I have an 05 taco, URD maf cal, LC-1/XD-16 combo, Volant intake, and flowmaster exhaust. My question: is there a way around closed loop? ie some sort of voltage clamp for the coolant temp? If the ECU thinks the engine is cold all the time it will run open loop and could be adjusted via the piggyback right? I installed my volant tonight (btw a total piece of crap, nothing fit, should have got the urd tcai) and noticed that my AFR went from a near perfect 12.5 to around 11 at WOT, and the fuel trims were also way rich. While retuning I thought that it would be cool to write a complete map across all rpm's myself, and wondered if this was possible. Also is the reason the AFR's went rich because the volant flows LESS air than stock?