[winders]

I worked with Oscar Zelaya to tune my race engine. He used to work at MoTec USA and now has his own company and works for the Cadillac GTP team. Oscar has tuned a zillion ITB-based engines and unequivocally said to use Alpha-N (TPS) to tune the ITBs…even for part-throttle areas of the tune. Setting up an air plumbing system to accurately read the MAP is problematic at best and likely inaccurate. You are better off using Alpha-N and a closed loop lambda setup with a lambda sensor for each bank. Of course you would have air pressure sensor to read barometric pressure as well so adjustments would be made based on that. It would also be good to have an ECU that could be given the injector flow profile based on fuel pressure.

With this setup and drive by wire, you don’t need an idle air control setup and you get rid of the vacuum hose mess…much cleaner and super reliable.