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Body wobble with quick direction changes

Zak911

Silverstone
Joined
28 May 2024
Messages
136
I come from a Cayman which was a manual with standard springs and shocks, and which had done over 120K miles, so pretty worn in. In dry, calm conditions the car felt stable and handled superbly.
I've noticed a couple of differences when driving the 911, some of which may be normal 911 'features' and some may not.
I know the Cayman is mid-engined so the 911 is going to feel different, but these differences are spoiling my enjoyment of the 911 as it doesn't feel safe to drive spiritedly.
I should say I got all four bottom (coffin) arms as new, both rear upper track, 2 front tuning fork arms and a 4-wheel alignment when I bought the car

Driving normally the car feels fine. Doesn't track, steers smoothly, great corner turn-in, no odd bumps or squeaks
Under WOT the car feels light on the front end in a straight line and quick changes of direction induce strange body roll.
Worse, on overtaking and on the overrun the body roll is exaggerated. For example, overtake, lift off and sharp turn in to the left lane again then sharp correct to straight. On the correction to straight the car will lean to the right then correct and lean to the left - a distinct wobble.
If I drive in a straight line and do a sharp left then sharp right turn of the steering wheel (driving like Fred Flintstone) the car adds an extra wobble to one side after correcting to straight.

I've recently added a DSC controller which has made the ride better, but hasn't solved this. I mean, its not undrivable by any means but it doesn't feel taught like you would think a sports car ought to?

Do I need to get used to this as normal 911 life, or do you think something is worn out?
 
You have to learn how to drive it. Give yourself time. Be patient. Let the car come to you and try not to lift off the accelerator mid corner. Brake in a straight line and power through or accelerate through a corner.

What you’re experiencing is a shift in the weight of a rear engined car.
 
You have to learn how to drive it. Give yourself time. Be patient. Let the car come to you and try not to lift off the accelerator mid corner. Brake in a straight line and power through or accelerate through a corner.

What you’re experiencing is a shift in the weight of a rear engined car.
Thanks, getting used to it is the obvious option. I realise it's a heavy-arsed car too.
But this is all straight line stuff I'm talking about really, overtaking safely is the worrying activity at the moment.
 
Engine mounts worn would allow the engine to move around more so worth checking out.

Similarly, could be the dampers on their way out - does the same thing happen with Sports Mode / PASM set to hard? Or less pronounced?
 
Engine mounts worn would allow the engine to move around more so worth checking out.

Similarly, could be the dampers on their way out - does the same thing happen with Sports Mode / PASM set to hard? Or less pronounced?
Less pronounced in Sport mode
 
Thanks, getting used to it is the obvious option. I realise it's a heavy-arsed car too.
But this is all straight line stuff I'm talking about really, overtaking safely is the worrying activity at the moment.
I can see that you’re not enjoying the car. Best not to chuck any more parts at it and instead take it to a chassis expert like Cof G and others. They’ll be able to advise you on the best course of action but we warned, it could get expensive.
 
I can see that you’re not enjoying the car. Best not to chuck any more parts at it and instead take it to a chassis expert like Cof G and others. They’ll be able to advise you on the best course of action but we warned, it could get expensive.

I was about to say the same, take it to a suspension/geometry specialist - sounds like there's something "off" with the car.

Center Gravity
String Theory Garage
Suspension Secrets
 
Had exactly the same problem with my C4 cab, coming from a BMW 430d it was different. It also did not help that after 86k the suspension, shocks and engine mounts were all well past their best. Replaced it all, added a DSC and suspension geo and it is now fantastic. C of G is your best option at present as they will be honest as to what does and does not need replacing
 
upgrade the anti roll bars for the wobble issue
noting that worn bushes on the front control arms will also cause this

ignoring the handling issue, was the DSC controller worth it for the normal ride improvements ?
 
I can see that you’re not enjoying the car. Best not to chuck any more parts at it and instead take it to a chassis expert like Cof G and others. They’ll be able to advise you on the best course of action but we warned, it could get expensive.
Yeah, no point replacing stuff randomly. I wish some of those places were closer!
I'm due in at my indie at the end of the month so will ask them. Also see if they have one in stock I can compare with.
 
upgrade the anti roll bars for the wobble issue
noting that worn bushes on the front control arms will also cause this

ignoring the handling issue, was the DSC controller worth it for the normal ride improvements ?
Normal ride is smoother, yes. What was immediately noticeable was a roundabout at moderate speed, where I had a 'ah, that's more like it' moment.
For a softer ride, it delivers but it's a bit pricey. To improve handling (ignoring my wobble) it's a lot better.
 
I used to get a bit of a shimmy from the back end before I replaced the engine mounts. They were 17/18 years old and I haven't felt the same since getting the mounts replaced with fresh Porsche ones.
 
+1 on the fact something isn't right suspension wise - there's still dampers and trailing arms which haven't been replaced and either/both of those could be shot, as well as a number of other things. I've driven 911s that have had *most* of the suspension sorted and they have been sketchy, like you describe. My current car has been *properly* sorted and is a world apart.. Yours needs to get put up on a lift and investigated!
 
Normal ride is smoother, yes. What was immediately noticeable was a roundabout at moderate speed, where I had a 'ah, that's more like it' moment.
For a softer ride, it delivers but it's a bit pricey. To improve handling (ignoring my wobble) it's a lot better.
i have the opposite, replaced everything and the sports ride is spot on
comfort without the DSC is the issue when i need it
 
I used to get a bit of a shimmy from the back end before I replaced the engine mounts. They were 17/18 years old and I haven't felt the same since getting the mounts replaced with fresh Porsche ones.

If you don't know when the engine mounts were changed, they probably need replacing. Type911 do a good set : link Just double check with them that these ones will fit your car.

They are not expensive and are super quick to fit.
 

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