de tuned no hes just adjusted the co level at the airflow meter.... doesnt make much difference to performance...
the ecu automaticly adjusts the air to fuel ratio...
this is what the air flow meters for to measure the temp of the air and how much is the engine sucking in... the ecu montiors infomation sent from the temp sender, airflow meter, knock sensor, hall sender, ignition module,throttle sensors,
and then the ecu works out how much fuel needs to go in.. and also keeps the ignition timing spot on....(once set ok) it sets itsself!
without replacing parts you cant de tune an engine.
you can mess with the timming, co, and idle level...
the fueling is ecu set.......
he's more than likely tuned the engine to make it pass the emissions checked the spark plugs and rotor arm etc etc...
to make then car run as vw intended it called tuning!
to make it go like a rocket its called performance tuning!
welcome to the dub world.........enjoy!
