Rear toe in effect

[B100]

I went in for an alignment and the both front toe were reset to 0 (middle of the recommended range) but both rear toe were set to 0.03º (the recommended range is 0.03º to 0.19º). Camber/caster were all in the recommended range for all wheels.

What's the effect of not enough toe-in in the back for a FWD car?

 

[StarCaller]

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[Cujet]

I went in for an alignment and the both front toe was reset to 0 (middle of the recommended range) but both rear toe were set to 0.03º (the recommended range is 0.03º to 0.19º). Camber/caster are all in the recommended range for all wheels.

What's the effect of not enough toe-in in the back for a FWD car?

In the range that you are talking about, there will be no difference what so ever, being close to zero is generally a very good thing. In general, a tiny touch of rear toe in is helpful under hard braking to maintain solid stability by preventing toe out during braking.

As you probably know, excessive toe in/out will cause tire wear, drag and eventual tread noise problems.

Also in general, a small amount of toe in is associated with more stability
Toe out is associated with a wandering/darty/or less stable feel.

Most of us old race car guys have driven a car that just won't stay in it's lane. Or tends to wander up and over the tire tracks (ruts or depressions) on older roads. That's typically an overt toe out situation, either front or rear.

Also of note, if you want to run tons of negative camber for track days, a bit more toe in may help reduce or prevent rapid inner tire tread wear on your street driven car.

 

[B100]

In the range that you are talking about, there will be no difference what so ever, being close to zero is generally a very good thing. In general, a tiny touch of rear toe in is helpful under hard braking to maintain solid stability by preventing toe out during braking.

As you probably know, excessive toe in/out will cause tire wear, drag and eventual tread noise problems.

Also in general, a small amount of toe in is associated with more stability
Toe out is associated with a wandering/darty/or less stable feel.

Most of us old race car guys have driven a car that just won't stay in it's lane. Or tends to wander up and over the tire tracks (ruts or depressions) on older roads. That's typically an overt toe out situation, either front or rear.

Also of note, if you want to run tons of negative camber for track days, a bit more toe in may help reduce or prevent rapid inner tire tread wear on your street driven car.

Yeah, I felt it's easy to tell when the front toe got corrected - turning the steering wheel at low speeds require much less effort when the front toe is neutral. Rear toe I think it's harder to tell the difference when the car is tracking straight.