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 Tyre Rubbing /Steering Geometry
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Derek
V4 Guru

United Kingdom
2192 Posts

Posted - 16 Oct 2018 :  12:52:52 Show Profile Reply with Quote
Something wrong there I think, especially the right lock where you appear to have both wheels angled the same. See
https://en.wikipedia.org/wiki/Ackermann_steering_geometry

Wiki is example only, there are videos and other articles available.
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Dynorog
V4 Fanatic

United Kingdom
250 Posts

Posted - 16 Oct 2018 :  13:27:44 Show Profile Reply with Quote
Thanks Derek, I think I’ve printed off the wrong revision of my efforts to make into a JPEG image. I’ll reprint. The ackerman angle is the next to incorporate to see how it influences my physical measurements of the spare rack movement.
Cheers

Dynorog
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stevebod
V4 Fanatic

United Kingdom
416 Posts

Posted - 16 Oct 2018 :  15:19:18 Show Profile Reply with Quote
Good work Roger.
I'm interested to see where this leads.
From your reading of the manual though - it sounds like we should expect different left and right steering angles, which I didn't know.
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Dynorog
V4 Fanatic

United Kingdom
250 Posts

Posted - 07 Nov 2018 :  14:47:40 Show Profile Reply with Quote
I've done some more work on the rack drawing and taken further measurements.

Wheels Straight and Zero Toe.


22.5 Degree lock left


Full lock Left
Based on measured full extent on spare rack.


I have some other scenarios drawn which I'll post later. From the pics you will see that at full lock the NS tyre is very close to the engine bay floor panel.
The rough figures from my car (i.e. marked in chalk on the driveway and the angles measured with a adjustable set square after the wheels have scrubbed around )are
full lock left 26.5 degrees NS and 29 degrees OS
I don't think the 96 steering follows the ideal ackerman curve too closely from doing a bit of maths and some reading. I don't quite know what my efforts are telling me yet but from the time its taken me I must be learning something -I hope.
Cheers

Dynorog

Edited by - Dynorog on 07 Nov 2018 14:50:55
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Dynorog
V4 Fanatic

United Kingdom
250 Posts

Posted - 21 Mar 2019 :  10:00:30 Show Profile Reply with Quote
Not much progress on this but found this on the SOC site from SAAB Driver circa 1974



Cheers

Dynorog

Edited by - Dynorog on 21 Mar 2019 10:01:44
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