Unstable at speed
04-08-2020, 06:06 PM
#61
Hi. Looking for some help. Have a C2S that has done about 3k miles. Bought at Xmas used with 500 miles from Porsche. When driving at speed say 90mph and above I find the car wanders alot around the road. It never feels planted and I have to make steering corrections all the time even though the road is good condition, no real wind and rough 20c weather. I cant pinpoint it but my driving experience tells me something is just not right. Have Goodyear tyres set at 33/38 cold pressure. I did think maybe the tyres are the wrong way round but from reading they are Asymetric and as long as the "wriitng" is on the outside then they can be put on car on either side. Checked for tyre damage and none observed. Could it be alignment? Searched for toe and camber Porsche settings but cant find on this forum. Will take it to tyre centre but wanted to be armed with correct toe and camber values so I can check their work. Is there anything else anyone can think of that needs checking that could produce the symptoms. Appreciate any advice from this great community..
Once I got off the highways and onto pristine back roads leading up to the track, however, the car redeemed itself. On track it came alive even more,
but I dreaded the highway ride home. Turned out that I could not warm up to it enough to keep, so I ended up selling the car a few thousand miles later and picking up a base Panamera (best daily car I’ve ever driven, I’ve driven lots) and M4 ZCP manual, my all around track weapon.
Last edited by pawnstar; 04-08-2020 at 06:29 PM.
04-08-2020, 07:09 PM
#62
As a cyclist, perhaps there is an analogy to be made here... A bike made for a race like a crit (think lots of turns, crowded field) has a very short wheelbase and rake/steering geometry that allows the bike to be nimble and instantly change direction. To the uninitiated that bike would be hard to ride and feel 'nervous' and unstable, constantly wanting to turn. A bike for long road races would feel more stable because it is designed to be, with a longer wheelbase and different fork/steering geometry.
Maybe I'm overthinking here, and I've got a feeling alignment issues are in play (because I've never felt the 911 to be squirrely at speed), but this IS a short wheelbase car designed and optimized for the twisty turnies (vs. something like a Panamera or RS7).
Maybe I'm overthinking here, and I've got a feeling alignment issues are in play (because I've never felt the 911 to be squirrely at speed), but this IS a short wheelbase car designed and optimized for the twisty turnies (vs. something like a Panamera or RS7).
04-09-2020, 01:08 AM
#63
04-09-2020, 03:57 AM
#64
Advanced
Thread Starter
04-15-2020, 09:32 AM
#67
Advanced
Thread Starter
04-16-2020, 02:43 AM
#70
Three Wheelin'
There is a difference between high speed wandering/vibration and having to pay attention to driving the car. I have an S550 and at 100mph it just sits on the road with one finger on the steering. The 911 is stable at very high speed but you have to pay attention and constantly drive the car. The steering/tire combination can follow irregularities in the pavement and even small potholes can cause a small deflection in the steering. The old air cooled bump steering is long gone, but the 911 is still a driver's car and demands engagement. Now steering wheel vibrations or brake pulling to one side is a different issue. Alignment and tire pressures are first things to check as others have stated.
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SamD (04-16-2020)