981 noise from front wheels at full lock

[Aliberg]

I have just bought a 981 and love it! But the front wheels seem to be either rubbing or knocking some thing when turning at full lock. Is this usual?

 

[dpoynton]

Yes, it is normal. Called the Ackermann effect I think, something to do with the suspension geometry.

D

 

[chaser]

Check wheel arch liners for signs of rubbing, but my car will judder on full lock coming off my drive .... combination of cold, wide tyres and extreme steering angle. It is like they are skipping sideways across the block paving. My van also does it, also wide tyres.

 

[AndrewCS]

I used to have this with the PZero N0`s, now that I have the Michelin PS4S N0 the `scrubbing` has all but disappeared.

 

[Aliberg]

Thank you for your prompt replies. This is my first Porsche so all new to me

 

[mr pg]

Yes they (981's) all do this. I'll be changing my Pirellis for the Michelins soon, so will be interesting to see what happens.

 

[tjb]

Same with both our 981's, on full lock when manoeuvring slowly they both did this, as already mentioned not a problem just the way the car is set up, I don't think the tyres are actually rubbing or catching on anything its just the feedback from them as they sort of jiggle whilst on full lock.

 

[Briggy]

The outside of the tyres have further to travel than the inside of the tyres when following a curve. At slow speeds, with wide tyres & a very tight angle, something has to give, so the insides have to skip along. That's what you're probably experiencing.

 

[Dylan1]

Yep
ackerman effect
all very normal for 981
but still irritating I find!!!

 

[MrDemon]

Yes they (981's) all do this. I'll be changing my Pirellis for the Michelins soon, so will be interesting to see what happens.

I'll correct you slightly and say the Pzero N0 does this, not the 981.

 

[MrDemon]

I used to have this with the PZero N0`s, now that I have the Michelin PS4S N0 the `scrubbing` has all but disappeared.

A proper reply

 

[BoxsterLL11]

When I bought my first Porsche, a 987.2 Boxster in December 2015 I too had this noise which I too was concerned about.
I contacted the indy I bought it from and I was told its normal, yes the Ackermann effect.
After 15 months, I changed the 987 for a 981 and this one does it even more than the 987 (19' tyres/wheels as opposed to 18").

Strangely, my son had a 2013 981 Cayman which was involved in a low speed accident but a lot of damage to the front end.
Front end was all rebuilt by a well known well recommended specialist and I assume after the rebuild the suspension geometry was 4-wheel laser aligned.
After that, my son reckoned he very rarely got the "acckermann effect" noise.

 

[MrDemon]

it's tyre hop that all, and yes it's the Ackermann effect but as the p Zero have zero grip (I think that what P Zero stands for) zero grip !! the wheel hops

fit a nice tyre and the wheel does not hop.

I have 4 porkers and have 9 in total the only car that does this again is my 981 SPyder with the p Zero shit on them ! again !!!