71 Duster Dyno

https://youtu.be/iu447kSmPGEFinally had a chance to take it to the track, was super nervous for a first timer but had a blast. I ran with street tyres and a very conservative launch spun through 1st and most of 2nd once it hooked up it went really well but could never hold 4th flat past 150kmh because it was swaying violently. Ive attached a vid for your reference any advice on why its swaying so much would be appreciated.

Ran a 13.4 @ 109mph


At 109 you should be in the 12.10-12.20 range, maybe a tad quicker. MPH is HORSEPOWER and ET is hook.

As you already know, you need to work on the hook first. Then we need to get you to put your right foot on the floor, and never lift it until you hit the stripe or the wall:finga:

You are giving up a bunch in the gear change.
Think about a 2 step.

What clutch do you run?