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Message: <blockquote data-quote="ecupro" data-source="post: 1573842" data-attributes="member: 20434">Carnut,You quote :"Bro, what do you mean by same as "the blue"? Thought when running Open Loop all values will be based on the saved map in my SMT6? In Open Loop, all sensor readings will be ignored... so how can the stock ecu able to control all those things that you mentioned anymore?The performance difference that I am experiencing is during Open Loop. Hope you can explain more :) "Bro,You see, you can not do "adv" here. else thread will be deleted.If can, i aslo put my R & D ecu, PROTECH-II.Since you ask for it, well "the blue" is E-Management, " the silver" is Utimate. ok.On normally runing condition, the ecu will run to and fro, mean close loop and open loop dempend on sensors, like throttle sensor,when idel, ( throttle on zero position ), the ecu will swtich to close loop, or you swith on the air-cond, the ecu will try to control AFR 14.7, or when you swith on the head light ( loading ).Off cause, this also include the air flow sensor or map sensor.When you doing crusing, your throttle will be say 20 ~ 25 %, since your throttle position not move around ( may be a little bit ), the ecu will switch to close loop and use o2 sensor as a feed back to control AFR 14.7 or ever lower say 16.4Off cause, this also include the air flow sensor or map sensor.Most piggyback device will required to tap on some sensor.Crank or cam input for ignition control, +5 mean, after calculation from stock ecu, or call this ref and add 5 degree, in order to advance more.and the piggyback also have" ignition in" and "igniton out", in order to mod the signal for advance or retart.It also need throttle sensor input ,may be map sensor or air flow sensor, so that there can re-map or change the character of the input sensor. ( that mean there are intercept from the input sensor, then "the tune" signal will send back to stock ecu. If this signal or data fail to input to the ecu, all will be mess out, and off cause, engine check light will be on, that is very BAD for stock ecu )Correct me if i am wrong.( that is why the erase build on top of the pensil..he...he..he)So, learn wisely.Good Luck.It also need to tap on the injector output in order to control the fuel ( also after calculation on stock ecu )</blockquote>

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