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Message: <blockquote data-quote="cuscostrutbrace" data-source="post: 1154165" data-attributes="member: 3867">HIAcoustic..ISCV where got 3D maa..hehe,maybe u enter other map,FREEDOM have six 3D map,that is:-1.FUEL map = normal la,all ecu 3D nowadays(main map)2.IGNITION map = also normal(main map)3.THROTTLE map = Some ecu have,some dont have4.AIR FUEL RATIO map = Some also have,some also dont have5.ALTITUDE COMPENSATION map = Most aftermarket dont have,only few have this map (or feature)6.VVT map = Also most aftermarket ecu dont haveIt also have so many other parameters which would take too many posts to explain here,normally main parameters are water temp and air temp.The ecu calculates its final injection time using multiplication factor,some other ecu's using addition,which adds or substracts to the base injection time,however both ways to produce same results,which is to add or substract fuel.I prefer multiplication though,:regular_smile: Example:- During cold idle the base injection time 2.5 mS,water temp multiplication factor is 1.8,air temp multiplication factor is 1.5,throttle is 1 hence we get=6.75 mSThen after warm up,base injection time still same,but water temp factor have drop to 1.1,air dropped to 0.9,throttle is 1,hence we get=2.475 mS,see the final injection time is lower than the base.All the other factors determine the final value and of course all these factors value can be changed accordingly.There is also other factors,but lazy to write,tired..hahaThe factors only affects on fuel injection time(i think),ignition is not affected,whats written on the ignition map directly applies to engine,only corrected by knock control.For ISCV,no map at all but it got 2 menu for controling the idle,one is idling stabilization revision and the other is idle speed control,iscv falls under the latter,which we can set what idle RPM we want according to water temp,and the ecu will play with the ISCV(and some others) to achieve the target RPM.If what i explain is wrong,sifoo2 please correct:regular_smile:</blockquote>