[MA70-3.0GT]

Cool, not suggesting anyone "cheap out" on mods that handle the safety of your engine, just feeling out the limitations of the stock system. I was thinking the lex AFM body was mainly for increased flow capability with bigger turbos anyhow,
but the reading I did seemed to suggest that fuel cut would come in at a set KVAFM signal frequency regardless of duty cycle/rpm etc hence the larger unit would be required once fuel flow capability & boost were increased in order to make use of anything above stock max airflow rate.

Just one thing on the O2, I wasn't saying to USE a slower switching O2, was saying that if a Vf monitoring device was used it may help detect if the O2 was slowing down with age/damage. (though thinking on it I guess a wideband O2 sensor & a monitoring system directly signalled by it's output would be much more informative on the things that matter anyway)

It'd still be nice to have a Vf monitor as well though, with a min/max data hold to keep an eye on how much "reserve capacity" is in the ECU's map at a given boost & fuel system spec...



I suppose most of the information written in the link was written back when f-con's were in their infancy & he felt the lex/550 was a better solution than the then-basic programming of said f-con's, so maybe not so relevant now that the companies have had 10-15 more years of development time. I guess it's glaringly obvious I haven't really looked into any of them & really I should as they likely have all the monitoring capability & more that I'd ever need or want.

EDIT-: just thinking about it, using a MAP based fuel controller would eliminate the problem of AFM restriction completely, and in theory the fuel cut feature should still operate based on the injector's duty cycle right?