Can you be a little more specific? What is wrong with it? I'd like to know as well since I'm having similar issues.Alignment is incorrect
no steering wheel vibrations. tho the car goes slightly to the right when iām not holding the steering wheelHere's my specs OP, although I have similar issues that you have - very floaty and steering wheel vibrations at high speed. Do you also experience any steering wheel vibration at highway speeds and above? That's an annoying issue I'm trying to resolve but so far nothing has worked. Wheel balance is fine according to discount tire and the second BMW shop I took it to to do the alignment, but there's still micro vibrations in the wheel at certain speeds that are super annoying. They are almost like pulsating vibrations - vibrate, stop, vibrate, stop, vibrate, stop.
All cars have a tiny bit of steering to the right, especially modern german cars, some say it is for safety some say other things but even my car since new has a had a slight shift to the right after letting gono steering wheel vibrations. tho the car goes slightly to the right when iām not holding the steering wheel
If you're in the right lane the vehicle will always drift to the right due to the grade sloping to the right. This is amplified with performance tires.no steering wheel vibrations. tho the car goes slightly to the right when iām not holding the steering wheel
I appreciate the detailed response, so to alleviate the "floaty" feeling, what did your mechanic dial in the alignment at? is it the .40Ā° rear toe? I'd be very interested in your spec sheet to get my car properly dialed in.It is counter-intuitive but toe-in is positive and toe-out is negative so your specs look okay.
A rwd car pushes the front tires. Rolling resistance causes the tires to push back against the suspension. So, rwd vehicles use toe-in settings to offset this movement. More toe-in will reduce oversteer and improve stability at speed. More toe-out will reduce understeer but will reduce stability and make the car feel darty. Excessive toe settings can cause the steering to feel shaky and unstable. It will also cause excessive tire wear.
Here are the OEM specs:
Front-wheel alignment:
Toe-in: Total = 0.27Ā° +/- 0.20Ā°
Camber: -1.75Ā° (+/- 0.50Ā°) with Adaptive variable suspension
Notes: Toe is adjustable. Camber is adjusted by only replacing the steering knuckle.
Rear-wheel alignment:
Toe-in: Total = 0.23Ā° +/- 0.20Ā°
Camber: -2.00Ā° (+/- 0.42Ā°) with Adaptive Variable Suspension
Notes: Toe is adjustable. Camber is adjustable.
Caster: 7.58Ā° (+/- 0.50Ā°)
Steering axis inclination: 17.35Ā°
Looks like your alignment matches factory specs with total toe front and rear at 0.22Ā° and 0.26Ā°, respectively. I also experienced the "floaty" feeling at high speeds until my alignment. My mechanic told me it's due to the adaptive suspension not fully dialled-in with the aftermarket lowering springs plus the moderate toe-in recommendations. My mechanic recommended a more aggressive toe-in for high-speed stability eg. rear toe-in at 0.40Ā° total and going with a proper coilover setup.
I'm definitely leaning towards floaty. feels like I make a steering adjustment, front end reacts, then the rear end reacts. once I'm in the turn the car feels stable but coming out of the turn if feels unstable again. this feeling is only at ~60mph and higher.YOu need to be able to tell the difference between floaty and darty.
Floaty is probably something in the rear. darty is too aggressive/track set up in front.
Your alignment is set close to factory specs. Keep in mind the specs references total toe-in, not each side. So total toe-in of 0.23 would represent 0.125 each side. If you want more straight line stability add slightly more toe-in on the rears. Ive seen some members with 0.20 toe-in each side.I appreciate the detailed response, so to alleviate the "floaty" feeling, what did your mechanic dial in the alignment at? is it the .40Ā° rear toe? I'd be very interested in your spec sheet to get my car properly dialed in.
Also, what is your tire setup? anything changed on your suspension also?
If you upgraded the rears to 305, did you upgrade the fronts? If not, that may be your clue.I'm definitely leaning towards floaty. feels like I make a steering adjustment, front end reacts, then the rear end reacts. once I'm in the turn the car feels stable but coming out of the turn if feels unstable again. this feeling is only at ~60mph and higher.