER the throttle, not before. ** think about it: how would the ECU know the MANIFOLD pressure if installed before the TB ? speed_density = RPM + Manifold Absolute Pressure based control; ** without turbo - NA - it would be possible to tune by alphaN=TPS , but tuning that is very laborsome; ** with turbo, removing AFM is OK, but MAP is needed ! ** 6/4 pneumatic tube is normally used for MAP signal (the manifold always has nipple that can be used) ---- '''LSU4''' > wideband there is original wiring in the engine bay ? Factory loom has too few wires. So small loom is provided (included) for the LSU4.9 or LSU4.2 (both have 5 wires; connector is different). Which is best to use for my engine? * '''LSU4.9''' is more available, and will be more available in the future. * it is said, that LSU4.9 is more durable during normal conditions ** however, some tuners say that under quite a bit of abuse, LSU4.2 can be more durable ** LSU4.2 is mostly ordered for compatibility (old installs with LSU4.2 connector - perhaps with old fw that would need work to be upgraded and verified/tuned) ** '''new installs normally use LSU4.9'''
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