Thread: Help with relay wiring

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  1. #1 Help with relay wiring 
    Donating Users bandook's Avatar
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    Does this look ok? So what my idea is, is to use a relay to pull timing in the event that my AEM meth injection fails. The controller has a green wire that is grounded when an error occurs. My plan is wire that to a relay that will open one of the IAT connections, either the ground or the 5v source. I'm not sure if it matters which one I use?


    cayman s turbo 0 60

    When the IAT is disconnected it reads -40°. So then it's just a matter of pulling maybe 5 or 10 degrees of timing.

    Never really messed with custom relay so I'm asking y'all. Thanks
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    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  2. #2 Re: Help with relay wiring 
    Killa Bee Scottydoggs's Avatar
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    i just watch the wb, if im not in the 11's i let off. my meth led light is in the middle of my pod where my wb is. and im using a red led light, not the green one they have in the kit. its really bright.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Help with relay wiring 
    Donating Users bandook's Avatar
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    Cool story bro, but I have a wife who sometimes drives my car and barely knows what a cel looks like, nevermind an LED for meth failure, lol.

    I think it's better to open the ground instead of the 5v. Less chance of voltage spike hurting the pcm. I think, but can't confirm, the relay I have is diode protected too. It's just one of our fuel pump relays.
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    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  4. #4 Re: Help with relay wiring 
    GXP Level Member GTPpower's Avatar
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    Looks like that would work to me. Good idea.
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  6. #5 Re: Help with relay wiring 
    Donating Users bandook's Avatar
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    Sounded like a good idea, eh? Can't get it to work yet. So the green wire from the controller sends battery voltage. But I can't get it to activate the relay for some reason. As soon as I hook it to the relay, the 12v disappears. Works just fine with 12v direct from battery. So I'm obviously not understanding how that failsafe wire works.
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  7. #6 Re: Help with relay wiring 
    Donating Users bandook's Avatar
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    I think I need to apply 12v to pin 86, instead of ground. The instructions say :
    "The green wire on the controller is the 1.7 amp switched ground. This wire can be hook up to a solenoid that will vent wastegate pressure when activated. Apply 12 volts to the other side of the solenoid. this output can also be used to trigger a timing retard function in a standalone ECU or a CDI whenever the system runs out of fluid, thus protecting your engine. It is highly recommended of this feature be utilized."
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  8. #7 Re: Help with relay wiring 
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    Got it.

    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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