The_Yukonator
Full Access Member
I just bought one yesterday.... i selected option 2 and took the "economy" tune... does anyone know what they change for this.... i dont want to loose any power.... i dont know if it is my imagination but i think the truck goes into "v4" mode more and stays longer in "v4" mode now.....
I don't know for sure about the V4 mode, but I know that it readjust the shift points in the transmission for more efficiency and adjust the timing and air fuel ratio for optimum performance and better MPG. I did noticed on mine that it did seem to give you more power even on option 2. Also you will gain performance in terms of the transmission settings because the vehicle wil shift gears faster, that is why you wil experienced that firmer shifting. If you use option 4 make sure that you fill the tank with premium fuel preferably 93 octane and drive it for a while before reprograming the ECM. I filled mine today with premium fuel and selected option 4(exterem performance) and because there was still some regular fuel in the lines I experience pingin in the engine. After the premium fuel mixed with the regular remaining in the tank and the lines burn the regular fuel that was remaining on them I have no problem other than keeping my foot of the gas :thumbsup: