Pulls right ... pulls left ... pulls right again?!
Discussion
My 997.2 C2 is pulling to the right, which is especially noticeable under acceleration on a straight, flat road (yes I found one, a long one too).
I had it back to the Porsche indie for them to replace both front lower wishbones due to a frontend creak and preform a full geometry. This cured the creaking and the pull to the right ... but now it pulls to the left, albeit not quite as much. Interestingly, I noticed that the rear wheels had been swapped side-to-side too (identified by a light scuff to one of the rear alloys).
This got me thinking about the sequence of events and changes that have occurred along the way...
Creaks from front, car pulls right on acceleration.
Conclusion: Get creaks attended to and full geo
Action (1): New front arms fitted + geo the car + rear tires swapped side to side (no idea why).
Result: Creaks gone, car now pulls left on acceleration.
Conclusion: Is this really a geo’ thing?
Action (2): Check all tyre conditions (tread wear, pressures, age, brand)
Result: All uniform side to side. No under inflation. All Michelin N2 PS2 same age.
Conclusion: Could this still be tyre related?
Action (3): Swap rear tyres side to side ... no other changes.
Result: Car now pulls right on acceleration.
Conclusion: One of the rear tyres is causing the issue.
As an engineer (albeit not vehicle chassis eng), based upon the above, I suspect some form of radial tyre pull or tyre conicity on one of the rear tyres.
Any other ideas before I fork out £500 for new rear tyres?!
I had it back to the Porsche indie for them to replace both front lower wishbones due to a frontend creak and preform a full geometry. This cured the creaking and the pull to the right ... but now it pulls to the left, albeit not quite as much. Interestingly, I noticed that the rear wheels had been swapped side-to-side too (identified by a light scuff to one of the rear alloys).
This got me thinking about the sequence of events and changes that have occurred along the way...
Creaks from front, car pulls right on acceleration.
Conclusion: Get creaks attended to and full geo
Action (1): New front arms fitted + geo the car + rear tires swapped side to side (no idea why).
Result: Creaks gone, car now pulls left on acceleration.
Conclusion: Is this really a geo’ thing?
Action (2): Check all tyre conditions (tread wear, pressures, age, brand)
Result: All uniform side to side. No under inflation. All Michelin N2 PS2 same age.
Conclusion: Could this still be tyre related?
Action (3): Swap rear tyres side to side ... no other changes.
Result: Car now pulls right on acceleration.
Conclusion: One of the rear tyres is causing the issue.
As an engineer (albeit not vehicle chassis eng), based upon the above, I suspect some form of radial tyre pull or tyre conicity on one of the rear tyres.
Any other ideas before I fork out £500 for new rear tyres?!
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