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?!
Might be better to save on speculative acquisition and book yourself into a set-up specialist like Center Gravity, honestly. Give them a call, at least.
Personally I would say it's a worn bushing somewhere (subframe, perhaps), but there are so many possible causes, you could end up spending thousands and still not fix it.
Personally I would say it's a worn bushing somewhere (subframe, perhaps), but there are so many possible causes, you could end up spending thousands and still not fix it.
If swapping the rear tyres side to side consistently moves the pull, then it has to be a wheel or tyre issue surely?
Can you find a wheel and tyre specialist to find out where the problem lies? I'm thinking it could be a damaged rim so somewhere then can test they're true would be good before buying new tyres.
Can you find a wheel and tyre specialist to find out where the problem lies? I'm thinking it could be a damaged rim so somewhere then can test they're true would be good before buying new tyres.
the toe was quite a lot out on the right rear so that would have worn different to the left rear.
now the tyres have been swapped over, plus you how have more toe on left also.
cars is quite old has it had new toe links or bushes ?
depends on the pull or is it just a slight drift when you take your hands off the wheel. or is it on acceleration it pulls.
now the tyres have been swapped over, plus you how have more toe on left also.
cars is quite old has it had new toe links or bushes ?
depends on the pull or is it just a slight drift when you take your hands off the wheel. or is it on acceleration it pulls.
I've just picked up a 987.2 CS which veers slightly left (more than road camber should cause!), despite Porsche aligning the car (through the previous owner) only last week. I've just booked it in with a trusted alignment specialist who did a great job on my Audi and last Porsche so I'd say this should be your next step.
Good luck
Good luck
A bit of a shame they didn't try harder to get the rear toe figures to match.
And any idea if they settled the car after the first set of adjustments? The changes between before and after are quite significant - if all they did was change the settings and then called it good there's a fair chance they left some preload in various bushings meaning that as soon as the car is moved the settings change again. A thorough shop will roll the car back and forth and try to bounce the suspension after a major setting change to remove any preload.
And any idea if they settled the car after the first set of adjustments? The changes between before and after are quite significant - if all they did was change the settings and then called it good there's a fair chance they left some preload in various bushings meaning that as soon as the car is moved the settings change again. A thorough shop will roll the car back and forth and try to bounce the suspension after a major setting change to remove any preload.
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