There is one thing to remember. Setting your front end geometry with lasers will not cure your driving problems.
You can do everything you expect the lasers to do with a measuring tape and a spirit level for approximately £200 cheaper.
Secondly, setting up your front end will only work if the problem is related to the front end. If you are asking how caster / camber etc work, then the probability is that the biggest problem is the driver. The misapplication of power or brakes has more potential to produce poor times than setting up the front end accurately.
Thirdly, you need to understand the test procedure. There is no point in testing if you cannot reproduce lap times consistently, with about 0.2 of a second.
This doesn't mean you have to be super good, the easiest way to do it is to drive within your limits, say aim at about 80% of your current "absolute limit". You want to be able the driver to analyse what it felt like before and after the change. If the driver is concentrating on "flat out, limit of grip, wee in the seat" moments then they aren't going to be analysing the effects.
Lastly, you have to know what you are trying to achieve and why what you are doing might achieve it. For example, if you have over-steer, it can be because you are positioned wrongly on the track you are turning in too savagely you are too early on the power you are too heavy on the power you are too early on the brakes you are too late on the brakes you are turning while decelerating or your front end geometry could be set up better.
Hence, the £200 you save on using a tape measure can be spent on track time, curing the other 7 faults.
There are advantages to using lasers in setting up and recording your settings, but many people spend a lot of time chasing the magic bullet of 'perfect set-up' when the problem is actually driving technique and trying to cure or mask bad driving habits with 'technology".
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