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Motorsport Wheel Alignment: Step 3: Check Base Alignment

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Step 3: Check Base Alignment

01.57

00:00 - Step 3 is to record the current settings of the car.
00:03 In motorsport this is often what's referred to as a set down.
00:06 The opposite of a set up.
00:08 If you aren't setting the car up from scratch for the first time, then this gives you a way of recording the final setup we ended up with the last time we ran the car.
00:15 This is an important step in getting the most out of the car and understanding your setup.
00:20 First thing to check is the caster.
00:23 Start by removing the strings so that they don't get in the way.
00:25 With the steering unlocked temporarily and with the steering wheel centred, make sure that the toe plates read zero.
00:32 Here we're using this adjustable frame which makes it simple to attach our caster gauge to the wheel.
00:37 Starting with the front right, we can turn the steering wheel to the right by 20°, using our toe plates to guide us.
00:42 Looking at our caster gauge, use a small level at its base to get it sitting flat.
00:46 Then we use the thumb wheel to zero the caster vial.
00:50 Go back to the steering wheel and rotate 40° to the left which will result in the wheels pointing 20° to the left from straight ahead.
00:57 Use the caster gauge again, making sure that it's sitting flat and read off the caster value.
01:01 Repeat this process for both front wheels and record our caster readings.
01:06 Here the caster values were 2.5° on both the front left and the front right.
01:11 Relock the steering straight ahead and fit the strings back to the bars.
01:15 Taking care to make sure that they are still centred on the chassis.
01:18 Now we can make use of our camber gauge and move around the car, recording the values as we go.
01:24 We measured -2.7° in the front left, -2.3° front right, -2.7 left rear and -2.3 right rear.
01:33 Now we can use a steel ruler to measure our toe settings with our string box as the reference.
01:37 The current settings are 6 mm toe in left front, 2 mm toe out right front, 1 mm toe out left rear and 0 mm toe right rear.
01:47 Make sure you record these values as you go so you can refer back to them in the future as required.