320d Air filter trumpet modification?

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  1. 320d Air filter trumpet modification? 
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    What do you reckon to cutting the trumpet off that leads to the airbox inside the corrugated bit to aid airflow into engine?

    It looks quite restrictive!
     
     

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    Be pointless as Diesels don't work like that, they get plenty of air which is regulated.


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    Petrols have a regulated amount of air too - Tell me more?
     
     

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    I understand Diesels have no throttle body to regulate airflow, but the reason I ask this is coming from being a VAG man.

    The PD160 mod is well talked about in Seat circles. Basically installing the larger flow trumpet from the 160hp TDI engine to lesser models.

    If you whip the front top cover off, you will see under the concertina pipe that the actual intake pipe that leads into the air filter is very very small in comparison to the size of the hole it could be!
     
     

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    Yep, with a petrol engine, when you change the intake, you get more air in, and the ECU is forced to add more fuel to keep it at the correct air/fuel ratio, otherwise it won't burn or run lean and hot.

    Diesels on the other hand don't mind too much about air/fuel ratios, they'll burn what they are given and they are at the equivalent of wide open throttle at all times.
    If the engine is idling or cruising, it'll take in a full W.O.T load of air, but only inject a small amount of diesel, just as much as it needs.

    The airfilters are hugely oversized as they are constantly filtering huge amounts of air compared to a petrol and in most cases, there's so many different controls that the engine will always make the power requested by increasing boost or injection to get the same torque as before.

    As a result of this, you don't often see any induction kits for diesels, and even something like changing to a bigger turbo doesn't really show great improvements as it will be set to make "x" bar of boost with whatever equipment it has to hand.
     
     

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