In a word, nothing! Our Leon ST is officially described on the order sheet as a 1.4 EcoTsi. Active Cylinder Technology is I believe the official VW description although Audi seem to call it Cylinder On Demand.What's the difference between FR TSi ACT and FR EcoTSi in the mk3 Leon?
At low speeds I can hear the engine shuddering and minor lurches as it engages/disengages.
Likewise. After 20K ish miles from new the ACT on ours is still undetectable apart from the indicator light in the dash. It does seem to be one of those things that on some cars it's noticeable whilst on others it isn't. A bit like the turbo actuator rattle.I've heard people say that before but on my car I cannot feel when it switches on and off. It's totally seamless and undetectable. With the windows down you can hear a short chirp as it comes on and off but you can't feel anything at all from inside the car.
Likewise. After 20K ish miles from new the ACT on ours is still undetectable apart from the indicator light in the dash.
On my 1.5 TSI i had you could tell when it engaged / disengaged ACT, you could feel it on your right foot.
What's the difference between FR TSi ACT and FR EcoTSi in the mk3 Leon?