I am having an issue where it doesn't seem that my AFR is following the open loop tuned boost tables. I've included a datalog to show. I am still very green when it comes to tuning but am learning as I go. The car was tuned by a reputable local shop and I have only changed small things such as the launch control, wideband voltage offset etc. I am hoping someone will notice why this may be happening.
84mm B18c
1000cc ID injectors
PLX wideband into ELD D10
P28 ecu
version 2.3.7.0
AFR not following tuned tables
AFR not following tuned tables
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Last edited by DA9's on Sat May 09, 2015 5:22 pm, edited 1 time in total.
Re: AFR not following tuned tables
Can someone please inform me how to post a datalog/calibration file?
Figured out how to attach a datalog/calibration and posted above. Any help would be appreciated.
Figured out how to attach a datalog/calibration and posted above. Any help would be appreciated.
Re: AFR not following tuned tables
So I was thinking about this today and if I am correct, when running in open loop the AFR is solely determined by the set fuel tables. Only in closed loop does the ecu target a specific AFR and adjusts accordingly based on the input from the desired O2 sensor.
If all of the above is true, I have no idea what is going on. I haven't changed the tune but it seems to be lean under boost. Looks to me like I need to add fuel. I will do another datalog just to be sure the SManager and my wideband are tracking together properly.
I posted here hoping someone might notice something in the calibration the was "checked" or "unchecked " that might have an effect.
If all of the above is true, I have no idea what is going on. I haven't changed the tune but it seems to be lean under boost. Looks to me like I need to add fuel. I will do another datalog just to be sure the SManager and my wideband are tracking together properly.
I posted here hoping someone might notice something in the calibration the was "checked" or "unchecked " that might have an effect.
Re: AFR not following tuned tables
Your lambda reading does not look correct. For instance, at 7:03 when you are off the throttle and the injectors have shut down, then AF should be infinite, but rather it shows 14.77:1
A wideband offset of -0.35 volts indicates a wideband ground problem, but it seems that the problem is something more than that.
The battery voltage is dropping to 12.5 volts at times, like the alternator is not working. When the car stalls the voltages drops below 10V.
A wideband offset of -0.35 volts indicates a wideband ground problem, but it seems that the problem is something more than that.
The battery voltage is dropping to 12.5 volts at times, like the alternator is not working. When the car stalls the voltages drops below 10V.
Hondata
Re: AFR not following tuned tables
Thanks for the response. The wideband is grounded at the ecu but will move it to the the thermo housing and try that. That makes sense as to why the lambda would be off that far under boost.Hondata wrote:Your lambda reading does not look correct. For instance, at 7:03 when you are off the throttle and the injectors have shut down, then AF should be infinite, but rather it shows 14.77:1
A wideband offset of -0.35 volts indicates a wideband ground problem, but it seems that the problem is something more than that.
The battery voltage is dropping to 12.5 volts at times, like the alternator is not working. When the car stalls the voltages drops below 10V.
I didn't realize the voltage was dropping down below 10v. It is a fresh alternator and battery so that is strange. All is ran through a cutoff solenoid and maybe it is clicking on/off quickly when the car stalls and shows a significant voltage drop. That is def going to wreak havoc on my tune if I don't get that sorted.
I'm pretty new to datalogging and messing with the SManager so these novice things elude me fairly easily. Thanks again for the reply and giving me a lead or two. Cheers.