Everyone in favour of road mapping always picks on the size of the fan. Our fan flows 35000CFM through a tapered nozzle, to increase air-speed.

We monitor air temps and coolant temps and if either rise beyond an acceptable 'window', the run stops.

I'll try and do a video one day to show how accurately we can reach each and every load site on the rollers. There is ABSOLUTELY NO WAY you could ever do that on the road and only by reaching each load site accurately can you map it effectively. As soon as you begin to approach the next site in and direction, the ECU will interpolate the values. It takes a few seconds to stabilise, even on the dyno. On the road, to reach one load site accurately would take quite some distance and there may be 200 or more of these to do. Trust me, mapping on the road is comprimised.

Also, as has been said earlier, what reference do you have on the road as to whether timing changes have had an effect?