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Thread: Does blanking your EGR really effect the fuel economy.What do you think?.

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    Regular Member felixx's Avatar
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    Exclamation Does blanking your EGR really effect the fuel economy.What do you think?.

    I was just wondering if all those members who have blanked their EGR valves completely have found any difference in the fuel consumption/power etc.The reason I have started this thread is to determine if blanking has any adverse or can,indeed,as many members have posted,have a real beneficial effect,or is it just their imagination?.FELIXX.

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    Regular Member felixx's Avatar
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    Quote Originally Posted by felixx View Post
    I was just wondering if all those members who have blanked their EGR valves completely have found any difference in the fuel consumption/power etc.The reason I have started this thread is to determine if blanking has any adverse or can,indeed,as many members have posted,have a real beneficial effect,or is it just their imagination?.FELIXX.

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    Regular Member felixx's Avatar
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    Quote Originally Posted by felixx View Post
    I was just wondering if all those members who have blanked their EGR valves completely have found any difference in the fuel consumption/power etc.The reason I have started this thread is to determine if blanking has any adverse or can,indeed,as many members have posted,have a real beneficial effect,or is it just their imagination?.FELIXX.
    I cannot understand why this thread was never posted for viewing.

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    Full Member GazVXLINE170's Avatar
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    Vehicle : Insignia

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    Engine : 2.0 CDTI [170 PS]

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    Feelix maybe you haven't given enoigh time for the correct people to respond.

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    Regular Member OPC's Avatar
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    Vehicle : Vectra-C

    Trim : SRi XP2 Nav

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    I have mine disabled via remap and can acheive 40-55 mpg, even managed 47 mpg with urban driving , a little painful tho.

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    I've heard that blanking the EGR valve on a DPF equipped Vectra helps the 'economy' no end.

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    Full Member GazVXLINE170's Avatar
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    Vehicle : Insignia

    Trim : SRI VX-Line Nav

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    Year : 2015

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    Quote Originally Posted by diesel dog View Post
    I've heard that blanking the EGR valve on a DPF equipped Vectra helps the 'economy' no end.
    What has that got to do with it?

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    Quote Originally Posted by Gazza4 View Post
    What has that got to do with it?

    Gazza4


    I'll explain.

    If you blank the EGR valve on a Vectra equipped with a DPF it will prevent the exhaust gases that burn off the soot in the filter from getting hot enough, thereby causing failure of the DPF and hence the requirement of a new one or a removal/remapping of one, hence the helping of the 'economy'.

    Theoretically, blanking the EGR valve will increase fuel consumption since neither the MAF or MAP sensor will have detected a change in inlet manifold pressure which would signal the ECU to alter injection timing and provide less fuel for combustion during the periods that the EGR valve is open.

    Have you got that?
    Last edited by diesel dog; 9th November 2010 at 01:36.

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    Regular Member rushy's Avatar
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    Engine : Z22SE (2.2 Petrol)

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    Here we go again LOL. As my petrol doesn't monitor the EGR flow as such my findings could add a different twist on things as it looks like it comes down to the actual burn. With it blanked I suffer about -2 MPG. Its especially evident in the winter months to the point where I'm thinking of putting the EGR back on. I always make comparisons to my old Mini with a stage one kit. You could have a heated manifold for economy.

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    Quote Originally Posted by diesel dog View Post


    I'll explain.

    If you blank the EGR valve on a Vectra equipped with a DPF it will prevent the exhaust gases that burn off the soot in the filter from getting hot enough, thereby causing failure of the DPF and hence the requirement of a new one or a removal/remapping of one, hence the helping of the 'economy'.

    Theoretically, blanking the EGR valve will increase fuel consumption since neither the MAF or MAP sensor will have detected a change in inlet manifold pressure which would signal the ECU to alter injection timing and provide less fuel for combustion during the periods that the EGR valve is open.

    Have you got that?
    This is one of the main reasons I raised the question in the first place.When I originally fully blanked the valve I really did seem to use more fuel but put it down to the increased performance that was available and my "enthusiastic" driving.However,since fitting a new valve,and not blanking it,my fuel consumption seems to have improved dramatically.What I want to try and determine is whether it is my imagination or is there a connection.Would I protect my inlet manifold by semi blanking together with the ccv set up just as effectively as fully blanking?. FELIXX.

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