Mick63

fix battery issue before worrying other issues as they may come good with a good battery

actually eliminating wheel slip on the dyno can result in a more accurate tune, plus the bonus a higher dyno sheet

which is why derived torque eliminates any associated gearing issues resulting from different rolling heights, gear choice etc

On the road a smaller wheel is like changing diff gears and on some dyno's this may be true re the power number, but not on mainline and torque remains constant if derived torque is used

correct about lighter wheels, but a larger wheel, even with the same weight has the bulk of the weight further out from the axis so will affect it

car will accelerate quicker on the street though assuming traction is not an issue

a well known tuner who always has higher numbers than everybody else, had a set of "control tyres" that he used to help eliminate wheel slip and generate the higher numbers, it has been mentioned that it was a cheap set left out in the weather for a long time to "cure"

Nitto's are no good on the dyno, expect slightly lower but inconsistent readings, makes accurate tuning hard

timing case and sump off, whether you pull the engine out or drop the k frame is up to you