LexVan

Hey Guys/Gals and Chuck, check those tire pressures. Temps are starting to drop with the changing of the seasons, and you'll see this in your cold tire pressures.

And get ready for The Acorn Effect. I know exactly what this is, and it still freaks the hell out of me when the car is parked and cools way down. I thought a wheel fell of the other day.

Be safe.

gbree

What exactly is the "acorn effect"? I've never heard that term before.

LexVan

Here:

https://rennlist.com/forums/991/7861...n-reverse.html

hinckley

Yup - right on schedule. My TPM light went on yesterday after my car sat for five days while I was traveling. All my tires had lost about 4 psi. I drove over to my dealer and the service manager told me I was the fourth person to stop by to bring the tires up to pressure.

gbree

Interesting, I'll have to look out for that. Thanks!

Hurricane

Ha! Felt it for the first time this year yesterday as the temps started dropping. In a month or two I will swap back to the winter wheels...

Jim M.

It's supposed to get to 93F today. Not worried yet.

Cheekymonkeyman

Good pre-emptive warning Lexvan - thanks.... We have real acorns as well.... Plays all sorts of tricks on my mind Cheers

Grunty

Well played!

991TurboS

There is another "acorn effect" to watch out for as well. With fall here, be careful not to park under oak trees. The falling acorns can ding your car.

SamDaMan

I got my GTS last November, and the acorn-ing freaked me out. I took it to the dealer and he let me drive another 911 and a Cayman to prove this was "normal"....ahhhhhh the mysteries of Porsche......

mmaturo

Two of my Audi's do it too especially my R8 backing up and turning then forward...glad I knew what it was but it is disturbing the popping it can make. Learned same way when temps in my Chicago parking garage were low.

STG

Cold temps are here. Bump for the warning!

Have been posts about it yearly since the 991 came out. Good to bump this one every Fall and going into winter!

dflowerz

Thanks for posting. Won't get my car until next March ( I hope ), but that sound would freak me out for sure. Nice to be warned.

Archimedes

Yup, I get it on all three of my cars when I turn sharply backing out of the driveway. Sometimes it's quite loud and startling, but usually it's nothing much.

Regarding pressures, I check my pressures constantly anyway, so I never get caught out when the temps change. Got in the habit of checking them before every ride on my motos that now I probably check them too much on my cars.