panichat
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| posted on 26/3/11 at 11:28 AM |
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Steering improvements 2
Hi all
In the thread further down the page we have been discussing how to get fantastic steering (because quite a few people are struggling to get beyond the
"IVA pass but not good enough" stage.
People have contributed lots of great ideas but we still haven't got a definitive measurement of exactly where the upper and lower ball joints
should be in relation to each other.
Would any clever/confident people like to put forward their opinion for length A and/or angle B
 
Castor diagram
Thanks
Dave
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mad4x4
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| posted on 26/3/11 at 11:33 AM |
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if we know A we can calc Angle B
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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Confused but excited.
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| posted on 26/3/11 at 12:34 PM |
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Surely you define angle A as required and then calculate dimension B to suit the wishbone vertical spacing.
Tell them about the bent treacle edges!
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hicost
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| posted on 26/3/11 at 12:52 PM |
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How to
I have just gone through this exercise and purchased the following two pieces of equipment
 
Description
 
Description
Tried lots of ways before but these enabled me to get the castor I wanted. I cut all the suspension off the front of the car and welded on new
brackets to suit. 
"I cant do that without accidentally grabbing hold of the work of the divine potter"
 
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panichat
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| posted on 26/3/11 at 01:52 PM |
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HiCost - I'm full of questions - What are those? Where did you get them? Were they expensive? What castor angle gave you the best result?
Dave
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mad4x4
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| posted on 26/3/11 at 02:14 PM |
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Any one got a set of MK Indy wozsher arems that they can measure. this should give us a ball park?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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prelude1980
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| posted on 26/3/11 at 03:27 PM |
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I did mine with an angle of 7-8 degrees, my self centering seems fine
Speed has never killed anyone. Suddenly becoming stationary... that's what
gets you.
https://www.topcashback.co.uk/ref/dodd1980
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Bare
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| posted on 26/3/11 at 04:42 PM |
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Castor is curious.
On a Lotus Elan and Europa it is set at 3 degrees. On a lotus Seven it is at 5 degrees.
A series 4 Seven I believe(?) is at 3 degrees
ALL of the above cars have 'proven' to handle erm..better than most.
Possibly there are other bindings (?) in the suspension / steering setup that causes self centering to be poor?
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panichat
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| posted on 26/3/11 at 06:01 PM |
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Outcome
Ok - it a long time since I did this type of maths so feel free to find errors.
Assuming an angle of 8 degrees is suitable (angle between vertical and line joining the upper and lower ball joints).
Distance between centre of ball joints (hypotenuse) = 210mm (approx)
sin 8 = A/210
A=sin8 x 210 = 0.13917 x 210 = 29.2mm
Therefore an offset of 29mm seems about right.
I am a bit short of that so I need to move the upper brackets back about 9mm.
Please give comments before I get get the angle grinder out!!!!!
Cheers Dave
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britishtrident
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| posted on 9/5/11 at 04:28 PM |
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Root problem is lack of (virtual) King Pin Inclination designed into the Ford upright a light car needs more KPI than a heavy car. KPI is the main
generator of self-centering and steering stability.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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