work in progress

iTrader: (2)

Does speed density use data from O2's?

LSX Power Tuning

iTrader: (4)

There is SD in OL (open loop) which doesnt use the O2's or SD in CL (closed loop) it WILL use the O2's.

Ferocity02

iTrader: (60)

Speed density basically means the airflow is being estimated from the VE table instead of measured by the MAF sensor. You can still use O2's with SD (closed-loop) or not (open-loop).

EFILive's custom operating systems have something called semi-open loop which uses the short term fuel trims only instead of a combination of the short and long term fuel trims. This is what I'm running now with SD and it works pretty well.

redtan

iTrader: (5)

Speed density means a lack of MAF input, not necessarily that it will or will not use O2s.

As mentioned, open or closed loop is what differentiates between a tune using or not using the O2 sensors.