i have a 2011 DL and Power FC and noticed the AF ratio drop down. i searched around and find nothing on it... i am fantasizing it is an AFR autotune.

howard

 

You can use it to make adjustments to your base map, same as correction, but its not exact or very accurate or auto tune. Instead of guessing that you might need say 3% more fuel to get your afr richer to a desired Afr, you can subtract or add to the afr number in the inj map. I change those numbers to 11.5, so then when I want to get my afr say .5 leaner in a cell, just add .5 to the afr correction and test to see how much the afr changes. It usually changes about half as much as you tell it to. So its easy just like adding or subtracting to the regular correction map. I wish there was a ecu that would auto tune, just insert your desired afr and the ecu would learn and auto tune.

 

You can play around with it and see how much a change to the afr number will change the correction % and how much the basemap changes. Right click on the map, go down to inj map and then click on stoich 14.7 and you can change that number that you want to see so when you are making corrections using a afr number it makes more sense, I changed mine to 11.5, this doesn't change your base map just the number you see. Then after making changes you can do a recalc too.

a 5.1% change in the correction map will change the afr number in the map by .62, .949 = 12.12 AFR starting with a stoich 11.5. And in my experience your actual afr will not change that much, so it's safe to make changes to the correction map by changing the AFR correction how ever much you want to try to get your afr to the desired afr you want to run

 

thanks Tom.

i can see where it could provide some quick help. i do use an Excel calculator/ spreadsheet which works great for zeroing in on what i want AFR-wise.

BTW, it looks like you have a really nicely sorted FD.

howard

 

Ya excel spreadsheets and line graphs are nice to use also. Thanks

 

Tom you sort of inspired me to start learning to my own tuning. I know our car is very senstive that's why I try to let the professional do it, but I do all of my work myself so I might as well start tuning. However I follow most of ur post, when u mess the fuel richen process do adjust timing/split timing? Or u jsut add fuel according to your afr? I know it has be more than just adding the fuel? Or I can be wrong not the first though.
Khris

 

You can use the pfc base leading timing map which is conservative, then make your timing split more conservative in the boost rows, you can use 12 split on the whole map below 16000 Pim for example, you want that more conservative slit in the boost rows for high boost. Then you can just do afr tuning with the inj map, dataloging with afr. That's the basics to start out. Make small changes, lots of testing and analysing