Quote:
Originally Posted by gnicholson
First off the race pack and tach may be off compared to each other. Also the car is loaded differently against the trans brake than it is going down track. I only use the playback on the tach to check my cruise rpm after a run. If its 100rpm low I will unplug the stop and run it against the brake like you and note the rpm . I then make an adjustment and recheck untill its 100rpm higher . In other words I just use the brake rpm as a reference in order to set the rpm to what I want based on the playback of the last run. Also you only use one instrument this way
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On our car we usually see 100 RPM less on the playback than on the RacePak. We use a linkage stop and have determined that we'll see approximately 150 RPM difference for each full turn of the stop nut.