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Looks like Alpha-N system... (archive)

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Posted by JamesM on October 04, 2000 at 08:25:25:

In Reply to: Here is a pic of this intake on an S-14 posted by MPike on October 04, 2000 at 07:52:12:

This is used where you delete the AFM and program the chip using a MAP (manifold air pressure) sensor. This kind of tuning is VERY temperamental, and must be re-tuned everytime you change something, whether it's a muffler, cams, header, throttles, etc... The AFM is a restrictive, but it measures the actual amount of air going into the engine. The Alpha-N system has to guess how much air is going into the engine using a throttle position sensor and a MAP sensor. Several E30 M3 guys put them on their track cars, but they say it always runs a little funny. There is quite a power gain realized with this system, but I discourage using it for any street car. Convert to a MAF (hot-wire air mass sensor) if you think the stock AFM is choking you. I believe the Evo3 cars used an E28 535i AFM in place of the original.

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1988 M3 Henna
1983 535i

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