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PostPosted: September 3, 2014, 6:06 pm 
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This is totally theoretical with no real numbers behind it...

Say you were looking down on a car from the top view and you turned the wheel of a car all the way to left lock and say the wheel rotated on it's centerline, right through the middle of the tire. What would be an "average" degree's it rotates? 25 degrees? 40 degrees? Obviously it'll be different dependent on potential bump stops, control arm design, tie rod length etc...

But is there an average out there?


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PostPosted: September 3, 2014, 7:00 pm 
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I would think around 45 degrees but I can check on my cars later.

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PostPosted: September 3, 2014, 9:28 pm 
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You don't want less than 30, 35 is better.

25 is a pain in the butt for normal usage.


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PostPosted: September 4, 2014, 8:10 am 
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The inside wheel can turn about 50 degrees on a spitfire, but that is unusual, as is the 24 foot turning circle, 12 foot turning radius.
Most caster checks are done at about 20 degrees.
Fwd and vehicles designed to be 4wd turn to a lesser degree than rwd, 2wd vehicles.

I think 40-45 would be typical max for a wheel turning out (inside on a turn), less for the wheel turning in (outside on a turn) on an oem which normally have some ackermann.

Typical suvs have a turning circle of 42 feet or more while cars and some small suvs are 35 feet or more. City cars are even better. A Smart Car has a turning circle of a little over 28 feet.

The shorter the wheelbase, the less critical the wheel max angle is. One could probably determine the approximate steering angles with published wheelbase and turning circle in hand.

My Westward trike has a turning radius of 9.5 feet.

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PostPosted: September 4, 2014, 12:07 pm 
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cheapracer wrote:
You don't want less than 30, 35 is better.

25 is a pain in the butt for normal usage.


Miata V8 brings up a point, I should have mentioned I always go off the outside wheel as ackerman and toe adjustments can change the inside angle vastly.


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PostPosted: September 5, 2014, 12:59 am 
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This is really useful information. Helps verify the rack travel desired when selecting a steering rack.

Wishbone will do all the wheel angle, Ackermann, turn radius, etc. calculating for you. Just feed Wishbone the Steer parameter and press Calc.

Here's Wishbone's definition of the Steer input:
STEER is the travel of the rack, positive in the direction which steers towards the unloaded side, e.g. in a left turn the right side is loaded.

Oh, you also need to provide the 3D coordinates of your front suspension, steering arm and rack. But its worth it if you want to know what is going up front.

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PostPosted: September 5, 2014, 1:03 am 
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Some of the drift guys are getting pretty gnarly angles with custom uprights and steering setups...

http://zilvia.net/f/showthread.php?t=296725&page=167


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