Thanks James,
We do not have an afr plot, we used a handheld device to test afr under load.
I've also not tried adjusting boost pressure to see if this helped. Do you think this could be all that's at fault?
If so I will try to go back for another rolling road session this weekend as the guy is away for 2 weeks from Monday.
I take it the boost is raised by just winding in the actuator rod a few turns?
Cheers
Derek.