Tyre pressures at Portimao
The lap, to scale. Track outline © OpenStreetMap contributors (ODbL).
How hard a circuit works each corner of the car shows up as tread temperature, and temperature is what sets pressure. GripCalc carries corner heating figures for Portimao as a starting point: how much hotter each tyre runs over the session's base temperature, from the layout's mix of corners and load. They pre-fill the calculator when you pick the circuit, and your own pyrometer readings refine them from the first session.
| CORNER | RUNS HOTTER BY, °C |
|---|---|
| Left front | +2.0 |
| Right front | +1.5 |
| Left rear | +3.0 |
| Right rear | +2.5 |
ESTIMATED — class-based starting values over an 85°C session base, derived from this layout's type (direction, speed profile, load), and shared with circuits of similar character rather than measured here. Not gospel: enter your own pyrometer figures after a session and they take precedence.
What Portimao asks of a tyre
Portimão is a rollercoaster on a smooth modern surface: blind crests, compressions and cambered sweeps that load and unload the car constantly. The vertical cycling makes stable pressures matter, and the Algarve sun can push track temperatures far above ambient, moving the whole calculation.
Track temperature runs well above ambient in the sun; hot checks are the truth
Crest-then-compression sequences cycle loads; avoid soft setups
The long final right leans on the left front onto the straight
A 992 GT3 on Cup 2 R at Portimao
Published hot target 30.5 / 32.0 psi at 92°C tread, on a 15°C morning, with the corner figures above: cold set 21.5 / 21.5 front, 22.6 / 22.6 rear. A different car, tyre or morning moves every number, which is what the calculator is for.
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