444cayenne

Hi, anyone else experimented with tire pressures....... After lots of research I fitted 275 45 20s to my sport technos instead of the recommended 275 40 20s , been running it like this for a couple of thousand miles (just over a years motoring for me) and was using the 38F 42R recommended psi....... After getting a bit fed up with the quite harsh ride I started looking at other cars of similar weight using the same size wheels n tires and found they're using quite different tire pressures, so I dropped the psi down to Audi q8 levels 36/38 psi and it was vastly improved........ Then I found some guy with a range rover sport with 275 45 20 tires running 36 psi all round, so I tried 36.5 psi all round and it feels like a different car, so smooth and can hardly feel it change gear, obviously I'd up the rears if I was loaded up......... But for running around with just me and the wife it's great, any thoughts 🤔

arthropraxis

I recently had new tires put on and the shop under inflated them. While the ride was softer over bumps, the car wallowed in corners. The fronts were under 36 PSI, 34 IIRC and the rears were 40PSI..The ride was better when back to factory spec. The PASM makes a difference over rough roads, put it in comfort mode and it feels like normal over average roads.

444cayenne

Yes, would say there is a sweet spot though as when I was messing about with the pressure due to being parked in the sun I accidentally dropped the pressure to below 35 psi on the front and it did feel to soft......... Whereas the 36.5 feels perfect on that size tire, imo you gain more in ride quality than you lose in handling
In normal driving.

TomF

There are a couple of threads on this out there and it would probably be worth a look if you want to get a broader perspective. I run 37/42 around town and 37/46 loaded for trips over the passes. I too would prefer a but softer ride, but the wallowing referenced above always rears it's ugly head at lower pressures.

Remember, this is a very heavy beast and it doesn't take kindly to incorrect tire pressures. It goes without saying that tire wear is also a huge factor in getting the pressures correct.

444cayenne

Agreed, was just experimenting with recomended pressures from vehicles with simular kerbside weights using the same tire sizes as they were also using 275 45 20 tires instead of the usual 275 40 20 on the 957.

Avec

The Cayenne has an obvious front end push. I have found that running higher pressures up front makes it turn in quicker, and the lower rear pressures make the back end drift out a little on tighter turns like round-a-bouts. Plus, there is no need to run higher pressures in back unless carrying weight back there or towing. I run 47/42 and it runs great

A lot of people point to the door sticker on inflation, but forget that those are the recommended settings for a Soccer-Mom SUV. There is a safety factor built into there numbers. Most people have no idea what to do if the back end steps out, so they recommend lower front pressure to make the front break loose first.