Originally Posted by bigD

I got this off pgmfi along time ago, it helped me set up my aem on crome pro but should work for freelog to.

Getting set up:
- Get your car to idle a bit higher than normal to keep it from fluctuating the AFR (use the IACV slider or something else easy).
- Bring the car to a full warm so that the ECT and IAT compensations won't be affecting the results.
- Note your current fuel offset.
- Make sure realtime programming is enabled.
- Hook the multimeter on the battery terminals and bring the multimeter in the car so it's easy to read.



Set up the wideband table
- For simplicity, let vO2 be O2 sensor voltage in Crome, and let AFR be the recorded votlage beeing seen by the wideband.
- Note the current vO2 and AFR.
- Increase or decrease the fuel offset in marginal increments to get the AFRs to go up or down by 0.4~0.5. (Depending on your car and injector setup this could be a large or small change to get the results, just start small and work up from there).
- Note the resulting vO2 and AFR per fuel offset changes.
- Construct the table from AFR 11.0 to 16.5 (roughly 0.5V to 3.8V) --> if you have a 0-5V mod done on your ECU, which is highly recommended, go a little higher in the AFR range.
- It is recommeneded to do a few more readings around where you will be tuning the select ranges (boost 11.5-12.5, normal drive and idle, 13.5-14.5) for increased resolution
- Take the table you constructed in Excel (or Notepad, whatever) and put your results in the Options menu in Crome.
- Verify the effectiveness of your table by changing the fuel offsets and see if Crome matches the UEGO.
- Put the fuel offset back to it's original number (that's why we noted it!)