04 Mustang GT U7146 how to add fuel

[EVOLVEDNOTTAMED]

I want to add a little fuel in the 4K-7K range.I was wondering how I would do that in the predator.I manual says negative value adds fuel, but on the screen it has lean stock rich.Do I move towards the rich or toward lean to add fuel?

[mikel]

Move toward rich.

[EVOLVEDNOTTAMED]

Thanks for clearing that up for me.I was wondering.

[EVOLVEDNOTTAMED]

So say I was at 13:1 A/F If I went rich .5 that would put me back into 12.5:1
right?

[mikel]

No, that would be .5% richer than 13:1, which is not much of a change.

Adding 10% would take you to 11.7:1 (13 x .10=1.3, 13 - 1.3=11.7:1)

[EVOLVEDNOTTAMED]

So it's percentage then.Makes sense, thanks!