I had my car for MOT my rst is running cossy mag
we turned the co down from 12,8 to 8,8 we could not get it lower
:-/ but i was in luck he did not mesure the co but i also lowered the boost to 7psi
but later when i turned up the boost to 16psi
and ajusted the co up the car now makes a fuel cut
when it comes over 2500rpm :-(
could it be an ajustment problem?
Help.......