997 straight line driving

[spice]

hello all, so had the 997 carrera s for 3 weeks, i mainly drive 60 miles a day on the moterway and have had a host of cars from bentley Gt to f355, but the carrera is the only one that seems to pitch and roll at the front, almost like a cross wind is catching the car and you have to catch steering, is this a trait of the 911 ?, also on full lock at low speed there is a kind of bumping to the steering wheel, dealer tells me this is normal and is due to rims pitching ? both hands are required on the wheel at over 90mph is this normal ?

[wrn]

spice - I did not notice any of the above on either of my 997 C2Ss.

Will

[cyrus1971]

Yes normal on my 996TT but I would say over 110 mph.

C

[gmk666]

spice said:

also on full lock at low speed there is a kind of bumping to the steering wheel, dealer tells me this is normal and is due to rims pitching ?

Supposedly they all do that. Although mine only does when it turning left on full lock for some reason. It feels like either a puncture, or a nail in the tread, or the wheel's about to fall off, depending on how sensitive I am that day. I spoke to a bloke at the OPC and he talked about reprofiled castor angles or something and I just nodded until he stopped.

[Porsche GT3]

gmk666 said:

spice said: also on full lock at low speed there is a kind of bumping to the steering wheel, dealer tells me this is normal and is due to rims pitching ? Supposedly they all do that. Although mine only does when it turning left on full lock for some reason. It feels like either a puncture, or a nail in the tread, or the wheel's about to fall off, depending on how sensitive I am that day. I spoke to a bloke at the OPC and he talked about reprofiled castor angles or something and I just nodded until he stopped.

Does that on mine too! Also had it checked with OPC, normal.

>> Edited by Porsche GT3 on Thursday 13th April 18:23

[screwtape]

Same with me - The OPC said it was normal - but he would say that!

[jjr1]

spice said:

hello all, so had the 997 carrera s for 3 weeks, i mainly drive 60 miles a day on the moterway and have had a host of cars from bentley Gt to f355, but the carrera is the only one that seems to pitch and roll at the front, almost like a cross wind is catching the car and you have to catch steering, is this a trait of the 911 ?, also on full lock at low speed there is a kind of bumping to the steering wheel, dealer tells me this is normal and is due to rims pitching ? both hands are required on the wheel at over 90mph is this normal ?

I drive my 997 without suffering any pitch/roll at the front. I do have -20mm suspension so it maybe handles differently at speed but no problems anyway.

[colin5577]

It's a 911 trait - they all bob and weave at the front a fair bit. At higher speeds on motorways, what you're describing is the norm (in my experience). You'll get used to it, and though the movement may make you feel uneasy at first, ou should get used to it. If you track a 911 (993,996 or 997) there are some sections of some circuits (Brands hatch) that can really have the front end corkscrewing around. Initially its scary, but you learn to drive through it.


Then again, your car could be about to lose its' front wheels.

[spice]

well it has been bloody windy for the past three weeks, it drives a bit like my old TVR Griff , i always felt that car was trying to kill me, i will get used to it of course if thats normal, winding the thing up to 160mph was pretty scary although very rapid, thanx for the feedback

[BliarOut]

Just a thought, if it's second hand are the front's worn? You can't tell as they wear on the inside first due to the geometry of the front wheels.

[spice]

tyres were all 666 mm on the geo check and were at the right pressure, car has only done 3.5k, ride hight is front 133 back 153 19" rims,maybe car just tracks and is more sensitve, is this the sports csr steering feelback missing in all my other cars?, still the bumping on full lock dosent seem correct ?

[elfer]

I put much of that high speed stuff down to light front weight when I first got my 993. It felt very vague at Autobahn speeds compared to the front-heavy Audi S4 I ran at the same time. Best advice is don't try to fight it, just keep a light grip on the wheel and let it do it's own thing. And if it still bothers you, stop driving front engined cars then you'll stop noticing...

edit - I'm sure it's as much lot to do with camber and toe settings optimised to make the car keen to change direction as opposed to making it stable, it's just the weight distribution thing is easier for me to understand.



>> Edited by elfer on Saturday 15th April 12:32