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[Paul K]

Out of interest I was looking on E-bay and I noticed that there are a number of Vectra 2.5 V6 plenums being sold. would it be possible to fit these on to my 2.5 V6 engine as they have a single inlet so it can be fitted with a K&N filter system. also being a later design I would hope it is a better design? I guess the main problem would be the connections for the ECU?

[Andy B]

Stick with OE  , far better set up than K & N type  

[Paul K]

How do you work that out? cold air is much better than warm air going into an egine because its denser so when it mixes with the petrol which is controled by the ECU is fired by the plug it exspands more giving more power.

[Elite Pete]

The original filter is large, enclosed and fed from a pipe leading from infront of the radiator so will get lots of cold air a K+N is open and situated inside the engine bay, OK you might be able to fit a pipe to direct air at the K+N but it will still suck loads of warm air. The other thing is the K+N is oiled and the oil will knacker your MAF sensor.    

[Andy B]

How do you work that out? cold air is much better than warm air going into an egine because its denser so when it mixes with the petrol which is controled by the ECU is fired by the plug it exspands more giving more power.

The OE set up gives you exactyly what you've described! How can you do better than that?  
When you mentioned K&N I just thought 'red cone filter in the engine bay'

[TheBoy]

stick to Standard, its far better than any aftermarket.  And you also keep the multirams with smoothen out torque curve.

Vectra one is compromised to fit in the smaller space

[TheBoy]

oh, anf use GM filter - pattern ones have less surface area

[Richard148]

The original filter is large, enclosed and fed from a pipe leading from infront of the radiator so will get lots of cold air a K+N is open and situated inside the engine bay, OK you might be able to fit a pipe to direct air at the K+N but it will still suck loads of warm air. The other thing is the K+N is oiled and the oil will knacker your MAF sensor.    

why does an oiled filter Knacker the MAF sensor? :-/

[Entwood]

The MAF has a very thin wire through the centre that is used by the ECU

It uses a well established hot-wire principle. A hot wire and an air temperature probe are mounted together in the inlet duct. The hotwire is maintained at 200°C hotter than the air temperature probe, and the current needed to maintain this temperature is connected to a precision resistor.

The principle is simple. The heated probe is cooled proportionally by the mass of air which passes it in the duct, so the current required to heat the probe varies according to the mass of the air passing through. From the voltage reading in the resistor the PCM can then assign an accurate measurement of the air flow and map the quantity of fuel to be emitted by the injectors

The oil from the filter "coats" the wire and stops it performing its job. It is EXCEEEDINGLY sensitive, so any contaminant is bad news.

I can't find an Omega piccy but this one, from a Ford Scorpio site gives some information that might be usefull

http://www.fordscorpio.co.uk/cleanmaf.htm

[Richard148]

The MAF has a very thin wire through the centre that is used by the ECU

It uses a well established hot-wire principle. A hot wire and an air temperature probe are mounted together in the inlet duct. The hotwire is maintained at 200°C hotter than the air temperature probe, and the current needed to maintain this temperature is connected to a precision resistor.

The principle is simple. The heated probe is cooled proportionally by the mass of air which passes it in the duct, so the current required to heat the probe varies according to the mass of the air passing through. From the voltage reading in the resistor the PCM can then assign an accurate measurement of the air flow and map the quantity of fuel to be emitted by the injectors

The oil from the filter "coats" the wire and stops it performing its job. It is EXCEEEDINGLY sensitive, so any contaminant is bad news.

I can't find an Omega piccy but this one, from a Ford Scorpio site gives some information that might be usefull

http://www.fordscorpio.co.uk/cleanmaf.htm

Thanks for answering

[Marks DTM Calib]

LOl, was reading a report form a rolling road day for Vectras.....they had a 150Bhp diseasel CDTi which produced 149bhp on the rollers. They then fitted a KandN and it produced 146bhp!

Which to me , was no surprise!

[Ralph]

On the subject of the MAF, can it be cleaned as per the Scorpio info.
I cleaned my Scorpio MAF as described and it made a huge difference.