Ok tell me what exacly you will have using lambda? how all system will work ?what afr will have in diferend rejimes what happens with fuel consuption? My way is tested from me i so that it works and i told to people wat i have done and what will hapen i am shore that your way is wrong it is no good and even can destroy turbo engine. I tryed with lambda in the begining and i was't pleased.
I hope i have understood all what you have wrote, my english is so bad, that i do not understand all the words you have used.
Ok, now to what you have asked, for what we can use lambda. If you do not have lambda connected A/F ratio is only measured by rpm's, in your case you intercept signal with SMT6. Even then you do not have in every case the most optimal A/F ratio, because you use the cell of Motronic's map which is calculeted by using the factors it gets from rpm & tps signals. Most likely you have taken this in concern and have defined richer ratio just to be sure not run too lean and have knock situation. When you use lambda (wide band) you can use lambda to adjust A/F ratio just to correct which mean Motronic can use the correct cell of it's map depending on what the engine load situation is. When you have this, it also save fuel in the most cases. I know many turbo charged Motronic engines are operated without lambda; i have done that also, and also do it especially when i step-on-it and drive more enthustiastic, especially on track use. It's easy to have lambda connected and use in Motronic area code plug with resistance and a switch, so i can just turn the lambda on or off when needed, when just cruising i prefer to have lambda adjust on, so i get the best possible A/F ratio, save the engine and save some fuel as well.When you have a WOT situation, then Motronic does not use lambda even if it is connected.In that case Motronic use WOT MAP. I usually configure that part newly because original WOT parameters does not work properly with turbo use. I suppose you use that extra SMT6 with extra injectors to full fill the additional fuel need of wot situation. What come to use of SMT6 or any other piggy back, i do not see it madatory to use, i prefer proper chip made to the configuration i am using, it just needs some information how to configure Motronic binary file, proper programming tools, like Winols (also motronic editor will do), some dyno time and eprom programming tool, so you can burn your new program to eprom which you then use in your cars motronic box.Check out time perioid factory made Motronic Turbo installations.All of them use lambda, so they are safe and use of lambda does not destroy these engines. Factory systems use also in the most cases knock sensing systems to reduce boost and also to adjust timing. I made my first BMW Motronic programs back in 1990, when we converted my friends ½ years old 325I to 327I with ETA crank. back then cheap Ebay chips for that configuration were not available, so we used as a base loaned Schnizer & Hartge chips codes. Hope you understood what i tried to explain here, english is not my strongest lanquage. You have done a great job there, most of your work i do accept some of it i might do a little bit different. Keep on doing good work, i hope you understand i do not have anything personal against you.
