E55 Bulldog

I have recently bought a 991.2 GT3RS and Im still getting used to what is normal. I have noticed that when I steer to full lock I get clucking. Feels like when a locked diff skips on pavement. I get this is both directions.
Is this normal?

rob944s2

I get this as well, usually only when the tires are cold. Someone smarter than me can chime in but I believe the reason for this skipping feeling has to do with the width of the tires. The outside of the tire wants to travel farther than the inside of the same tire, but can't, because it's the same tire. That explains why it only happens at full lock. Also possibly why a warm tire may do this less as it has more give.

Someone will probably tell me how I'm completely wrong but that's what I've heard. It also happened on a BMW M6 I used to have, I think for the same reason.

LexVan

Akerman effect. Normal.

E55 Bulldog

Awsome, Thank you. Like I said, just trying to figure out whats normal and whats not. Cheers.

Palting

I had to googele"Ackerman effect". chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/viewer.html?pdfurl=https%3A%2F%2Flongacreracing.com%2Farticles%2Ftext%2F Ackerman.pdf&clen=70858&chunk=true

Anyhow, I think it's a little simpler than that. Cold tires in cold weather, especially R compounds, do not grip well. So, at full lock, the rear tires push forward while the front tires "crab" slightly sideways from their intended direction and give that "clunking" sound. Warm weather, warn tires, tires grip better, do not crab sideways at full lock, no clunking sound and a tighter turn. Normal for our cars. I like the KISS principle

bogey1

Its annoying, but normal!

rob944s2

This explanation makes the most sense to me.

Chris88

I try to avoid full lock steering, as the car just doesn't seem to like it. It's even worse if you're on uneven pavement (curbs and dips).

LexVan

Also known as The Acorn Effect. Many threads on this topic. Here's one of many:

Public Service Warning From LexVan - Rennlist - Porsche Discussion Forums