Asm patch needed for that
You can also mess with the lambda linearization, but then you need external lambda to see what the real afr is
![Tongue](http://nefariousmotorsports.com/forum/Smileys/default/tongue.gif)
Code patch is the correct way tho.
Although this 14.7 to 15 is a waste of time. You're not gonna save any noticeable amount of fuel.
Different story on LPG where you can run 17-18 afr without the engine misfiring.