My car was mapped 2 weeks ago for 0.8bar, 1.2bar, and 1.3bar. Today i noticed in 3rd gear @ 1.3 bar comes in rich in the 11s, and @5.5-5k goes into the 12s 12.5 I've seen, then after 5.5-6k richens back into the 11s. 4th gear is bang on between 11-12afr i tested the other pressure settings and all in between 11-12afr. So im thinking why in 3rd gear and @1.3bar it runs leans for a short time... any ideas would be great Am i right i should be going for grade 8 sparkies ? running just under 270hp and using grade 7 atm.