*How to setup idle for AEM ECU*
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Jun 1, 2011, 07:58 PM
#21
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This is brilliant. Thanks so much for this write up. I used it to tune the idle on my 91 Supra with 750 cc injectors and GT35R turbo. My idle is rock solid now. I've been fighting stalling issues and messing with the idle settings on the AEM EMS for two summers now. I spent 45 minutes working with your instructions and it totally fixed all my problems. Thanks again.
Last edited by darklogic85; Jun 1, 2011 at 08:07 PM.
Jun 23, 2011, 04:05 PM
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NOTE: The ignition offset values in my original post have ben corrected. Thanks Masternater!
Gordian, Make sure you have the tps sensor setup as i described in the first post.
If the engine wants to stall when the compressor comes on raise the "ac clamp load" % until when the compressor comes on, the rpm does no drop below your target idle rpm.
Last edited by browningderek; Jun 23, 2011 at 04:10 PM.
Jun 25, 2011, 08:10 PM
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Ignition offset curve helps, but fine tuning the duty feedback table makes a huge difference. Set the target idle at 500 rpms and watch the idle feedback correction %. Add or subtract that % to your idle base duty table at that particular rpm point. Increase the target idle rpm by 100 and retest. Continue until around 2,000 rpms. This will make feedback about perfect.
Jun 26, 2011, 02:53 PM
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^^^ Correct! It is actually best to have a idle feedback # in the negative, meaning the ecu is taking away IAC duty cycle. This encourages a higher idle when the throttle is released to help prevent stalling. Works very well with big cams and a low idle where stalling seems to be the biggest problem.
