Best type pressure for 60-130 mph / 100-200 km/u

[snoep]

Hi all,

What is your experience with the best tyre pressure to realize the fastest 60-130 mph / 100-200 km/u acceleration?

[snoep]

This is what ChatGPT says:

For achieving the best 100-200 km/h acceleration on your BMW F10 M5 with 20-inch wheels and 784 hp, you’ll want an optimal balance of grip and rolling resistance for both the front and rear tires.

Rear Tires
2.3 bar on the rear tires is likely the optimal choice for balancing grip and rolling resistance. With this pressure:
Grip and Contact Patch: At 2.3 bar, the tire has a slightly larger contact patch, providing sufficient grip to reduce slip under high acceleration without significantly increasing rolling resistance. This makes it ideal for strong acceleration, where traction is crucial​.

Comparison with Other Pressures:
2.2 bar: Provides even more grip due to a larger contact area, which can help if you experience any slip. However, this slightly increases rolling resistance, which may not be optimal for pure 100-200 km/h acceleration.
2.4 bar: Minimizes rolling resistance slightly more, which can be beneficial on very smooth roads but at the cost of reduced grip. For your power output, this could result in some slip during rapid acceleration shifts​.

Front Tires
For the front tires, a higher pressure of 2.7 bar is generally beneficial for stability and reduced rolling resistance at high speeds.
Advantages of 2.7 bar in the Front: A higher front tire pressure decreases rolling resistance, contributing to stability and responsiveness in steering, which is important during high-speed acceleration. This setup also ensures the front tires don’t add unnecessary drag, keeping acceleration as efficient as possible.

Summary
Rear Tires: 2.3 bar provides an optimal blend of grip and efficiency, likely the best choice for quick 100-200 km/h runs.
Front Tires: 2.7 bar helps to reduce rolling resistance and improves stability, supporting overall acceleration efficiency.
This setup should offer you an excellent starting point for fast, controlled acceleration, maximizing the capabilities of your M5’s power.

[m5rosco]

I find around 30 psi/2.06 bar (cold) best balance between straight-line traction, and decent cornering too. This equates to about 35 psi/2.4bar when tyre is up to temp.

A little bit less (about 28 psi/1.93 bar) might be optimal for Dragy runs but you can feel the car floating around laterally in the corners, so not so nice day to day.

(All based on personal experience, using 295 MP4S)

Also consider where you are shifting at. Experiment a bit! I find changing at 6500 rpm works best, rather than redline.