BRZ not stable at highway speeds
 

I recently bought a '16 BRZ Limited in early March. Today was one of the first days I really got to drive it more than 20 miles on open highway and not to the dealership.

At 500 miles, my alignment was out, they fixed the rear toe and everything now is in spec. 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.

Around a slight right bend on the highway, the car literally went half way into another lane.

Had the alignment checked elsewhere, still in spec. I even looked under the car and found nothing out of the ordinary.

Now I know the car is light and it was a bit windy, but I never felt unsafe driving a new car. My C5 vette will handle these slight bends like nothing even in tornado storm weather. Granted it has a much lower COG, wider tires, and beefier suspension.

I'm wondering if this is normal for the BRZ, or if lowering it and having wider tires will help. Or is there something actually wrong with the vehicle.

what is "within spec" that the alignment people are telling you? do you know the numbers? sounds like you have a problem with the toe to me. I'm assuming your car is stock, and the "stock" alignment has a wide range that can be considered within spec.

Show the alignment print out. Within spec may still have variances. Example the spec can be -.08 and .08 and you can be sitting at both extreme ranges per side.

Been to 127mph and it felt very solid. I suspect misalignment. I would have it checked by a different shop.

makes two of us. even after I slammed my twin running around -5 to -6 camber all the way around it felt stable at 120mph and i was driving without an alignment at the time. Just put the coils lcas and all that and drove around till the next paycheck. never had my car pull to a side unless its windy out

OP sounds like a one off issue or whoever did your alignment missed something.

14 hours a week spent on the highway and it takes curves like it is on rails. There is something not right.

^Yup, get the exact specs from them.

I did over 600 miles yesterday from the northern NY 'burbs to within 75 miles of the Canuckistanian border in northern NH and back, interstates and back roads in all sorts of weather at all sorts of speeds and not a problem with stock tires that have ~40,000 miles on them. There is something not right with your car.

ps: ooh I had my best mpg tank ever at 34 with an avg speed a little over 70mph :)

misalignment or defective tires.

They screwed something up or something is defective on your car. I routinely cruise at 100mph+ and my BRZ is laser straight and stable. I have wide sticky tires too so I'm putting more load on the steering and suspension.

Hood starts to wiggle, sure, but tracks perfect.

I am curious if it was extreme wind (but sounds like you took that into account).

Were there grooves in the pavement? I know on my motorcycles that can make my bike shake.

And the obvious most likely answer...something is just wrong with suspension bits (all the stuff people above me mentioned).

I am not super-mechanic or anything...could it be something wrong with the steering wheel/column and that set up?

^^ One thing in that article bugs me. It says new tires always go on the rear. I've always done exactly the opposite, if I'm only replacing two they go on the front.

Our cars are sensitive to the wind at highway speeds.....well mine is anyway. However, I honestly don't mind it or feel unsafe. I love the feel and handling of this car. I am sorry if you are not satisfied with your purchase.