Geometry Reports

[Tony]

There is a real problem regarding the workmanship correcting the Geometry and the final report you receive. That report permits you to view the workmanship but it's complicated to understand since the figures represent positions and forces, with luck this thread will help.

 

Problem number one is the software. Once the car is measured the screen will display any angle out of specification as red, as the angle is adjusted the figures will turn green once it reaches the 'Specified range' this is wrong! and i have argued this fact directly at the manufacturers. What should happen is the figures should be displayed red when out of range, then yellow in the specified range and green at the target area/setting.

 

To the print

 

 

This particular car was pulling left, by email i asked the owner to have the Geometry measured, he did and was told nothing was wrong..... but there is...

 

with the front camber... have another look!

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What the technician failed to see because the camber is within the 'Specified range' and green is that the positions are in conflict

NSF: 18' Positive so the compression is outside of the car

OSF: 24' Negative so the compression in inside of the car

In all 42' of push to the kerb.... imagine the vertical looking like this \ \ hence the pull.

 

Problem number two. The specified range is the mechanical dynamics of the suspension when in motion taking all possible extremes of compression and release, but in truth this has 'NO RELEVANCE' to the information needed during a Geometry. If you are a mechanical engineer it may be of interest but other than that?

 

To read the final positions try this... The actual position for all angles is the absolute centre of the specified range, in this example Camber front -50' to +40' the static centre is -10' for each front wheel.

 

The complaint was the disparity in the front cambers, the failure was the software and the knowledge of the operator. My advice to you is look for the exact centre of the specified range. Also on this print there is another problem, not part of the complaint but it will become a future issue.... taking this lesson into account have a look at the rear Camber positions.

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Alarmingly the positions would be seen as green but the tyres will be worn to the wire in no time..

 

To reiterate..... The shop said there was no problem with the Geometry, it cost him £60. If it wasn't for wim's intervention he avoided a long expensive path to find a solution.