Tuning with apexi neo

[waulpalker117]

I have a 97 gst with the apexi neo 20g turbo walbaro fuel pump 680 injectors I am trying to figure out what my a/f ratio should be lows and his I have started a tune running all - numbers just don't want to be too lean I have a wide band but no data logger yet anything would help

 

[Sjd6795]

I got to head to work so can't explain much, but idle around 15.5-16 and WOT(wide open throttle) around 10.8-11.2. Start by getting the idle perfect then move to cruising speeds and so on until you reach WOT, Also adjust in small increments like 1-3%/-1-3%

 

[waulpalker117]

Ok thanks I'll get to work

 

[waulpalker117]

Ok does anyone have a similar setup like mine with the apexi tuner my numbers are like -30s and I'm wondering if that's right? My air fuel ratio is close to the above comment

 

[lasershark]

To get an approximate number in your head, you need to compensate a % for the larger injectors, I'm sure you know that. The 680s you have are approximately 51% larger than the stock 450's. You want to start slow like SJD said above. I don't know what kind of % increments the Apexi neo runs. I'm not saying you should jump to a 51% airflow compensation just stating the numbers.