I ran slapper bars on the Spirit with great success. A friend of mine has a Spirit also (a little quicker and lighter than mine) that had slapper bars on it too. He bought CalTracs and installed them on his and didn't pick up anything at all.... we had the slappers dialed in that good. Mine was preloaded a bit on the right side and the car launched straight and level and would get a couple of inches of air every time and it seemed to launch good no matter how bad the track was.

Both of our cars had a little problem when shifting into second on marginal tracks though. You could feel the rear end lift, but not bite.

My 60's were right at 1.58/1.59 when it was a good day and the car was running 7.25 or so.... that was in real good air at Ennis.

Here is a video of the car launching against another car I built. the wagon is using Cal Tracs.





http://www.youtube.com/watch?v=wOE6iwt9Dao I fixed this...... DOH!