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Cornering Optimizing your suspension system. |
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Okay, geometry problem for you guys. How do you convert toe inches to toe degrees, and vice versa?
I'm thinkering with this trapezoid calculator, and I think I'm headed in the right direction: http://www.1728.com/quadtrap.htm For overall tire diameter, I'm using 205/45-17 (stock 17"), so for sides b and d, I'm using 20.6". Sides c and a represent measurements taken between the front of a toe plate (a flat plate that sits against the outside of the tire) and the rear of the toe plate, respectively. For c and a, so long as the angles are not extreme, the actual length doesn't matter, moreso just the difference between the two measurements. |
#2
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Ooo, I can figure this out, gimme a min.
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#3
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Okay, so given a 205/45-17 tire, it looks like it works out to this:
1/8" = 0.348 degrees (total, so 0.174 degrees per side) 7/64" = 0.304 degrees (0.152 per side) 3/32 = 0.26 degrees (0.13 per side) 5/64 = 0.218 degrees (0.109 per side) 1/16" = 0.174 degrees (0.87 per side) 3/64" = 0.13 degrees (0.065 per side) 1/32" = 0.087 degrees (0.0435 per side) 1/64" = 0.0435 degrees (0.02175 per side) I'll continue adding more conversions as I calculate them. Last edited by iDiaz; 04-26-2007 at 06:30 PM.. |
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i was thinking triangles and came across this in a quick search:
http://www.mentorsoftwareinc.com/cc/...s/TIPS0699.HTM |
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#6
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this theorem youre building... wouldnt it be better to use the rim instead of the tire as a measuring point? i'd think that inconsistencies of a tire would hinder the exactness of the measurements.
also, question in regards to measurements of toe... when toe is set to be 1/8" out is that a reference to 1/8" away from the original position? i.e.- 0.348 degrees from 0? |
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#9
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OK, someone correct me if I'm wrong but:
The angle should just be tan (diameter of wheel / amount of toe) And the amount of toe should be arctan (angle) = radius of wheel / amount of toe so: amount of toe = diameter of wheel / arctan (angle) |
#10
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interesting...
so then, if one were to go and get an alignment with one set of tires and toed it out at 1/8" then flipped out to larger tires (diameter-wise) without an adjusting alignment, potentially the car could be toed out even further? |
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Hm, this makes me think there has to be some standard toe plate width everyone uses when they code their alignment machine computers. I wonder what that length is. Also, based on what I'm finding on searches for "toe plates", most companies carry a single toe plate width. |
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so would the conversion of toe be different for everycar?
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#15
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I can't imagine it would be, so I need to find out what the standard is for toe plate size. Problem is, what if you've wheels that are too big to use a toe plate on?
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