Originally Posted by
mekkis
Steady state loading on a dyno is great to hit the individual cells of a VE map and play with ignition timing, idle stuff not quite so well, but I can still approximate most on/off throttle quirks a big cam has while on the dyno. But the REALLY big cams tend to be a pain.
The best thing in that situation is to not bother fighting the idle, and use the throttle follower like Ford's Dashpot function. It saves a LOT of time. Add in a lot of air across the TF, throw in some TF decay delay, and reduce the TF decay rate so that the air you've added in comes back out slowly. The IAC will act proactively and slow the engine's natural decel down, hold idle a few hundred rpms above target for a second until the TF decay lapses and idle trims kick back in, and then she falls right into target idle with no static.
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