mad-butcher
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| posted on 11/6/08 at 06:48 PM |
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Help with Mathematical Calculation Required
Evening All
I have 3mm toe in on the indy and would like to know what this equates to in degrees but absolutely no idea how to go about working it out.
the two points on the wheels I used as reference poins to take the track measurements are 13.75 inches apart
Many Thanks
Tony
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Volvorsport
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| posted on 11/6/08 at 06:55 PM |
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3mm toe in total ?
measured at half distance ? (ie centreline thro the hub )
www.dbsmotorsport.co.uk
getting dirty under a bus
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mad-butcher
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| posted on 11/6/08 at 07:02 PM |
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3mm in total
point a) rear inside of rim to rear inside of rim
point b) 13.75 inches forward
front inside of rim to front inside of rim
hope that explains what I mean
Tony
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Volvorsport
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| posted on 11/6/08 at 07:18 PM |
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make a 90 degree right angle , apply 1.5mm to the short side 13.75 inches to the hypoteneuse (spelling ?) , and use the laws of trigonemetry to work
out the angle .
which to be honest isnt goint to be a great deal !
ill go find teh formula for you - why do you need to know teh angle ?
www.dbsmotorsport.co.uk
getting dirty under a bus
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Macbeast
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| posted on 11/6/08 at 07:25 PM |
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It's as near as dammit 0deg. The play in your steering is probably more than 3mm
edit after found calculator
Seems to be 2.5 deg
Edit after finding stupid mistake 
13.75" = 349mm
sin x = 1.5 / 349 = 0.0043
x = 0.25 deg
Not sure how "Toe in" is measured - if it's the angle between straight ahead and one wheel it's .25 deg: if it's the
angle between one wheel and the other it's 0.5 deg
[Edited on 11/6/08 by Macbeast]
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mad-butcher
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| posted on 11/6/08 at 07:35 PM |
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Spent ages setting it up for trackday use now I'm setting it up for the SVA I need to induce a degree of self centering
running with MK mushrooms facing forward. 1.5 degree neg camber. and 3mm toe in,,caster and camber are I believe about right. but I need a couple of
degrees toe out to induce the self centering
Tony
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adithorp
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| posted on 11/6/08 at 08:48 PM |
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3mm equates to about .5 degree or 30 min'. This varies with wheel size but not much. Check twice 1/2 turn of the wheels apart to allow for any
variation in the wheels and take the average. Check after rolling forward to a stop to get consistent results.
adrian
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