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I'm planing on build an LS/Vtec and iwas wonderring, can I use an APEXi V-AFC as a Vtec controler with my Ls ECU (P75), insted of buy a vtec ECU (P30, P72, etc)?
Yes, you can do that, or use an RPM activated switch, but you won't have the VTEC fuel map, so you'll need to tune the AFC to account for that. Not much you can do, fuel map-wise, with an RPM activated switch.