Results 1 to 4 of 4

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:

    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
    Join Date
    Nov 2009


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

    1972 Rally Nova
    1972 C-10 Short Step
    1970 Rally Sport Camaro
    1986 Chevy Silverado K10
    2009 F150 Lariat

  3. #3
    skimask Guest


    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
    Join Date
    Dec 2009


    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.
    Last edited by Danny Cabral; 04-25-2010 at 06:57 AM.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us