2006 987S - Strange handling

[RFB]

Hi,

I had two new rear tyres fitted via OPC at the weekend. Few days after I detailed the car and took all four wheels off.

Having just used the car on Motorway for first time since, there is something very strange about the handling. The car feels incredibly twitchy, and has a pulling from side to side feeling.

Any ideas what on earth this could be?

All tyre pressures are spot on as per door card, wheels are torqued to 130Nm as per manual and all four tyres are matching.

Help?

[jimmsy]

You didn't accidentally rotate the wheels when removing them?

[RFB]

jimmsy said:

You didn't accidentally rotate the wheels when removing them?

Took one wheel off at a time. So all four were returned to original position...

[RFB]

P.S Is this a joke...

[boxsey]

Might be worth trying if for a few more miles before doing anything. New tyres need some miles to get rid of the releasing agent. The initial slipperyness as the releasing agent comes off is much more noticeable on a performance drivers car than a more mundane one. I also find motorways to feel more twitchy than other roads because of the ruts in the road created by lorries. So they're not the best roads to check if you have a problem or not.

[DJMC]

Did you replace the rears with the same make/model/size/spec of tyre?

[RFB]

DJMC said:

Did you replace the rears with the same make/model/size/spec of tyre?

Yes, Michelin Pilot Sport 2 (N4). Matches front pair too.

[Buzzlt]

Food for thought - maybe check to see if the inner bolts for your coffin arms (lower wishbone) are tight where they attach to the chassis. They are supposed to be tightend when the car is on its suspension. I learnt this the hard way and the car was all squiggly and all over the place. Jacking the car up may have allowed them to move upsetting the whole geometry. Allegedly they only last about 50k anyway of the centre bushes are worn out your geometry won’t stay the same one day to the next.

[RFB]

Buzzlt said:

Food for thought - maybe check to see if the inner bolts for your coffin arms (lower wishbone) are tight where they attach to the chassis. They are supposed to be tightend when the car is on its suspension. I learnt this the hard way and the car was all squiggly and all over the place. Jacking the car up may have allowed them to move upsetting the whole geometry. Allegedly they only last about 50k anyway of the centre bushes are worn out your geometry won’t stay the same one day to the next.

Thanks for the input. Will certainly have a look.

May book the car in to Centre Gravity for full geo check and setup.

[Eddie Strohacker]

Obvious but on first principles, the wheel bolts are all tight & torqued, right?

[fridaypassion]

Its not impossible to knock the control arms on the rear of Porsches with the rear wheels going on and off. Get the Geo done I would recommend ONLY somewhere with a Hunter 4 wheel setup. A lot of the bigger tyre chains have these. I have found this to be the only way to get the geo spot on with P cars they are very very sensitive to even the slightest change of rear toe and it can make them feel properly odd with only a tiny discrepancy on the geo.