Wrench Tip: How to Do Your Own Alignment!
The last step is to make sure that the strings are perfectly parallel to the centerline of the car. We do this by moving the bars left or right until the distance from the string to the wheel hub on adjacent wheels is equal. It’s important to remember that the distance does not have to be equal between the front and rear wheels, as your track width may be different. You only need to match the distance on the front wheels, and the rear wheels.
I usually measure from my wheel center caps to the string. However, if you believe that your control arm lengths are unequal from left to right, or your camber is not symmetrical, then the center caps may not be an accurate reference. In that case, you may have to measure from the string to the frame rails by sticking the tape through the spokes or something (although if your control arms are unequal, it’s usually because your frame rail is twisted, so that may not be a good reference point either).

Be very careful when adjusting the bars, as it’s very easy for them to be knocked over. I usually just lightly tap the ends with my fingers to move them left or right. After you’re done adjusting them left to right, I also recommend you recheck the front to back distance, as it may have been thrown off slightly.

Now that the strings are square, we can measure the toe. Simply measure the distance from the string to the front and back of the lip. The difference is your toe. Just don’t get confused with whether you have toe in or toe out. In this picture, you can see that the front the lip measured smaller than the rear of the lip. This means I have toe out, 4/16” or 2/8” toe out to be exact.
Pro tip: turn on your underglow to help you see in the dark when making adjustments.
Don’t forget to center your wheel before taking measurements! Also make sure that you recenter it every time you adjust the toe, as it tends to move the wheel a little bit.

I’ve had success with my alignment methods, however let’s discuss the disadvantages and advantages compared the alignment methods offered by the purpose made tools I mentioned in the beginning of the article.

Watkins SmartStrings offer one distinct advantage over my string setup. They are mounted directly to the chassis, instead of resting on the floor like my setup. This means that you can move the car around and jack it up without throwing off your string setup. The downside of this, is that it relies on your chassis sheet metal being straight. This may cause issues, especially with drift cars where 90% of the time the core support is twisted and the trunk has been on a few drunken dates with the wall.

My camber gauge setup (the angle finder one) is on par with most camber gauges I’ve seen. The only difference is that you have to use the bubble level to ensure that the plane that you are measuring the camber in is perfectly perpendicular to the ground. Most digital camber gauges have that feature built in.

As far as the turn plates go, my turn plates have a huge advantage compared most other turn plates, simply because they double as slip plates. In fact, the only turn plates I’ve seen which also function as slip plates, are made by Longacre and cost $700, FOR TWO. Granted, these things probably have a lot less friction than my slippery tile, but I can slide my whole car sideways if I push on my bashbar, so I would consider that good enough. The one disadvantage that my tile has over most turn plates however, is that it can slip at high turn angles.

In the end, the accuracy of your alignment depends entirely on your meticulousness. If you take the time to make sure all your references are setup correctly, you can achieve extreme accuracy, even with the most basic tools. Achieving perfection can be a bit time consuming, but it’s definitely worth it. It usually takes me 4 hours to do a full front caster->camber->toe and rear camber->toe alignment. Of course there are a ton of other variables which affect your alignment, such as tension rod length, king pin inclination, lower control arm length, ride height and many more, but all them require special techniques to configure. Keep an eye out for future articles addressing some of these.

10 comments

  1. Thanks for the guide but I have a problem.

    I entered your shortened caster formula in Microsoft Excel, and got a totally different value.

    =ATAN((SIN(RADIANS(B64))-SIN(RADIANS(C64)))/(2*SIN(RADIANS(B65)))
    =0.05481679
    Instead of 4.2

    1. ATAN in excel returns the result in radians by default. Convert it to degrees by changing your formula to =DEGREES(ATAN((SIN(RADIANS(B64))-SIN(RADIANS(C64)))/(2*SIN(RADIANS(B65))))

  2. Great article and a very clear explanation of the string method for alignment but one query. You stress the importance of the bars being parallel to each other but presumably they don’t actually have to be square to the car – making a parallelogram out of the string and the bars is sufficient and they don’t have to make a rectangle. Would you agree?

    1. This is correct, a perfect rectangle isn’t necessary. An isosceles trapezoid or parallelogram is okay. In either case, the string is spaced evenly from the hub cap on each side.

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