Hondata

Hello, I recently updated my S2000 tune with full ethanol flex fuel capabilities in Flashpro. So far everything is working great, but I do have a small concern/question about random spikes that occur that will take my ethanol reading all the way to 100%.

Question 1: Does Flashpro have any sort of ...

Thanks for the reply. Couple of follow-ups.


I would not recommend trying to run closed loop at al times as any issue with the O2 sensor could have bad consequences.

I will use your precaution on this, but I still would like to know if there is a way to run closed loop when the car is in VTEC ...

Hi, I have a few questions that I've been wondering about for a quite a while, and I'd like to get more detail than what is provided in the help manuals. I will take whatever the most you're willing to give me.

Three different settings for secondary oxygen sensor. What do they all do specifically ...

Thank you

Nothing in the software has been changed that would affect the display of the AFR. I you would like I believe you can plug in a generic OBDII scanner and get the same AFR reading as FPM.


I'm referring to the data of the AF Corrected field which is a recalculation done by Hondata Flashpro ...

I have been successfully been tuning my S2000 with both the AFR Corrected and my AEM Wideband AFR gauge for some time now. They have always been almost exactly equal to each other, and very reliable.

I'm not exactly sure when, but sometime in the last year I noticed that the AFR Corrected readings ...

The problem is that the Honda ECU always looks for the SO2, even when unplugged or disabled. I can look to see if there is an alternate way to stop the ECU using the SO2, but it might take a little while. The error condition is what stops the ECU using the SO2, not what I originally thought but ...

What happens if the SO2 is disabled and plugged in?


I would have to go find the sensor (probably buried somewhere) and plug it in.

So I've retuned the low fuel map from scratch and the lines on the map are significantly smoother flowing now. I've managed to run around 0% LTFT and -2 to 2% STFT ...

Significant improvement (as seen in the attached picture and datalog) by simply enabling the secondary O2 sensor while keeping it unplugged.

It still goes pretty lean (~16.5AFR) for the first ~10 seconds after startup before the closed loop system kicks in, so if you have any advice on how I could ...

There's a couple of minor things and one major thing. The minor things - don't test with live tuning on if you suspect a problem. There's no known problems with live tuning on the S2000 and I have not seen any bugs with it, but it is one more factor when trying to diagnose something. The second ...

The trims are now changing which indicates that closed loop is working.


Please read my original post. It wasn't a matter of closed loop working or not working, it clearly does something when it is active but the issue is that it pulls WAY too much fuel at idle. My point is that the closed loop ...

Went ahead and did it any way. Please let me know what you think.

Try putting the stock fuel trim settings back and see if that works better.


I have tried with every possibility including the stock values. No matter what numbers I put in the fuel trim fields (except all 0's), it always does what you saw in the logs at idle.

If you want me to do this and post ...

Please note that I have a 2 month old AEM wideband sensor that is hooked up to the ELD pin on the ECU, as you can see in the calibration, if you wanted to view this data alongside the factory primary O2 in your own logging template.

Post the calibration as well as datalogs showing what you are describing.


Exact steps taken.

Loaded "FEB17-RandomRichness-ClosedLoopON.fpcal" and datalogged "Datalog-210217-ClosedLoopON1.fpdl":
1. Drove car around for a while to get fully warmed up.
2. Noticed that WOT pulls in 1st and 2nd ...