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Thread: Do these mod boxes decrease full economy

  1. #1
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    Default Do these mod boxes decrease full economy

    If you drive normally do they give you better mpg or do they drink it for fun.

  2. #2
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    I think most say that they actually give better mpg

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    Regular Member Ian S100's Avatar
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    I have the CRD2 & my experience is that driven sensibly economy improves - I'm averaging 47 - 50 mpg on town / urban driving

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    Vehicle : Fiat

    Trim : Panda 100HP

    Engine : 1.4

    Year : 08

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    This is a 'grey' area,because it's between the fuel rail and the ecu the readings given on the trip computer could be wrong,when the ecu opens the injector the ecu is expecting a certain amount to be injected but because a box has been fitted the pressure is higher so more fuel is injected,hence smoke on heavy acceleration,how do the more expensive boxes work, do they still only plug into the rail or do more than that?
    Last edited by tyreman; 8th September 2007 at 19:39. Reason: asked a question

  5. #5
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    Depends on how you drive AND how the box is set.

    Some boxes are setup to give more low down torque with little or not increase at top end, these are good for economy if you drive at low rpm and in high gears.

    Some boxes are setup to burn fuel like it's illegal to keep it and produce and produce fantastic lbft and bhp.

    some boxes even claim to offer the best of both like the Spider box, with rpm detection and multiple maps that they automatically switch between in real time depending on how you are driving.

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    Regular Member parapaul's Avatar
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    When I had my spider box (after the initial couple of weeks of ragging it just because I could ) my consumption went from an average of 42mpg down to around 37mpg.

    Not bad though, just think how low the consumption would be on a petrol car with that kind of power!

    I think the companies claims that your mpg will increase are mostly theoretical, based on the fact that with more torque, you can stay in a lower gear, with lower revs and potentially use less fuel.

    As I said, I didn't. I just lived with it and enjoyed the power!

  7. #7
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    My god, are you driving around town constantly?

  8. #8
    Regular Member Gsi3.2's Avatar
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    it is low isn't it??.. even our failing 150 still gets around 48/49 MPG..

  9. #9
    Regular Member parapaul's Avatar
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    Nutron - Yes, all my miles are around town.....and a good chunk sat in roadworks traffic.

    Gsi3.2 - It is low, but I've never had any more from it. This tankful I managed 48mpg (indicated) but that was at 65mph on the motorway for 2 hours to Trax and the same back again. Never had anything even close to that in the last 2 years. It's down to 44mpg now after a week driving to work and back.

    However, it is an estate, and I do always have the AC on.

    I dunno. It's my car, I like it

  10. #10
    Regular Member Gsi3.2's Avatar
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    and thats all that matters..

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