2G violent shutdown

[SleepingTalon]

Well, fpr overrun is actually likely, although only at idle, not WOT. Anyway, it can be a helluva problem because of the closed loop problem it causes. At any rate, it's not "necessary" to have both, but it is optimal. Infact, most of the time, I dont worry about the afpr until about the 400whp mark. I get an EMS in the car first, and offset everything through that. Of course, if all you've got is an SAFC, well, then things become more difficult. I would say that if you're gonna use something to change MAF voltage, then use the afpr as well, but if you have something to control both fuel (via maf voltage, or actual pw) and timing, then I wouldn't worry about it. That's why I say one or the other. It really just depends on the setup. In his case, the setup is pretty simple, and doesn't require a whole lot to get it where it needs to be, so just an afpr would make things, although not perfect, "driveable" for him. I was merely speaking on the bare minimum to get the car driving ok.