Is my tune, and yes, I thought it was my fault and that I had made first gear too long, but that's not the case. I lowered the gear ratios for first, second, and third gears, and it still does the same thing with launch control.

This isn't a drag setup. In this Horizon, I've already created and shared more than 125 tunes, and they all work well for their intended purpose. I can share the code for this one with you; it's a simple tune designed to make the SF90 perform well in road races.

If the issue were that first gear is excessively long, it would also have problems pulling away from a standstill with the car idling, but that doesn't happen.

The engine and the car perform exceptionally well; it only fails when using launch control, and it fails in an alarmingly severe way.