Quote:
Originally Posted by ToySub1946
from unplugged: "Now at 628 miles, cruising around 70-75mph (yes within speed limits) my car will literally shift left or right and it doesn't matter which lance since I know the road crown can give a slight pull."
I have a 2015 FRS bought new. I felt the same sensation when my car was new. It was an odd sensation surely. It was not as though the car was wandering, it was as though the entire car was shifting, just slightly, to the left or right in my lane (and constant at freeway speeds). Over a period of miles (can't recall how many...but I'd guess well over 1000 miles) this went away. I believe it was because the tires were new, possibly those little nipples on the surface of the tire left from the molding process. Eventually those nipples wear away...or simply that the tires broke themselves in. (My car came with the Michelin tires.)
>>So I'd say, put more miles on the car, and the problem will heal itself.<<
My advise: Give the car plenty of time to break itself in, and you getting used to what to expect from the car. Don't monkey with more alignment advise, changing tires or suspension pieces right now. Give it time and many more miles first.
As for this: "Around a slight right bend on the highway, the car literally went half way into another lane." I have no answer, as I was not in the car with you. You might want to dismiss this as a fluke, if it never seems to happen again. Possibly a huge gust of wind as you rounded a curve ?
Edit:I see now you've got a C5 Vette, so you quite possibly are already aware of things I've stated below...which may be similar to BRZ
Since this model car is lower to the ground than most other cars, we feel sensations we would not feel if the car were raised off the ground more. You'll also note: Can't tell exactly where the front of the car is when attempting to park up to a parking stop (cement strip). You also won't get the advance viewing notice of holes (potholes) in a road's surface you'd get in other cars. You'll have to be very careful entering or exiting into or out of a business entrance from a highway. Can't easily see just where the curb ends and entrance begins...you're too low to see these things. These are some of the tradeoffs of a car which can handle corners better than most other cars.
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I'm very familiar with rear wheel drive cars. And having had a higher HP/tq car too which sits lower than my BRZ, it still behaves very well on highway at those speeds.
I left my print out at the dealer so I'm going back this week. It looks like the toe in the rear is fighting between left and right. When applying throttle, it's more noticeable than without. Although it could also be the tires.
I did drive it again at night without the heavy gusts of wind, and it wasn't as bad as during the day. So that definitely played a part in my experience.
I'll follow up later this week with more updates.