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Thread: Afm

  1. #1
    Member fat bastard's Avatar
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    Default Afm

    Has anyone ever used a bigger afm on their 205 etc from another make of car? Didn't a great number of manufactures use bosch fuel injection systems (incl Porsche). I just interested since most of the sites state that rather than getting bigger throttle bottle body, injectors etc, the main restriction is the flow on the afm. Is this right? (Peter T)

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  2. #2
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    I think you're going to find your time is better spent converting to a MAP based injection system.

  3. #3
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    I am not a total guru on this, but you can go bigger and bigger with an AFM, but it still has the flap inside which restricts airlfow, where if you switch to a MAP or TPS there is no restriction and therefore better airflow, but going to all that trouble you may as well as go for quads, but the prob is the $, but I can see what you mean, if you have a bigger AFM, despite the flap, in theory there should be more flow.... if the plug on the 205 fits another AFM it should work, but I am not sure, let us know the outcome..
    05' Megane 225 Cup

  4. #4
    1000+ Posts PeterT's Avatar
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    If you want more power then the easiest and best route is to change ECU's, so the engine load is sensed via manifold pressure and/or throttle position. If you wish to retain the OEM look, you can remove the flap in the AFM and nobody will know the difference.

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  5. #5
    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by pugsy
    I am not a total guru on this, but you can go bigger and bigger with an AFM, but it still has the flap inside which restricts airlfow, where if you switch to a MAP or TPS there is no restriction and therefore better airflow, but going to all that trouble you may as well as go for quads, but the prob is the $, but I can see what you mean, if you have a bigger AFM, despite the flap, in theory there should be more flow.... if the plug on the 205 fits another AFM it should work, but I am not sure, let us know the outcome..
    Your forgetting the biggest issue, the AFM is simply just an Air flow meter that you can plug on if the hose connections fit.

    It's a highly calibrated peice of electronics that has it's carbon track/spring lazer cut and matched for your specific engine. You can't just put a bigger AFM on and expect it not to seriously impact your fueling (ie: make the car run like sh!t). You need to get another AFM that has that is calibrated identically to the original AFM on your car.

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  6. #6
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    Quote Originally Posted by DoubleChevron
    Your forgetting the biggest issue, the AFM is simply just an Air flow meter that you can plug on if the hose connections fit.

    It's a highly calibrated peice of electronics that has it's carbon track/spring lazer cut and matched for your specific engine. You can't just put a bigger AFM on and expect it not to seriously impact your fueling (ie: make the car run like sh!t). You need to get another AFM that has that is calibrated identically to the original AFM on your car.

    seeya,
    Shane L.
    Thnaks Shane, that makes sense
    05' Megane 225 Cup

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