Harry, you are correct, the video really only shows that some of condition exists. I will attempt brief answers but will likely prattle on as usual.

Tires were six months old, I’ve run a cooked/really old set at a track day and these were not that far gone.

There is less oversteer as the tires heat up but the oscillation is still there just not to the same degree and it was pretty consistent throughout the race.

The oscillation has been there but I do not believe to this degree; with the wider track the corner speed is higher. “Displaying” the issue is the operative word. Previous video clips show the car moving around 4-5 inches (more like McGee’s car) but not 10-12 inches. On my admittedly subjective scale of 1-10 with the video being a 5-6 I’d call what it did before a 4.

Rear suspension is Nissan Competition Springs, with traction bars, 5/8 (16mm?) sway bar. The rear bar bushings attach to the frame with the bar ends clamping to the springs. The sway bar has been on the car since day one.

Benny’s question on the bump stops would have been my train of thought but the axle snubber has been removed, the bump rubbers on the shock are not bottomed. As previously mentioned I raced a stock class car which cornered on the bump rubbers and this behaves somewhat similar but not quite the same.

My thought is that there is a cyclical wind up and release like Benny mentioned. If the axle deflects say 10-15mm how much rear steer does this cause and would the axle movement create this cycle? The bushings are Polyurethane except the aluminum ones for the front shackle to frame mounting point.

I want another set of eyes to inspect everything, so it’s going to my buddies shop, it’s obvious the car can be improved.

Bert as for scary part, as someone who used to road race motorcycles and still does some desert and motocross, this rates about .09 on my admittedly skued fright scale.

If you go to minute 6:50 to 7:30 of this video you can kind see how the car responded before.

https://www.youtube.com/watch?v=9NE5zGOs76A


Tom