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How much power can a stock F20A engine and H4A (MPXA) transmission reliably handle?

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    #1

    How much power can a stock F20A engine and H4A (MPXA) transmission reliably handle?

    Just curious, because in the far future, I might open up the inlet and exhaust line and maybe replace the ECU with a programmable one. The plan is to install an open filter as low as possible to get cooler air, a cheap exhaust manifold and replace the exhaust.

    So the question is, what's to gain, and will the engine and transmission still be reliable afterwards?
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    #2
    I'm not too familiar with the F20A, but I'm sure it can handle standard bolt-ons with no problem. Same goes for the transmission.

    As far as how much gain you'll see? A few horses typically. You may notice a bit more pep.

    YouTube Clicky!!

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      #3
      I wouldn't start worrying about the engine's strength until about 300hp, maybe a little more. I'm sort of talking out of my ass, because I don't personally know their limits, but based on how many people have done modest turbo kits on stock-internal F22s throughout the years and had good enough luck with them holding up, you should be fine around there.

      The automatic transmission, on the other hand, is a different story. They're known to be weak. I myself had two burn through clutch packs. One was an Accord trans that went out while the F22A was still in, and the second was a Prelude MP1A auto that was at first mated to the F22A and then also to the H22 when I did that swap; it was replaced with another Accord trans that then performed fine until I got rid of the car. But then both of the ones that got to slipping were high mileage and I was a bit rough on them (don't manually shift an auto that isn't designed for it ).

      I can't imagine any engine/transmission in a production vehicle giving out because of simple intake and exhaust bolt-ons. From the seat of your pants, you aren't likely to feel much of a difference yourself without an accompanying ECU tune.

      Accord Aero-R

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        #4
        This is pretty much exactly what I was thinking. I'm worried more about the transmission than I am about the engine. I just figured I'd ask about the engine too, while I'm at it.

        Anyway, thanks for your input!

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