Sounds to me like just after a gear change the engine RPM's started to climb again normally at first, and then the RPM's started to zing under power just before the car turned left. If you look at the clip in full screen mode you will see that just as the RPM's started to zing there was a smoke/haze trail starting to come off both slicks just before it turned left.
So my guess is it just lost traction & turned left from simple tire spin or shake. What caused the loss of traction could be anything, too much boost coming in down track, no down force from lack of a rear deck wing (none that I could see in the clip). Or something getting under the slicks such as oil, water, oil-dry, etc, etc either from the car its self or already on the track surface.
460 street '66 Ranchero.......................finished someday.
460 race '70 Maverick..........................finished someday.
All 'glass Top Sportsman '69 Mustang......ummm, check back when I win big playing the Texas Lotto, or online poker.
page. Some ancient & newer local race video.
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