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  1. #1
    andreaaa72 Guest

    Default Increased injector for My Q4

    Good afternoon
    first of all sorry for my english but I don't speak english very well. This is my first post to this forum.
    I'm working to modify my Q4 and I have changed the original Garrett with an ibrid turbo T3/T4. Now I need of injector with greater capacity. I want to install the Bosch injector (I can buy them at the good price) but I cannot find an injector compatible that greater capacity has one. Can you advise to me the ref. number please?

    Thanks in advance to everyone.

    Andrea

  2. #2
    andreaaa72 Guest

    Default

    UPP
    Anyone can help me?

  3. #3
    Juan AR155Q4 Guest

    Default

    Hi!
    You should check first that actual injentors are small for the output power. You should be able to measure duty cycle of them. (80%-85% maximum).
    One thing you could do is raise fuel pressure, it´s an easy thing to do.
    If none of these thing gives you enough fuel, then I´d go for bigger injectors.
    Originals are 348cc/min (I think, somebody correct me). Some guys in here are using Siemens Deka 650cc/min, but the have bigger modifications, not just a turbo upgrade.

    Hope this helps.

  4. #4
    cuore_sportivo_155 Guest

    Default

    is there a link or a catalog where injector capacities can be checked? I don't have a Q4 but my twinny is being upgraded and will produce quite a bit of HP so might need bigger injectors also

    Obviously I'll be using a powerboost valve first.

    How can the duty cycle be measured? Through the diagnostics?

  5. #5
    andreaaa72 Guest

    Default

    Thanks Juan
    but I have modified induction manifold and the leads of aspiration in the gasket, I have installed the new pistons and connecting rods H, I have replaced the catalysts (200cps) and a lot other soon. And so I want install the new big injector because I think that the old one is not sufficient for this elaboration.

  6. #6
    andreaaa72 Guest

    Default

    Thanks Juan
    but I have modified induction manifold and the leads of aspiration in the gasket, I have installed the new pistons and connecting rods H, I have replaced the catalysts (200cps) and a lot other soon. And so I want install the new big injector because I think that the old one is not sufficient for this elaboration.

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