What are the solutions for a car feeling unstable at high speeds?

[MacGeorge]

The solutions for a car feeling unstable at high speeds are: 1. Front wheel alignment: The purpose of front wheel alignment is to ensure the automatic return of the front wheels during steering. Check the automatic return function of the front wheels. 2. Loose connections in the front suspension: Loose connections or gaps in the chassis suspension can affect high-speed stability, leading to the car feeling unstable at high speeds. 3. Tire performance: The quality and performance of car tires can also affect driving stability. High-quality, wide tires can perform better at high speeds. 4. Wheel balance: Poor wheel balance can easily cause bouncing and disturbances during high-speed driving. 5. Chassis suspension: The chassis and suspension are the foundation of a car. An unstable foundation can make the car feel unstable. Regularly inspect the front suspension before high-speed driving.

[DiRuby]

I just got back from a highway drive yesterday and noticed the car feels a bit floaty above 120 km/h. I've fixed this issue myself before. First, check the tire pressure—all four tires must be at the manufacturer's recommended level; too high and they'll bounce, too low and they'll wobble. Then, get a wheel balance and alignment done; misaligned wheels will definitely make the car unstable at high speeds. Last time, my right front wheel was misaligned, causing the floatiness, and it cost me 200 yuan to fix. Also, inspect the suspension system—if it's an older car, the shock absorbers might be worn out, causing wobbling over bumps. Finally, avoid stacking too much luggage in the trunk; a heavy rear end can make the front feel too light. These steps usually solve the problem, but if not, consider installing chassis reinforcement parts.

[EleanorMarie]

Don't panic when experiencing floating on highways. After driving for over 20 years, I've summarized some practical methods. First, maintain proper sitting posture with your back against the seat, and rest your hands lightly on the steering wheel without gripping too tightly. When speed exceeds 100 km/h, pay attention to crosswind warning signs. Don't force overtaking in strong winds, especially when crossing bridges - ease off the throttle slightly. For regular maintenance, be extra careful: check tire pressure at least monthly (2.3-2.5 bar suits most vehicles). I remember last year when my old Passat floated on the highway - it turned out the rear tires were severely unevenly worn. After replacing tires and doing wheel alignment, it became rock steady. Also, check for undercarriage damage or deformation before high-speed driving.

[SanCecilia]

The car feeling floaty is actually related to its inherent characteristics, and I've researched this issue. SUVs and MPVs with high centers of gravity are prone to floating, and you might consider switching to shorter springs to lower the height a bit. Tires are the most critical factor—worn-out treads have poor grip, so it's best to use wider tires for high-speed driving in summer. If the wheel's dynamic balance error exceeds 20 grams, it's dangerous, and this requires professional equipment to measure. Some cars have design flaws from the factory, such as overly soft rear suspensions that can cause lateral sliding during high-speed cornering. I encountered this issue during a test drive of a certain domestic car model, and it was only after adding wheel spacers that it became somewhat more stable. If you really can't resolve it, I recommend going to a racetrack for a high-speed balance test, which is more accurate than a standard wheel alignment.