Hondata

I'm starting to troubleshoot at knock retard that occurs on cylinder 1, which often occurs near a VTEC on-to-off transition. It does not always occur so that makes me think it might be something rattling around. Perhaps, valve lash? I remember my RSX had surprisingly tight exhaust valve lash.
Any ...

Interesting points and I too wondered if ecu logic is a factor, as much as hardware limitation and temps will be the obvious ones.

Here's a run which shows the AFM.v (blue) hitting 5V limit just before 17:27, which led to a big step up in AFM g/s (red). It stayed at 5V limit, but the g/s is not ...

This is all speculation because I did not work for Honda. In automobiles, analog sensors have diagnostic levels. With a 5V sensor like the MAF, generally the diagnostic levels are < 0.5V and > 4.5V. This is part of the safety system design (ISO-26262). If the sensor measurement wire (analog voltage ...

There’s a lot of slip in that log. The traction control retarded ignition as much as 25 degrees.

Perhaps, I can help by bringing you through the process I used to look at your log. At around 10:00 in the datalog I noticed something interesting. I've marked the points of interest 1, 2, 3.
1 - Decrease in AFM ~2% while throttle plate is 99% open
2 - Increase of AFM ~2.5% while throttle plate is ...

Thank you for the clarification on the FlashPro support of ELM327 protocol. Consequently, that's what I was logging ambient temperature with was a $30 OBD2 ELM adapter. I found a datalog that serves as a good example of how ambient temperature sheds light on what's going on.

Air_Temperatures.png ...

Interesting. Am I correct in assuming the FlashPro does not log via PID? Since the FlashPro uses the ELM327 protocol, would I be able to log ambient temperature (PID 0x40) via the app I was already using?

It might seem crazy to request this but I was previously logging ambient temperature before I was using Hondata. Consequently, my drive to work can have huge temperature variations. To give you an idea, a small rock chip on the windshield turned into a huge crack in the windshield because of the ...

Removing power, updating the firmware and calibration has seemed to resolve the issue. I am willing to caulk it up to a soft-error if Hondata is. For the audience, a soft-error is not a firmware/software bug.

Unfortunately, the data-logging failed to stop once again. I went to the store and hit the datalog button. When I got back, I pulled the FlashPro from the car and there was only one datalog. I kind of marked where I shut off my car in the picture below.
datalog_no_stop.png
I noticed a revision of ...

I've been leaving my FlashPro attached to the car and have logged while taking few drives. I wasn't driving hard so I haven't been pulling the logs after every drive. The other day, I went for a drive and pressed the datalog button and the LEDs seemed to indicate is was not logging so I decided to ...

Thank you for your reply.

It's probably better to look at why your vehicle was retarding the ignition.
I couldn't agree with you more. Consequently, I am using the 93 octane calibration fine now with no knock retard (with winter gasoline) because I understand why.

I'm sorry, I should have been ...

I'm a little disappointed that Hondata didn't reply. I was hoping we could open up a discussion to benefit the community.
Unfortunately, I got impatient and figured it out why different 93 octane gasoline has different knock retard. With winter gasoline, I no longer have knock retard and I did not ...

I had originally used the "93 octane, intercooler" base map but I was getting 4 degrees of knock retard on all cylinders on my first pull. Since I know the gas can be tricky in New England, I switched to "91 octane, intercooler" and have seen very little knock retard.

2017 Civic Type R
Mods ...