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YOUR RESEARCHHigh Speed Stability?
Reported or suspected cause
suspension bushings were the issue, in addition
Reported cause
No successful repair reported for this finding.
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Reported cause
It turned out that the old suspension bushings were the issue, in addition to some play in the front wheel bearings.
Leading evidence: 'suspension bushings were the issue, in addition' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'suspension bushings were the issue, in addition' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust tire pressure' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
I adjusted my tire pressure to owner manual specs.
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Performed · outcome unconfirmed
I checked my tires and they are 32 all the way around.
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Suspected cause
If it just vibrates a lot, I'd suspect tire balance or possibly wheel bearings.
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Suspected cause
If it feels unstable, like it doesn't want to go straight, I'd suspect worn suspension parts and/or a bad alignment.
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Being new to the 911, my car doesn't feel as stable at high speeds as I would have thought. I'm coming from a 08 VW R32. That car felt planted at speeds over 80 MPH, and up to 120 MPH. My Targa doesn't seem to feel as planted at the R32. I would think the opposite would have been the case. At speeds over 80 MPH to 120 MPH, it feels like my car has a very subtle correct, over correct going on. Really seems to tramline more as well. I was thinking of taking it in for an alignment, however before I spend the $300 for the alignment, I was wondering if there was anything else I can look at? Pretty new Continental Extreme Contact DW tires, the PPI showed the suspension was in good shape. Probably possible there are some worn suspension bushings although the steering and suspension feel very tight.
I'm not a fan of these tires though and I think they may have a little to do with it. I had a set of the Continental Extreme Contact DW's on my R32. Hated them. Car was not near as stable and planted. I traded them for the Extreme Contact DWS's and it was a whole different car.
Now, just a disclaimer. Of course I'm only going these speeds on the track. I would never knowingly break the law.
Something is definitley wrong.
Check wheel bearings, bushings.
Check wheel balance then alignment.
Your car should be stable and predictable at the speeds mentioned
I find at "speed" (were not talking stupid speed here) its fantastic - when you let off the throttle that's when it doesn't feel
as
stable - that's my take anyway
Sadly, I felt the same way about my ‘99 911 when I bought it about 3 years ago. Very unstable speeds over 80mph. Got a lot of good advice from friends, it made a huge difference. Everyone’s path maybe different, but here is what I ended up doing...
1). New Tires (switched from Pirellis to Hankooks, and yes these cars are very sensitive to tires and tire pressure)
2). Rear toe control arms (check Tarett and others), the parts are like magic in my opinion
3). More aggressive alignment (I can send you the specs if you want, made a big difference)
I did all 3 of these at once, so not really able to pin down the root of the issue.
If it feels unstable, like it doesn't want to go straight, I'd suspect worn suspension parts and/or a bad alignment. If all your suspension is original, even if it looks good it's likely some stuff is worn out and has too much play. Get everything in good shape before bothering to align it.
If it just vibrates a lot, I'd suspect tire balance or possibly wheel bearings.
If it feels "mushy", imprecise, but overall pretty stable and cushy, that's those Continental DW tires.
My 99 felt fine at normal road speeds. When I first took it out on the track, it felt like it wanted to wander, especially in the rear. It turned out that the old suspension bushings were the issue, in addition to some play in the front wheel bearings. I had it all replaced and it made a world of difference.
Yes, that seems to work for me for street driving. Again 35ish hot is the goal. For the track, no more than 36 hot is my target, so depending on the track/weather, the rears need to start at 1 or 2 psi different than the front.
FWIW -- tramlining was a big issue with my friend's 2001 C2 coupe. Just a few pounds below the Porsche-recommended pressures made a huge difference.
I recommend you start by using the exact pressures recommended by Porsche. For an '02 C2 cab that's 36 front, 44 rear (with the 18" diameter wheel option). Then alignment. Then badly worn suspension parts. And tires.
What I found is that the stock US suspension yielded a "floaty" front end at track-only speeds. I eventually swapped out the stock suspension for the M030 RoW (Rest of World) suspension, which completely solved that issue. The car is now planted at any track-only speed I care to run.
All good points here. I found 34 front and 40 rear worked for 3300 lb operating weight. Check your tire wear line against the wear mark arrows. It does sound like tire pressure and alignment check will get you closer to your desired stability.
I have the same kind of issue. I read on a dif thread one reason it does not feel,planted. Heck my company car impala feels more planted at 90 is that the engine is in the back. The lack of weight on the front axel is missing. I think mine wants to wander but at 90-100 I let go of the steering wheel and it drives straight. It just feels light. I don’t want to have to do high speed maneuvers lol. I will take a look at ides listed above. Thoughts on the lack of engine weight up front?
worn thrust arm bushings and/or toe is off... you can run fairly aggressive alignment settings and still feel stable at the end of the speedometer, but hit a certain point with toe/bushing flex and it becomes jittery very quick
I adjusted my tire pressure to owner manual specs. 36/44. It did provide some improvement. Put my car up on my lift. No wheel play so I don't think there are any issues with the wheel bearings. I realize bushings aren't easy to diagnose without removing them. I'll continue looking into some of the great tips offered.
High tire pressure will do that. Try 30/35 cold.
Mine is awd and I think that makes a big difference. Can go between 85-100 really stable even wet...its as if you�re going 60. My rwd boxster would have lots of drama.
911s have lighter fronts and handling is kinda �backwards dart� at speed. More power straightens you out. Its not the kind of car you feather the power...
Boy, there is still lots I am learning. I checked my tires and they are 32 all the way around. 44 seems really high. I am assuming it’s 44 cold. How does it affect the handling. I am trying to have it make sense.
44 cold is WAY too high. How it affects handling is to make it turn to crap. We refer to the feeling as "greasy" on the track. Your car should feel stable to 150 at the very least.
There are handling trade-offs with different pressures. Comfort vs performance. For example, when tracking I shoot for 32 hot. This may mean starting at 26 or 27 cold.
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