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Powerdna

981 S slow speed turning hop?

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I am having an issue with a brand new Boxster S with optional 20" wheel and PDK. When turning left or right (full lock) at low speeds the car hops significantly. Very similar to 4 wheel diff lock on dry pavement. I am wondering if this is expected due to the large OEM wheel options or a potential real mechanical issue. Any opinion suggestions appreciated. Thanks in advance. Andrew

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This issue has been discussed several times, this is a normal phenomenon with cold tires and lower outdoor temperatures. Once the front tires are warmed up, will reduce the scratching. Do a search in the 986/996/987/997 forums and you will undoubtedly find much more inf about this issue.

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Normal? Cold tires? Really? I've never heard of anything other than 1) a limited-slip differential issue, or 2) too much/not enough Ackerman effect in the front suspension, causing something like this. What other whacky surprises does Porsche ownership have in store for me?

Edited by 1analguy

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i had the same issue with my 981 with standard 18's. supposedly it's worse with the 987, btw. but the hop *does* go away, and the serivce tech confirmed that it's normal. as a guess, it's a combination of wheel camber, wide tire and possibly not-perfect-turn-angle on one tire causing the hopping. yes, it's royally annoying and somewhat frightening.

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Somewhat frightening? You've got that right. My first encounter with this was taking my new Boxster with 20" wheels and PDK to the grocery store... When I went to back out of the parking place I had this happen and my first thought was "what did I just back over?".

I don't recall this ever happening on my 2006 Boxster S with 19" wheels and manual transmission.

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Nearly all the big tires and wheels will do this, especially when cold.  It's not a high hop, just should feel like some jerkiness, or letting go / catching.

 

It will do it if you go into a corner too fast, too.  Called understeer.

 

Find a physics guy to explain the theory.  Worse with bigger wheel / tire, but, don't we like how they look?  

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