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What are the limits of the A9L

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  • #1

    What are the limits of the A9L

    I've run lots of HCI combos in the past (on 302's) that never got a tune. They ran perfect, but I'm sure I might've been able to squeeze a few more ponies out with a custom tune.

    I've put together an EFI system (mustang harness & A9L) for use on an HCI 351, and I fully expect it to run great.

    What is too big for the stock computer, what are the limits? I'm sure it has more to do with cam than cubic inch, but is there a rule of thumb?

    Can an HCI 393/408, with a small cam (less than .550 lift) run OK w/ the right injectors, and no tune?
    Last edited by barronj; 06-11-2012, 09:37 AM.
    Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

    Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."
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  • #2
    With a custom tune it's more of an airflow limitation based on injector size / MAF size.

    Even then there are a few things you do to trick the computer but then you start getting certain side effects that can be annoying.

    I would say around 8-900whp and 80lb Injectors. Of course this is my opinion and you can go further than that, but it takes jumping through certain hoops.

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    • #3
      Originally posted by Prime-Tuning.com View Post
      With a custom tune it's more of an airflow limitation based on injector size / MAF size.

      Even then there are a few things you do to trick the computer but then you start getting certain side effects that can be annoying.

      I would say around 8-900whp and 80lb Injectors. Of course this is my opinion and you can go further than that, but it takes jumping through certain hoops.
      What are the limits without a tune, in your opinion/experience?
      Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

      Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."

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      • #4
        It depends on what the combo is and what type of bad driveablity problems you can learn to live with.

        If you get lucky with a good MAF that is calibrated to your injectors. You can make it to 4-500hp

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        • #5
          about 9,500 rpm.

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          • #6
            Originally posted by Prime-Tuning.com View Post
            You can make it to 4-500hp
            Just toss a wideband on it and see if you need a tune.
            "When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
            "A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser Tytler

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            • #7
              Thanks. I know it's kind of a vague question. I appreciate the input, even the humor.
              Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

              Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."

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              • #8
                the processor speed at rpm is the real issue keep the revs low and the processor will work just fine. Any real driveability problems are issues with the tune.

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                • #9
                  I've heard its not only the rpms but the rate at which the engine accelerates as well. Basically the ECU can't keep up if the engine accelerates at too fast of a rate and you have issues.

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                  • #10
                    I have never had an issue as such. only problem i have ever seen at rpm, is the memory speed favors the processor and the data gets choppy, because the processor is using the bulk sum of the memory bank to run the motor, and less memory is left for data acquisition. I have never had one break up at any rpm, because the processor couldn't keep up. Only data break up during logging because the processor makes use of most of the memory at wot.

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