Tony,
Yes, we can adjust the loading to some extent. We are able to change the sweep control method on our dyno from "vehicle simulation" to "controlled sweep rate" with the latter being relatively close to Dynojet sweep rates. The result is reduced loading and often another 10hp or so.
However, we also see that when we take a car that pings in "vehicle simulation" mode (from having too much timing for the combo) and run it in "controlled sweep" with an artificially shorter sweep duration, the reduced loading masks the pinging and the car appears to "run just fine". Of course, now that it's not detonating, it also magically picks up another 20hp (the same way it would with the proper programming tweak under correct loading). This is precisely why I prefer to run all of our tuning in "vehicle simulation" to make sure we know if it's going to ping or not before delivering the vehicle to the customer.
Yes, we have run vehicles in identical trim to how they were run on a Dynojet earlier for the purpose of seeing the difference. Typically, we see about 20-30hp difference, but this depends on the combo.
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Greg Banish
President,
Detroit Speedworks, Inc.
'93 LX Turbocharged Road Racer
'00 Bad-Ass F150