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Message: <blockquote data-quote="TauhuTauhu" data-source="post: 1152394" data-attributes="member: 3990">fandango, there are only 2 maps in an ecu.only fuel map and ignition map.the 'map' is actually juz like a table...a graphthis 2 maps has their own values according to 2 main factors...called the load sites and speed sites.speed site is the speed on the engine(according to crank sensor/distributor and such), while load site is the load of the engine (according to TPS, afm/map sensor/hot wire).whn the signals are accpeted from the sensors telling tht the engine is at certain load sites + speed sites, the ecu will look up the 2 maps (or u can call it tables/graphs) and then apply them on the injectors and ignitors...other than the load sites and speed sites....factors such as enginetemp, air temp, batt voltage, AFR frm o2 sensor, knocking condition, sudden throttle opening/closing, cranking condition and such will also affect the "map" values.but the basic fuel map and ignition map are still there. the ecu will only add or deduct the appropriate values from the basic maps to suit the engine condition.it's not correct to say tht the ignition map is going to affect other map. because the maps are set according to the speed, load and also the small factors. so only speed, load and those small factors will affect the 2 maps.each map will not affect one another.it's like u set the fuel map for different speed + load + engine condition correctly with correct AFR. and then u work on the ignition to get the most advance ignition for every speed + load + engine condition juz before pinging/knocking to get the most out of the engine.people seldom work on ignition mapping simply because fuel mapping is allot easier to be done according to the AFR and they do not bring instant or massive damage to the engine during the tuning process although small mistakes are made like a little bit too rich/lean.hope this helps :)</blockquote>

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