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Message: <blockquote data-quote="cuscostrutbrace" data-source="post: 4090420" data-attributes="member: 3867"><p><strong>Re: AFR for 20V on pigguyback or standalone</strong></p><p></p><p>For WOT and under load conditions,it is advisable to run rich for safety,i would say your 12.5 to 13 is just nice.You should not worried about fuel consumption when driving fast/redlining every gear because everybody knows fuel economy doesnt apply to that conditions,for fuel economy we concern on part throttle,low load AFR,it should be around range of 14-15.You can lean it up a bit in low load conditions but i wont go over 16 during cruising.Almost all factory ecu cruise at 14-15 AFR.</p><p></p><p>And also try to smooth driving style,coz if you stomp on the throttle abruptly,'async jet' or 'acceleration enrichment' will inject more fuel to cater for the sudden changes of Throttle position,hence you use more fuel.</p><p></p><p>Also dont put the car in too much load,some change the gear too fast because afraid the rpm climb up higher and use more fuel,but this does not always true,most ecu calculate fuel using load,if we change gear to fast and lug the engine on the next gear with low rpm to pick up speed,the load will become high and we end up using more fuel.</p><p></p><p>Also ecu will cut off fuel when throttle is shut and engine is above 1800rpm,make use of it to save fuel during going downhill or any other conditions that may not require engine power.</p><p></p><p>When tuning AFR,make sure check the ignition timing as well as this two is co related.I would go with AFR first then fiddle with the timing,then recheck AFR.</p></blockquote><p></p>

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