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Thread: Baffled by tuning boxes

  1. #1
    Full Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

    Default Baffled by tuning boxes

    Hi everyone, I've been looking at the range of tuning boxes available for the CDTI-150, but am confused about three things;

    Firstly, there seems to be a huge variation in price. Some boxes can be found for less than £100 and claim to increase power and torque by 20-25%. At the other end of the scale there are boxes costing £300+, but claim only marginally better gains than the cheap ones (around 25-30%).

    Secondly, in all cases these boxes seem to connect into the wiring to the fuel rail. Does this mean that they work simply by increasing the fuel pressure - for they clearly can't affect injector pulse duration from this location. This raises two further concerns for me;
    1. If the fuel pressure is increased, does this put more strain on the pump, with the potential of premature pump failure?
    2. I thought the turbo boost pressure also needed to be increased in order to provide enough air to burn the extra fuel. Surely increasing fuelling alone would result in excess soot and possibly damaged DPF?

    Thirdly, Some boxes seem to offer switches to adjust the box settings. What is the benefit of paying extra for this feature?

    Sorry this is a lot of questions - but I wan't to be sure before I spend my money and the commensurate increase in insurance premium!

  2. #2
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default

    Wait for Nutron to be along he is the guru on the 1.9,

    However my 2 pence worth is

    Yes most (but not all) boxes just increase fuel pressure
    You will generally be much better off with a remap
    If your getting a remap spend the extra and get a custom map from a reputable place that know the 1.9 and who will ask you about what you want from the remap!!
    Always get an RR before any remap / box and another after (from the same place on the same day etc etc )

    As I said Nutron is the man to speak to, and im sure he wouldnt mind if you dropped him a PM

  3. #3
    Regular Member m111kan's Avatar
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    I paid £150 for a 12 month old DTUK ECO3 box off a member on here for my 150. the ECO3 is a common one used by us on the forum & is adjustable as you mentioned.

    this was over £300 when new and ive had no problems with it, so you dont have to pay massive amounts for a good one.

  4. #4
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    Default

    hi, i am running a dtuk green eco 3 box,bought for £100 of ebay second hand (boxed/instructions ) the guy let me try it first before i handed the money over. i went this route because i don,t keep a car long,and can take it off and sell it again. it also cured a slight flat spot i had. never had it on rollers ,but power is just like on my old two stroke bike ,nice and steady then bag its off. could try this one if you lived closer.......

  5. #5
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    Default

    You can now buy a box that also has the ability to alter the boost on the turbo. Again it does this by fooling the turbo into producing more boost, but at least it's better than pumping more fuel in and having the turbo not know anything about it. They still don't detect RPM or injection timing and other parameters AFAIK, so it's still not doing what it is doing as efficiently as possible. Certainly not a good idea on a car fitted with a DPF. They also fool the fuel computer into thinking that you're getting more mpg (5 or 6 more mpg quite often), and this also obviously affects other areas of the computers read-outs.

  6. #6
    Full Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

    Default

    Looks like a remap is the way to go then. At least then I can disable the EGR to prevent the manifold from getting clagged up again.

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