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Thread: Pro-Jection 502-20S misinformation (MAP sensor)?

  1. #1
    skimask Guest

    Default Pro-Jection 502-20S misinformation (MAP sensor)?

    Looking at the Summit Racing web site...and there's others out there with the same information:
    http://www.summitracing.com/parts/HLY-502-20S/

    Site states in the description for the 502-20S model TBI units that it includes a MAP sensor.
    Where is said MAP sensor? I don't see it in the pictures, I don't see it referenced in the online installation manual (PDF).
    Are those sites all wrong? Is the Holley documentation wrong? Am I wrong? JDG

  2. #2
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    The 502-20S does not utilize a MAP sensor. Not sure where Summit got the info from or if it was just an assumption.

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  3. #3
    skimask Guest

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    Quote Originally Posted by Jay M View Post
    The 502-20S does not utilize a MAP sensor. Not sure where Summit got the info from or if it was just an assumption.
    So, the 502-20S is a speed-throttle (Alpha-N?) system vs. a Speed-Density system?
    And as far as Summit's information, from the looks of it, a bunch of other 'speed shop' websites have the same information...all of it bad.
    The 502-20S is out for me... Can I assume that the Commander does actually use a MAP sensor in it's calculations?

  4. #4
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    Yes, the Commander 950 is a true Speed-Density EFI system (MAP sensor included) and I highly recommend it over the 502-20S Alpha-N system.
    However, if you're not a proficient EFI tuner and you're looking for a self-tuning system (no laptop required), I suggest the new Holley Avenger EFI.
    http://www.holley.com/division/Holleyefi.asp#95
    http://www.holley.com/HolleyEFICatalog/
    Last edited by Danny Cabral; 04-25-2010 at 06:57 AM.
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