Quote Originally Posted by speedminded
You can't use lasers on just the front or rear wheels can you? It has to be on all 4 otherwise there is no way it can determine anything -- the front is aligned to the rear and the rear is aligned to the front...it's a triangle effect between the computer, front, & rear...if you take one of the variables out how is it to know what is aligned and what isn't? With all 4 laser setups on the wheels the computer/software is going assume that the front and rear wheels are the same because it doesn't know any different then it's going to try to compensate that difference in offset with toe adjustments but it can't because left side to right side wouldn't be parallel...
He's right. Im a tech for acura and the alignment rack works with all four wheels as a whole. If the front and rear are different from each other in anyway its not going to align properly. Its the same as if you put one wrong size tire on the car, its not gonna be right. Yes it will compensate and it might even so you the numbers you want to see, but that doesnt mean they are actually correct. Alignments are very sensitive and can be offset by something as simple as tire pressure. BTW if your suspension is stock the only thing adjustable on it anyway is toe.