AO Silver Member
Join Date: Nov 2003
Location: United Kingdom
County: Perth and Kinross
Re: pros and cons of a induction kit on a 1.6 147
The Mass Air Flow sensor is 2 sensors in 1 unit.
1 It detects the temperature of the incoming air. BTW, the recorded temperature drops when more air passes into the engine. It works a bit like a venturi as the temperature drops due to pressure drop and air velocity increase.
2 Using a wire with an electrical current passing through it (Hot Film Wire), from predetermined programming, the ECM is able to work out the mass (irrespective of pressure) of the air entering the engine. This is more accurate than air flow which measures quantity and varies with pressure. Also, there is no vane to partly block and cause vortices in the inflowing air. The HFW is done by the ECM measuring the resistance of the heated wire which changes temperature and resistance due to differing quantities of air which exerts a cooling effect on the wire.
I believe the MAF unreliability is due to most aftermarket kits using a filter which is oiled for greater dirt retention in a medium (cotton gauze or foam) whilst still offering the minimal reduction in flow rate. The smaller the flow rate reduction in the filter, the better for performance.
The standard filter in the 1.6 is more than adequate. After all, this filter is used in the 2.0 also. It still will rob the engnie of power though, but the benefits of a kit are not as pronounced as the 2.0. The 2.0 should show an improvement of more than 25% greater than the 1.6 (working it out on enigne size alone).
The reduced reliability comes from lthe oil from these filters affecting the MAF hot wire. It can cause hot spots and cause the wire to break down faster than normal. However, if any issues are noted, prompt cleaning the MAF with spirit cleaner to wash the oil off should mean MAF life is not reduced.
That is what I have found from my experience.
[SIGPIC][/SIGPIC]Drive sideways- life's too short not to
Slip-sliding my way through winter. On four wheels and two.