Robin, you asked about an AFM alternative.

[Martin in Bellevue]

So let me get this straight. You have no more MAF or AFM, but the air flow voltage signal that used to come from one of these now comes from the new unit. Instead of measuring volume (AFM) or mass (MAF) of the air going by, you use just the pressure & RPM to calculate the air flow signal that the DME *thinks* is still from the AFM?

You say the temperature is an input too... just into the DME or does the SS unit alter its calculations based on the intake air temp?
- Robin

Yeah, my 535 runs with no stock afm, no maf.
The intake air temp sensor is independent of the map stuff, kinda like it is with the stock afm. The stock afm has an iat sensor, that can be replaced by the seperate iat sensor from tha maf setup. The psc1 is able to accept 4 additional inputs to further modify the map signal. This doesn't seem needed, when the idle values are brought down to about 1.15v, matching the afm. The SS unit does not alter calculations based on intake air temp, as I have it set up now. It can be made to do so.