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Message: <blockquote data-quote="jinkl" data-source="post: 3371024" data-attributes="member: 3008"><p>u must understand the basics first</p><p>wht calculate the amount of air is the airflow sensor</p><p>wht commands the injectors to open up is ur ecu</p><p></p><p>so lets say u r flowing an amount of air, lets jst say 50cfm la kay, the flow in calculated in hz</p><p>the airflow reads it and passes it to ur ecu</p><p>at the mapping in ur ecu, it says 50cfm of air , 4000rpm , open the injectors for 20ms</p><p></p><p>so how now, u r using vr4 car n stuff bt evo ecu, bt 450cc injectors vr4, 20ms of fuel enuff ?</p><p>will it give a lean output or rich output</p><p></p><p>how if we change the whole scenario to another one, this time , vr4 hafcut , evo ecu, evo wiring , evo air flow , evo injectors, now at 50cfm of air , 4000rpm , ur injector open the evo injectors nice at 20ms , fueling ngam, but jeng jeng jeng , ignition timing for evo n vr4 is diffrent , evo is high compression which has lesser ignition timing, so how now ? u r running vr4 engine but ur evo ecu is giving low ignition, kantoi :P</p><p></p><p>so , the better way, change to a newer ecu , wiring and airflow is the minimal , make sure change in a set la, then the next is rechip or piggyback to fine tune it\</p><p></p><p>like the b8 180 and b8 210 pulak</p><p>if u put a b8 210 ecu in ur b8 180 , even the turbo flow amount is diffrent, mapping is all diffrent supposedly la , u still need piggyback or chip to fine tune it</p></blockquote><p></p>

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