I tuned a VE Maloo HSV today with LS2 and e38, M6. Apart from spending 6 hours diagnosing why the motor ran of 4 cylinders.(A broken wire from the heavy handed exhaust fitter) I finally got it running on 8 and started to tune it mafless, we ran into some other minor tuning issues which were quickly sorted but once the sd tune was complete. The MAF was plugged back in. To my surprise the car now idled at 16.3:1 compared to the mafless tune of 14.7:1. Topend mixtures were spot on at 12.9:1 but I had to scale the bottom end of the MAF to get fuel mixtures spot on. And just to prove that this is the correct way of MAF tuning I tried to alter the VVE table(with the proper one saved) to alter afrs at idle and light loads, but It didnt help. Scaling the MAF sore immediate results. So when your MAF is out like this adjusting the VE tables won't help. It required significant adjustment. So I am all in favor for the mafless tune first then maf calibration last! Not fudging figures to get required results