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.
    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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  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.
    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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  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."
    Top Swapped 01 Imp
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  8. #7 Re: Help with relay wiring 
    Donating Users bandook's Avatar
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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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