Discussion
Just posted this on the technical forum but thought I'd give the Wedgers a go too.
Jon
Following the PAS conversion on my Tasmin I need to get the tracking checked.
I have the track and toe in measurements in mm but all the local tyre shops and garages want the values in degrees. I think I can work this out ok but I need a couple of points of confirmation first.
The tracking figure quoted in the manual is 1436mm with a toe in of 3.2mm
I asume the tracking relates to the center line of the wheel (axle center line as shown on diagram)
Therefore with a toe in of 3.2mm the front line A on the diagram will be 1432.8mm from wheel rim to wheel rim and line B will therefore be 1439.2.
Is this correct?
With this info I can then use a bit of triganomety to work out he angle of the wheel relative to a straight line drawn front to back of the car. Hooray for maths
Jon
Following the PAS conversion on my Tasmin I need to get the tracking checked.
I have the track and toe in measurements in mm but all the local tyre shops and garages want the values in degrees. I think I can work this out ok but I need a couple of points of confirmation first.
The tracking figure quoted in the manual is 1436mm with a toe in of 3.2mm
I asume the tracking relates to the center line of the wheel (axle center line as shown on diagram)
Therefore with a toe in of 3.2mm the front line A on the diagram will be 1432.8mm from wheel rim to wheel rim and line B will therefore be 1439.2.
Is this correct?
With this info I can then use a bit of triganomety to work out he angle of the wheel relative to a straight line drawn front to back of the car. Hooray for maths
Right I'm back now.
I assume that your 3.2mm is intended as a difference measurement between the wheel rims front to back. As such you need to know the rim diameter to correctly calculate the angle. The track dimension is only of incidental interest.
Angle=ArcTan(Opposite/Adjacent) where Adjacent=Rim Diameter.
15 inch rims 3.2mm toe gives 0.24 degrees wheel to vehicle center-line or 0.48 degrees wheel to wheel.
14 inch rims 3.2mm toe gives 0.26 degrees wheel to vehicle center-line or 0.52 degrees wheel to wheel.
Years ago I was getting the 350 tracked when the "technician" asked if it was a Lotus This inspired such confidence that I phoned Wedge Automotive (now RT) for the correct settings, he said 2mm.
Note the assumptions above as it makes quite a difference if it is a measurement from the vehicle center-line or to the tyre edge instead of the rim. I've never had a definitive answer to this and suspect that different people refer to different methods randomly!
Also a very quick tape measure of the track (outside edges of wheels) on my 350 came up with 1670mm which is quite a difference to 1436mm! What's going on there?
Hope that helps some.
Leo
I assume that your 3.2mm is intended as a difference measurement between the wheel rims front to back. As such you need to know the rim diameter to correctly calculate the angle. The track dimension is only of incidental interest.
Angle=ArcTan(Opposite/Adjacent) where Adjacent=Rim Diameter.
15 inch rims 3.2mm toe gives 0.24 degrees wheel to vehicle center-line or 0.48 degrees wheel to wheel.
14 inch rims 3.2mm toe gives 0.26 degrees wheel to vehicle center-line or 0.52 degrees wheel to wheel.
Years ago I was getting the 350 tracked when the "technician" asked if it was a Lotus This inspired such confidence that I phoned Wedge Automotive (now RT) for the correct settings, he said 2mm.
Note the assumptions above as it makes quite a difference if it is a measurement from the vehicle center-line or to the tyre edge instead of the rim. I've never had a definitive answer to this and suspect that different people refer to different methods randomly!
Also a very quick tape measure of the track (outside edges of wheels) on my 350 came up with 1670mm which is quite a difference to 1436mm! What's going on there?
Hope that helps some.
Leo
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