Mlaudisa

Hi, I recently bought a new 2015 RS5 which I'm very happy with. However, when accelerating hard on a straight to pass another vehicle, when turning the steering left to overtake, and then turning right to return onto the lane, I feel slight but firm tugging on the steering wheel and the car gets a little unsettled. This happens on smooth pavement and I don't believe it's the result of ruts on the road, but it feels that way.

Is this a result of the Quattro system generating some torque on the front wheels? I don't notice it in any other circumstance.... Thanks for any suggestions.

superswiss

There are a few things going on in the RS5 that can lead to this sensation. First one is the wide grippy front tires that have a tendency to hook up on every groove in the pavement. Second, the torque vectoring on the front axle that shifts torque left to right depending on where it's needed. This happens primarily when steering/cornering. An additional steering torque is generated by applying a braking torque to the inner front and rear wheels. The third one is the undesired torsional flex in the subframe of this platform that leads to incorrect steering response. The last one is most likely what you are feeling and the good news is that it is easily rectified by replacing the factory subframe brace with the Alu Kreuz from Eurocode.

Mlaudisa

Thank you for the detailed explanation, you are the second person to suggest Alu Kreuz... Will it void the warranty and how difficult a job is it to install? Thanks again

superswiss

No it won't void the warranty. It's a very easy install. Bolts right on in place of the factory brace. About a 30 minute job.

jwr9152

Your alignment and tire pressure can effect it also. Too much camber or toe will cause tramlining. Too high tire pressure will as well. Wider wheels and stickier tires give the same affect.