WOT Box + AEM AFR Failsafe Compatibility Issue

Discussion in 'Mazdaspeed 3/6 ECU Tuning' started by BuddySpeed3, Nov 2, 2018.

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  1. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    Hey everyone, I've just recently installed the SP63 6th port aux fuel injection kit into the car. Started tuning and so far so good with no fuel leaks, good low side fuel pressure, and nice cool bat's (mixing 2 gallons of in tank meth).

    I decided to install a fuel pressure gauge, oil pressure gauge, and most notably an AEM AFR failsafe gauge. I've also installed an N2MB WOT box to prevent a lean burn during Flat Foot Shifts, and when hitting the rev limiter.

    Since the aux fuel system will keep spraying during these two occurences, a dangerous lean burn is possible since the oem rev limiter and FFS feature will cut the stock injectors, and not ignition like the WOT Box does. (Thanks Nishan)

    The problem I'm having is that the AEM AFR failsafe is triggering my Guardian angel during a WOT box FFS. I noticed in my logs that there is usually one cell that displays lean to about 29:1 during a FFS, but I'm assuming this is because the oxygen is detected by the wideband sensors, since it's not being used in combustion when the WOT box cuts the ignition.

    Since I have my WOT box ignition cut set to 250 ms, I tried setting the AEM failsafe trigger delay to 300 ms, but the Guardian Angel still gets triggered by the AEM failsafe during a FFS, and causes boost not to return into the next gear.

    Is it possible that I need to set the delay on the AEM failsafe even longer?

    Thanks!
     
  2. Ssinstaller

    Ssinstaller Greenie Member

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    I'd double the delay.

    IMO the wideband failsafe isn't really necessary during FFS. All you need is a standard relay to disable the aux fueling anytime you press the clutch pedal.
     
    Last edited: Nov 8, 2018
    Ssinstaller, via a mobile device, Nov 8, 2018
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  3. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    Thanks I did just that. I increased the delay on the AEM failsafe from 300 ms to 400 ms, and it no longer triggers the Guardian Angel. I will slowly bring it lower and lower until I find the magic delay number. I'd rather have the shortest delay possible in case the aux fuel setup fails.

    I see what you mean with having a setup cut aux fuel when pressing the clutch and just using the FFS feature in ATR, but idk how I would go about doing that, and if it would be as reliable as just using the WOT box to cut ignition.
     
    BuddySpeed3, via a mobile device, Nov 9, 2018
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