Drivability for radical cars works just as well with Speed Density. Holley has no "preferred" way, but the box is capable of doing it any way the tuner chooses to do so. That being Alpha-N, Speed Density or a combination of the two. We have had no issues making Speed Density tuned cars drive quite well on the street and have done so with several Drag Week cars. Now while Alpha-N might be "easier" for a novice tuner, the other method works just as well once the tune is sorted out.

Now Holley may "suggest" certain things, because they know it will make it easier for the average tuner to deal with and therefore cut down on tech calls.........but, either way works. The engineer who designed the system at Holley, just took his pump gas Drag Week motor off the dyno. It made over 900Hp and will be going in his car for this years Drag Week. It is tuned in Speed Density

Monte