AndrewR

Thanks Adam, open loop AFR has not been enabled up until now. I have however tuned the engine manually using datalogging against the AFR target table below, focusing mainly on what it needs for nice idle and light cruise, and wide open. I have now added rows to that same table (below) for AFR in boost and leaned 100kpa back a tad. I take from reading the help info and your post that if I now enable open loop AFR it will add fuel based on the delta between stoich and the table value, meaning it would add fueling across the board, including the atmo areas that are currently tuned? If so, is there a workaround for that or should I bite the bullet and take fuel out of the main table and let this add corrections everywhere? Cheers, Andrew

Hi, I have a naturally aspirated Hilborn IR setup on a SB Chev in a road race car, controlled by a G4 xtreme running alpha N (main fuel table TPS vs RPM) with fuel equation load = MAP. It is well tuned with 12.8 AFR at 100% TPS across the rev range. I have an integrated Innovate WBO2 for datalogging and tuning but run open loop. I am turbo-charging it using a custom plenum with the same intake set-up. I have enough injector capacity so all I need to do is add fuel once I go above atmospheric Do I just maintain my current main fuel table as is, and add a 4D fuel table MAP vs RPM, setting all values below 100kpa to 0 and start by trimming it around 10% richer as I move into boost to achieve my target 11.5 AFR? Thanks for your help. Cheers, Andrew. Wellington NZ