Trev Borg
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| posted on 29/6/04 at 10:42 PM |
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Front wheel alignment
Ok, firstly the car is an autotune gemini not a locost (but still cheap)
With the steering wheel central both wheels are parallel and pointing forwards.
At full lock either way the outside wheel turns tighter than the inside wheel.
I thought this should be the other way round. I thought the inside wheel should turn tighter ?
The steering rack is a shortened escort with cortina uprights, the rack sits forward of the upright joints.
Any advise welcome
Before you judge a man, walk a mile in his shoes.
By that time, who cares.
You're a mile away, and you've got his shoes
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Trev Borg
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| posted on 29/6/04 at 10:44 PM |
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oh, also full lock is very very tight in guess about 65 degrees (never measured)
when turning the car tight tyres skip !
Before you judge a man, walk a mile in his shoes.
By that time, who cares.
You're a mile away, and you've got his shoes
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pbura
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| posted on 30/6/04 at 12:52 AM |
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By any chance, is your rack in front of the steering arms? I think this could make for a negative "fake Ackermann" effect.
The Gemini looks like a good pick 
Pete
Pete
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Trev Borg
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| posted on 30/6/04 at 02:09 PM |
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The rack sits 2" forward of the steering arms.
The gemini chassis that i bought half built, already had the rack fitted on the chassis brackets, but I can't see any reason why I can't
move the rack further back.
I assume that this is what I need to do is it ?
Am I right in thinking that it would be better if the they were in line ?
Before you judge a man, walk a mile in his shoes.
By that time, who cares.
You're a mile away, and you've got his shoes
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crbrlfrost
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| posted on 30/6/04 at 03:21 PM |
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Ackerman has to do with the orientation of the steering arms on the uprights. With reverse ackerman, the angles are probably divergent when viewed
from the top. With typical ackerman, the steering arms point inward toward rear axle center, and this helps set up the geometry. Speaking of ackerman
though, reverse ackerman is not "fake ackerman" as it is used on formula one cars depending on the designer, just as positive caster had
been used during the skirts and venturi pods era. Cheers!
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NS Dev
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| posted on 30/6/04 at 06:00 PM |
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Yes, you need to move the rack back, preferably so the centreline is slightly (0-1"as a guess) to the rear of the steering arm ends on the
uprights when they are straight ahead
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Trev Borg
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| posted on 30/6/04 at 07:34 PM |
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I've ben reading a lot of stuff on steering and i think you're right, the only confusing thing is that the chassis is bracketeed for the
rack to go there.
That was until I did a bit web smurfing and came across a site for someone building one. He has a picture on his site that shows the brackets further
back(just where you said)
I've e-mailed him, and am wauting for a reply, but it looks like problem solved.
I had contacted Autotune firstly but was just told the the steering would need setting up properly. I may give them a ring in the morning and ask
them where its suppossed to be.
Thanks for the help guys
Before you judge a man, walk a mile in his shoes.
By that time, who cares.
You're a mile away, and you've got his shoes
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