Tweecer + FMU question.

Discussion in '94-95 5.0 Tuning' started by eschlenz, Jun 20, 2006.

  1. eschlenz Founding Member

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    Last summer I upgraded my fuel pump to a 255LPH. I immediately noticed a drop in performance suggesting a rich condition. Hooking up some narrowband a/f gauges only convinced me further especially at WOT (I know I need to get a WB O2).

    In my quest to tune this puppy, I've just purchased a spacer kit to change the FMU ratio. I've also purchased the Tweecer RT. I'm going to start by moving my FMU ratio down from 10:1 to 8:1. From that point forward I will be looking to the Tweecer to help me out.

    I know I need to ditch the FMU and go with the injectors and MAF. But for now it stays ($$$).

    Question 1: Pushing closer to 5 or 6 PSI (I'm at altitude), can I just ditch the FMU completely with my stock injectors (24#) and MAF? Or is that too much for the setup to handle.

    Question 2: I've heard the Tweecer and FMU combo can be a pain. Has anyone had success with this combo?
    eschlenz, Jun 20, 2006
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  2. eschlenz Founding Member

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    Why did this get moved to FOX tuning when it's an SN95?? Whatever. TTT
    eschlenz, Jun 21, 2006
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  3. vristang Advanced Member

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    I did not realize what ecu you were running.

    If you contact the moderator Daggar, I am sure he will move the thread for you.
    He's cool like that.:nice:

    jason

    Edit: looks like that was done already???
    vristang, Jun 21, 2006
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  4. Daggar New Member

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    My bad. I saw it was a TwEECer question and filed it into the 5oh tuning section with the rest of the ECU related threads.
    Daggar, Jun 22, 2006
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  5. final5-0 Mustang Master

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    I would be thinking you are going to tread in dangerous territory if you try and ditch the fmu with only 24's.

    I feel compelled to suggest the first thing you do is get a wb so you know where you now are with your fuel ratio.

    I know that blower does not move as much air as some others but

    Like you already said ... you got the Tweecer so I would get a set of 42's and a matching caled maf ... not C&L.

    Then you can safely tune it without the fmu which btw, doesn't always give the same rate of fuel.

    Its the fmu and not so much the Tweecer that is the challenge you speak of although from time to time ... Tweecer tuning can make you :scratch: ... :rlaugh:

    Grady
    final5-0, Jun 22, 2006
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  6. 87GTSnake New Member

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    Make sure that if you use the tweecer to change the injector size in the computer that the MAF you have is calibrated for 19#.

    For example, if you have a c&l meter calibrated for 24# injectors and then use the tweecer to change the injector size in the ECU you will have a big problem, or atleat this is what i've been told.
    87GTSnake, Jun 22, 2006
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