if i'm reading it correctly this routine ensures baro is never less than map (should never happen in an n/a engine) so i guess it's a keep-alive separate from update? we might want to nerf it for a turbo system too.

A3CF : LDAA $00DA
A3D1 : CMPA $003F
A3D3 : BLS $A3D7
A3D5 : STAA $003F