having a dyno is just like having your car on the open road minus wind resistance , curves, and traffic.

you can simulate any load at any rpm range except for max max max rpm and max max max load, but you can extrapolate for there anyways. even then, you won't hit much more than the max on the air flow meter than you do on the dyno. we have too much experience doing these things to not correct the rest of the map either.

educated guesses?? more like wideband o2 readouts from the dyno and knowing what the cars like.

we change all of the values to compensate for different injector / maf combinations

experience and dyno gets the maps right. and when you have one of our ecus in the car, they start up the first time, kick on with a/c perfectly, and you'd never know they had a larger injectors or larger maf on them. they're that good

What ecu are you tunign on, an 88-89 ?