Errors while maesurements

In order to establish the accuracy of axle constructive geometry and wheel alignment, we must try to make them as smaller as possible, tolerance, deviation, measurment error and variance.

Recently I've found out a negligible uncertainty on measurements, that was the displacement of hub positions while measurements caused by the pysical phenomena of tire spot deformations.

The distance between hub center and ground becomes shorter as the time being while precise measurements leading to more datum variance.　

This phenomena is caused by the movements of supporting positions toward outside leading to more negative cambers application in relation with lever ratios on axle arms.

I didn't imagine the cause of chronic datum variability for long time and I've been suffered so much from this artifacts.

After taking measures for this by upgrade the tire pressure till the limit 3kg/square centimeter, the obtained datum reproducibility were far improved dramatically.

The measurement of the frontal cambers on BC7 SUBARU Legacy LSi US model proved negligible error on left side. The camber inclination on frontal right wheel was 37 min angle value, on the other hand left side was only 5 min under the condition of driver' s body weight was burdened on the position as shown in the photo. After the adjusting on left side camber value at 37 min same as the left value, the character of steering actions changed into more honesty one. As we take it a common sens the adjustment of frontal camber invites the camber value changing, so the measurements must be performed vertically and horizontally together at the same time. This procedure requires some experiences and skills to be carried out without errors.

After setting up the frontal axle firmly, test running found out that the left side tendency habit has been still remained.

I know why so, the additional application of negative camber must have moved the left hub position outside leading to the plus thrust angle reproduction at the same time.

This is the reason why left side tendency still remains even after the increase of frontal left negative values.

Almost of reforming procedure on VW 1302 Super Beetle have been finished, not the appearance but inside.

I'm waiting the good opportunity to bring it to Land Transport Office Hyougo for plate registration, because the the date in the season would decide the following after every 2 years Legal Inspections.