Results 1 to 6 of 6

Thread: Relay for fuel injector & coil driver power?

  1. #1

    Default Relay for fuel injector & coil driver power?

    I have a question about the EST 12V (B20 Pin). I'm using it to power a GS100102 Hall-Effect sensor after reading one of Danny's threads. I cannot seem to find that thread right now. Based on that thread, I understand that using 12V is much better than 5V for this sensor. Before I changed to the GS100102 for my crank sensor, I was planning on using EST12V to turn on relays for the fuel injector & coil driver (P/N 554-112) power. The reason I'm including relays for these two circuits is the OEM wiring harness I'm adapting to the Holley ECU has the relays. Would it be unwise to use EST12V to power the relays AND the crank sensor?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,804

    Default

    Quote Originally Posted by Jeep4.7 View Post
    Would it be unwise to use EST12V to power the relays AND the crank sensor?
    Yes, it's not intended to power anything that draws amperage. Use the green fuel pump wire to power
    the fuel injectors & ignition coils/coil driver, as it does anyway. See Holley Wiring Manual schematics.
    It has a 20 amp fuse and it also feeds power to the fuel injectors (& ignition coils - LSx, MOD & HEMI).
    Simply use the green fuel pump wire (+12V) to trigger your additional relay's coil (+) at terminal #86.
    http://forums.holley.com/showthread....9623#post69623 (System Relay & Injector Wiring Troubleshooting)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  3. #3

    Default

    Use the green fuel pump wire to power the fuel injectors & ignition coils/coil driver, as it does anyway.
    I completely missed that terminal 86 was also routed to the fuel injectors. Doh! New plan is to use Fuel Pump Out (A2) to turn on my fuel pump relay, injector relay, and coil driver relay. Any issue with driving three relays from one ECU pin?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,804

    Default

    Quote Originally Posted by Jeep4.7 View Post
    Any issue with driving three relays from one ECU pin?
    No, that's fine. As long as it's only energizing the coil of each relay (not the load terminals).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  5. #5

    Default

    Quote Originally Posted by Danny Cabral View Post
    No, that's fine. As long as it's only energizing the coil of each relay (not the load terminals).
    Thanks.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,804

    Default

    You're welcome.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 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