Thread: aem ems using o2 feedback in boost

remember you can adjust for open and closed loop. set min and max in o2 feedback control. This way you can keep the cruise and part throttles in closed loop.

yeah, i really want to set up my o2 feedback i guess till boost onset then have it cut and run off the fuel map, or adjust for the boost comp settings

question, i just set up my o2 feedback from o-.93psi and i was configuring my wideband and noticed that the feedback on te laptop screen since my wideband is setup for the ecu to read the data obviously it was reading correctly 14.7 at idle however my wideband gauge was reading off it was like 13.5 to low 13s.

my question is, its a plx wideband and was wondering if the gauge can be off frm the o2 sensor sense on the laptop the wideband was reading 14.7 as its supposed to. however the gauge wasnt so how can i fix this

try this first. go to configure>units>afr units
click on ethanol hit apply then click gasoline then apply. this corrects the value some times. seems like a bug in the software I had to do this on many occasion. if it does not work I have another fix

I would put this to 1 or 1.5 psi. just cruising can cause the car to keep switching back and forth between open and closed loop

is there a definite need for open loop like say you did use the o2 feedback then in theory wouldnt it always be in closed loop running off the o2 feedback map?

also the AEM is reading correctly, when i drive the car it tries to use the o2 feedback as a guide ad the o2 sensor does read correctly on my laptop screen and in the aem software, however the gauge tends to read richer, would the software effect the gauge read out?

what you see on the laptop is what the aem sees if your reading it threw the AEM software.

true but i wonder why my gauge says a different reading?

what do you feel about the current o2feedback specs they are of stock configuration as i havent changed anything as of yet or what do you suggest?

o2 fb accel max 50 usec
o2 fb accel inhabit 984 ms
o2 fb decel inhabit 1509 ms
o2 fb update rate 58.79 msec

o2 fb coolant min 122 f
o2 fb maximum load 3.86 psig
o2 fb maximum rpm 7500rpm
o2 fb rich limit 19.92%
o2 fv lean limit -19.92%

what are some changes you suggest making to these configurations? i configured my wideband sensor to 1.30 to get the sensor to read 4v thats what aem said to do.

how do you feel about the o2 feedback not going out of closed loop and readng in WOT situations? like converting the whole o2 map to read 100% boos and not just driving coniditoins ect

There is a difference in voltage between the signal to the ECU and your gauge. This happens all the time. AEM has the procedure in their PDF manual for how to correct for this (the setting is not included in the list you posted). You will edit a value which will cause AEM to read the same as the gauge or vice versa, It is up to you to find out which reading is correct and calibrate the wideband sensor. That should be in the PLX documentation.