Door jamb says 37F/43R but PCM wants ~32F/34R. Which pressure should I use? (2024 Taycan base on 21” Continental ProContact RX)

[phantom35]

I have a 2024 Taycan base RWD on 21” Continental ProContact RX tires. I mostly drive solo in SF, no cargo/passengers.

Door jamb says 37F / 43R cold, but the PCM deviation screen seems to want around 32F / 34R. Dealer said PCM is more accurate, but the difference seems huge.

At the higher pressures the car felt very bouncy/harsh and a bit sketchy. After lowering to the PCM range, it’s less bouncy, but I still feel a lot of road texture/harshness. I also had an alignment check showing toe/steer-ahead issues.

For daily solo city driving, should I trust the door jamb, the PCM target, or is there a specific tire/load/comfort setting I need to verify in the PCM? Is 32F/34R normal or too low for this setup?

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[whitex]

Door jam shows factory wheels+tires value, not sure if full or partial load. PCM shows values based on wheel size, tire type, and full/partial load. PCM also gets updated over the air, unlike the door jam. Bottom line, go with the PCM, after making sure you set the correct wheels/tires/load in the wheel settings.

 

[SoccerMan94043]

I have a 2024 Taycan base RWD on 21” Continental ProContact RX tires. I mostly drive solo in SF, no cargo/passengers.

Door jamb says 37F / 43R cold, but the PCM deviation screen seems to want around 32F / 34R. Dealer said PCM is more accurate, but the difference seems huge.

At the higher pressures the car felt very bouncy/harsh and a bit sketchy. After lowering to the PCM range, it’s less bouncy, but I still feel a lot of road texture/harshness. I also had an alignment check showing toe/steer-ahead issues.

For daily solo city driving, should I trust the door jamb, the PCM target, or is there a specific tire/load/comfort setting I need to verify in the PCM? Is 32F/34R normal or too low for this setup?

Use the TSB and find your car for the recommendations: https://static.nhtsa.gov/odi/tsbs/2026/MC-11027133-0001.pdf

Door jam shows factory wheels+tires value, not sure if full or partial load. PCM shows values based on wheel size, tire type, and full/partial load. PCM also gets updated over the air, unlike the door jam. Bottom line, go with the PCM, after making sure you set the correct wheels/tires/load in the wheel settings.

They show full load on the door jam.

 

[RED!]

I took the Tech Bulletin and summarized it for my GTS ST, here are the results

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