Page 1 of 3 123 LastLast
Results 1 to 10 of 25

Thread: Need info about WOT cutout relay

  1. #1
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default Need info about WOT cutout relay

    I'm starting a new project. I'm building an active exhaust, and I'm using fast actuating electric exhaust cutouts (that I have to first build), but I want to be able to have them open based on percent load. Since I've been tuning with a Moates Quarterhorse, I've found I have control over things I otherwise wouldn't and it occurred to me that I can adjust the load at which the EEC opens the WOT cutout relay for the AC compressor. What I need to know is: Can anyone tell me if the EEC commands the relay open when the AC isn't actually on? I don't know if the EEC has to first see signal on the ACCS (pin 10, pk/lb) circuit to enable WAC (wot cutout pin 54, o/lb), or if it will command the relay even when it doesn't see V on ACCS. Anybody have any idea?
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  2. #2
    Join Date
    Oct 2004
    Location
    Southern Maryland
    Posts
    2,639
    Feedback Score
    0

    Default

    Put your meter on the pin 54 circuit. With the key on you will have 12v. When the EEC picks the WOT AC cutout relay you will have ground.

  3. #3
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default

    I know that, but I'm a ways out from being to the point where it maters, and I was hoping someone could save me the trouble. I'm not really positioned well for practical testing of the control circuit at the moment.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  4. #4
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,228
    Feedback Score
    0

    Default

    Quote Originally Posted by TheFoeYouKnow View Post
    I know that, but I'm a ways out from being to the point where it maters, and I was hoping someone could save me the trouble. I'm not really positioned well for practical testing of the control circuit at the moment.
    The PCM provides ground to energize the cut out relay and opens ground at around 75% throttle... AFAIK this function operates regardless of whether A/C is in use or not... There is a 12v feed to the ECM just after the low pressure switch and before relay that's used to determine idle speed when A/C is activated...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  5. #5
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default

    So you're saying wot cutout is a n.o. relay not a n.c. relay?
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  6. #6
    Join Date
    Oct 2004
    Location
    Southern Maryland
    Posts
    2,639
    Feedback Score
    0

    Default

    Is it n/o or n/c ? Good question, I assumed it was n/c.
    Looking at the EVTMs, 83-no relay, 84-85 shown as n/o, 86-88 shown as n/c.

  7. #7
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default

    EVTM seems to suggest n/c. I tested one of my cutouts last night and the results were encouraging, I need to figure out how to adjust the zero position of the valve now. Then, I need to find a good material to make mounting flanges from and a high temp gasket material that can also act as an insulator between the steel flange and the cast aluminum of the valve. Verifying the WAC circuit is about 10 steps down the list. If WAC isn't a viable control method, I'll use a WOT switch from a nitrous system. Problem is, if I do that it's no longer EEC controlled, and I can't tell people I have an active exhaust.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  8. #8
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default

    I priced out commercially available electric exhaust cutouts at about $450 a pair, and my research says they take 2 to 3 seconds to fully open. That's not fast enough. By the time they get open, it's almost time to close them again. what I'm working on should be able to fully open in 180ms to 220ms.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  9. #9
    Join Date
    Feb 2012
    Location
    Grand Rapids, MI
    Posts
    1,829
    Feedback Score
    7 (100%)

    Default

    Going to try to get flanges made soon. My T-Bird is still in storage for the winter, but once I pull it out, I'll get to testing the viability of WOT cutout for valve control. I've got my valves zero'd out, and I have a sub-harness mocked up. Just thought I'd update.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  10. #10
    Join Date
    Nov 2005
    Location
    Louisville, KY
    Posts
    365
    Feedback Score
    3 (100%)

    Default

    I've heard of vacuum operated cut outs, but never WOT controlled by EEC. I'm taking notes.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •