Anyone datalogging with OBDFusion and an OBD2 dongle? It is really easy to set up and relatively cheap. I started doing this a few months ago and have gathered a lot of interesting information.

 

Follow up, anyone tracking their KCLV?

 

^^^^Yes, I've tracked KCLV for a few years now. First on my ISF and now on my LC. With the crap gas we have in Arizona I was never able to get over 20 in my LC. Usually in the high 18s or low 19s. I have used Lucas Octane Booster for the last three years and my KCLV now reads between 21 and 23.

Lou

 

do you track your knock feedback value as well? I have read that this value is the one used to control the increase/decrease of the KCLV

 

^^^^That always is at 3.

Lou

 

I believe it changes from -3 under heavy load. In my datalogs when I floor it this value fluctuates quite a lot.

 

What are you logging and what interesting info have you found?

Only downfall I've found with the OBD2 dongle logging is the speed/refresh rate. If you're logging too many different things, you can lose some granularity in the log. Okay for checking trends, but for something like tune updates you'll want to use TechStream or a cabled option.

I have a Tactrix cable that does have the ability to auto log to SD based on certain triggers (like WOT), but I could never find a Lexus log file example to test with. That would be ideal to get the high data rate without needing a laptop in the car.

 

I haven’t had any issues with logging 15 or so PIDs. It all seems to update on each PID frame. I suspect the issue you are having is to do with your specific dongle.

I have been logging knock feedback and KCLV, and noticed trends and particular RPM ranges where I have knock feedback. I also noticed my bank 1 fuel trims are always around 5% more positive than my bank 2 fuel trims.

 

In the dry season when I can drive more spirited, I mix the 91-octane with 25% of E85. It increases the KLCV to over 24 or even 25. The car responses similar to having the Apex'i throttle controller on. The trick for getting the KLCV up quickly in the first few miles is to drive hard uphill on 8th gear with the gas pedal on the floor. You can see the number on the OBD Fusion climbs right up. I always watch the LTFT to make sure that it stays below +25%. I notice that the bank-2 is always higher than bank-1 by a few percent.

 

interesting. Are you paying attention to the knock feedback value as well? This is the value the ECU uses to adjust KCLV. When it’s hot outside and I make a full throttle pull it fluctuates A LOT. It seems like more negative lowers KCLV and values closer to 0 increase it. -3 is baseline.