Im trying to confirm if the lower road speed per engine rpm from changing the diff ratio to a lower gearing have any affect on the electronic engine management of a 1kd engine .
I have investigated this through a toyota electrical diagram and can see the the vehicle speed is sent to the ecu but I cant see where that info is used in the engine management systems .
My car is a 2010 kun 26 base model sr . No abs , no power steer , no cruise control .
Perhaps the road speed is distributed to other vehicle modules via the ecu for cruise control etc etc and no engine management functions use this info .