I think the revised standard spec from Alfa for front toe is 0mm. Adding toe will result in increased tyre wear, regardless of lowered or standard height. If you correct camber and add toe, you will still get increased tyre wear. Generally, camber has little or no effect on tyre wear.
That's not to say correcting the camber isn't a good idea, just beware that it will not solve a tyre wear issue by itself. I agree that there is a loss of sharpness to the steering when you go from some toe to no toe.
If I read the alignment printout correctly, your car only had just over 2 deg of negative camber to begin with, so that's not really excessive, and only slightly over the spec of 1.5 deg.
Also - one of my 156's is lowered and does not wear front tyres excessively - toe set to 0. My other one is std height but previous owner had it set to 2mm toe out, so front tyre wear was high. I had it corrected to 0mm toe and tyre wear is now normal.
I do not completely agree with you!
Excessive tire wear is (apart from way of driving, tire pressure and type of tire) always influenced by wheel alignment!
Negative camber, results is more grip while cornering, this is of course pleased! Alfa made the 156 with more camber than its competitors. To have maximum joy (read precision) in steering, a FFWD car needs to have toe out on front axle!
The combination of toe out and negative camber result in steering precision and lots of grip while cornering, the price you pay is huge tire wear on the inside of your tires!
Negative camber always results in more tire wear (on the inside) especially when you align toe out!
Alfa gifs a spec of -3 up to + 3 min per wheel toe for sport chassis (lowered -25mm) . This is already a compromise between tire wear and steering. Non sport chassis is -2 , upto -10, so toe out! (toe is given in minutes, per wheel).
That’s why a GTA upright is different! Less camber while also approx. 25mm lowered! Spec on aliment
- 1, up to -7 (so just toe out!).
So if you have problem with excessive tire wear ( inside) and have a lowered Alfa 147, 156 or GT and more than 1.5 degree camber this can help you gain steering precision and get rid off excessive tire wear on the inside!
When you are having your Alfa aligned, Let them shift the sub frame so that the differences on camber and caster between left and right are being equalized.
(Ok if you only corner, so drive your Alfa just for fun, it could happen you will have more tire wear on the outside, but if you commute and drive a lot of straight lines like high way, you tires will wear more (inside) with toe out and negative camber!)