AEM failsafe, how to use failsafe feature best?
I recently bought a AEM failsafe gauge that reads wideband O2, boost, rpm and can datalog. The gauge also has the ability to ground a wire when the gauge detects a lean or overboost condition.
I'm wondering what is the best way to use the failsafe feature? Thoughts have been: 1: Install a normally closed relay inline with the injector power, so technically this would be a fuel cut when the unit detects trouble. 2: Install a normally closed relay that would cut the signal to the leading coil, or power to both coils? Engine would still be receiving fuel which when ignition returns I can imagine might be very bad... But doing just the leading coil, wouldn't that just retard the timing a lot and kill power? 3: I could tie into the ECU for a boost control solenoid, not sure how I would do this or if it's a good idea. Or if any of this is a good idea... I've read other guys cutting power to the ECU all together, that doesn't seem smart either. Engine is a 13B-REW |
Originally Posted by Jacobs_RX7
(Post 11647097)
I recently bought a AEM failsafe gauge that reads wideband O2, boost, rpm and can datalog. The gauge also has the ability to ground a wire when the gauge detects a lean or overboost condition.
I'm wondering what is the best way to use the failsafe feature? Thoughts have been: 1: Install a normally closed relay inline with the injector power, so technically this would be a fuel cut when the unit detects trouble. 2: Install a normally closed relay that would cut the signal to the leading coil, or power to both coils? Engine would still be receiving fuel which when ignition returns I can imagine might be very bad... But doing just the leading coil, wouldn't that just retard the timing a lot and kill power? 3: I could tie into the ECU for a boost control solenoid, not sure how I would do this or if it's a good idea. Or if any of this is a good idea... I've read other guys cutting power to the ECU all together, that doesn't seem smart either. Engine is a 13B-REW What EMS are you running, you can probably also get it to work with an input on the EMS to have it cut boost or add fuel trim etc. |
Thanks for the input, I'm running a power FC. Do you know if there is a way to make it pull timing or add fuel?
I don't have a boost controller setup right now but I was worried about a spike as well; or a stuck wastegate or boost creep etc that may not be controllable. Sounds like the fuel cut to injectors may be a bad idea as well. Maybe add a solenoid to pop the wastegate off the vacuum chamber? I don't know if that's smart either if it causes the turbo to overspeed/spool. |
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