Any tips for vehicle stability?

Having trouble keeping cars stable at high speeds, done at least a week’s worth of experimentation with different versions of Inspare AC6. Once my cars pass about 250 mph the wheels start bouncing off the ground for no apparent reason, which is an inconvenience at best and leads to random flips at worst. Tried everything from less/more stiff suspension to increasing/decreasing wheel density, setting wheel elasticity to 0, using active downforce, increasing/decreasing sprung and unsprung weight, messing around with horsepower levels, gear ratios, engine configurations, I feel I’ve run out of options now lol. Does anyone know something I don’t about this type of chassis? would really appreciate some advice.

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Can you provide screenshots or a video of what happens, im interested on helping

Why not limit the speed to below 250? Why do they need to go faster?

Top Fuel Dragsters go 335 mph.
Formula One goes 246 mph.

There are reasons for cars to go that fast.

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A-Chassis is a bit of a rough thing to work with, due to all the complex variables that go into the driving of the vehicle. Try finding a racing community that has cars that run ridiculous speeds, and find out what they do that seems to help them. I’d recommend the drag racing groups, they consistently had cars going over 300 mph.

This is one of the places I can remember:
https://www.roblox.com/games/6724558416/No-Prep-Raceway-Park

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I’m pretty sure this is a problem with Roblox’s very poorly made physics system… Are your wheels models or Parts? I’d assume models have worse collision fidelity.

Also, making the suspension stiffer will make the issue worse.
Maybe you can mess with the torque as well.

https://gyazo.com/50ba74c7f6d3fa8ee96497587c4db5c7
here it is yo. The weird thing is, sometimes ill be able to go up to 350 and beyond so smoothly, other times I can’t crack 170 without shaking like this or worse. All my roads are smooth, the lines are cancollide false, and it happens just as inconsistently on empty baseplates.
Here’s my wheel configuration, they’re all like this except a little less friction, rarely.
image

They’re ball parts. setting the suspension stiffness really low doesn’t seem to help, same with lower/higher suspension travel and dampening

That’s odd. If your using parts for your road, this can also happen where 2 parts meet. Even if it is perfectly aligned it can still result in this.