[sauceonside]

I replaced my LCAs with the M version last week (did not do Tension Struts). Afterwards, had the car aligned. My indy did the alignment; although I don't have the specs, he said he adjusted the rear toe conservatively.

On the plus side, the car absolutely loves to turn--canyons are fantastic and the camber is very perceptible.

However, I'm having some cons at straightline highway speeds. At 70+ the car requires constant corrections to stay straight; it's seemingly always moving to one way or the other. It's not pulling--drifting seems more accurate. It's manageable but annoying. The higher the speed, the more noticeable it becomes. Previously, highway straightline tracking was fantastic. Tire pressure is 35/39 for stock sized 225/245 tires.

Is this expected behavior from the added camber I just need to accept as a tradeoff? Or could further alignment adjustments or suspension parts make a difference?

[aerobod]

Higher camber and lower toe or toe-out (front or rear) will cause that. Car will feel nervous but responsive. The original alignment spec is more designed for straight line stability vs turn-in response.

[dradernh]

Originally Posted by sauceonside

I'm having some cons at straightline highway speeds. At 70+ the car requires constant corrections to stay straight; it's seemingly always moving to one way or the other. It's not pulling--drifting seems more accurate. It's manageable but annoying. The higher the speed, the more noticeable it becomes. Previously, highway straightline tracking was fantastic. Tire pressure is 35/39 for stock sized 225/245 tires.

If it helps, below is the alignment on my 2017 M240i MT. It hasn't exhibited the behavior you're experiencing, whether at 35/39 on 225/245 PSS / A/S 3+ and 225/225 X-Ice Xi3, or at 35/35 (hot) on 255/255 R888R track tires.