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03-19-2019 #1
GM ecu vs aftermarket and PWM control
I’m trying understand the wiring difference between GMPP (connect and cruise kit) or an aftermarket kit such as Holley (pwm capable sytem) to run a LS3 w/T56. My question is more related to function and wiring hook up, not about additional features or preferences. I would like PWM fan control for sure, and most likely PWM fuel pump. My goal is to keep wiring as simple and direct as possible. So am I understanding this correctly,
1. GMPP ecu offers no PWM control or signal but PWM can be adapted. I’ve read the entire massive thread on PWM going around here and on the other forum. Or a stand alone PWM controller such as the DCC units, but this takes the ecu fan control out of the loop and runs independently? Does it get temp from ecu or does it require another temp sender?
2. Aftermarket ecu w/PWM (ie Holley) will provide a signal, but will still need a PWM controller such as the C6 controller? This would be more or less and play?
3. How about A/C trinary switch, it gets wired in either way so no difference either way?
4. PWM fuel pump, not as concerned with it as much as I am about PWM fan, but would still like to use it. GMPP ecu then use vaporworx pwm fuel pump controller? Aftermarket ecu still need vaporworx controller, or what other options to hook it up?
I’m mostly asking about PWM in this post, but as an additional question comparing the different ecu’s, and instead of starting another thread,
5. GMPP uses 2 - O2 sensors and the Holley (Terminator X for example) only uses 1 - O2 sensors. What are the pros and cons if this, if any?
6. GMPP uses MAF and Holley uses MAP, correct? I know this can be complicated to answer quickly, but is there any major pros or cons either way? I’ve done a ton of research on this but it seems like it’s a 50/50 mix of opinions. I’m running the LS3 525/ASA cam, if that makes any difference.
I’ve been going back and forth for a while now if I’d like to stick with factory stuff or go aftermarket, so I’m really looking forward to your opinions. Thanks for the help.
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03-19-2019 #2