I have been thinking about this ecotec device
ok, here goes
With a vane type (Flap) airflow meter - as used in a lot of older car designs.. it is theoretically possible to allow a small amount of extra unmetered air into the engine via the servo vacuum pipe ..
because this air doesnt pass the airflow vane or flap, the ecu doesnt see it.. the ecu sees less of an air demand and reduces fueling proportionally yep ??
result (providing you are within safe lean running limits (and thats dodgy on its own !!!) then you MAY use a fraction less fuel.. at the risk of running lean mid range..
Ok, now, on most clios, the fuel misture is calculated from a MAP sensor (Manifold absolute pressure) sensor.. there is no air flow flap or vane !.
so, what happens here ??.
well, lets think about it.
extra air is allowed into the induction plenum of the manifold via the servo pipe and ecotec ...
BUT >!!!!!.. it is calculated by the ecu due to it effecting the overall pressure in the manifold ? yep ??.
so, result.. = NOTHING !!!!!.
I therefore pronounce it pointless
all you are doing is adding an air leak in the inlet manifold..
think about it and let me know..