Steering Ratio / Angle

[motorhead]

Is 12:1 the accepted steering ratio in a desert race car, or does it vary? What are the slowest and quickest ratios people are using. I have a Saginaw 12.5:1 in my truck right now and happy with the response but haven't driven much else in the dirt to compare it.

Also what steering angle is accepted as the norm? I understand ackerman will change the angle between the two sides, so lets measure the inside angle since it will be slightly larger. I know a 1" uniball has 30-32 degrees misalighnment which is the limiting factor on a upright with vertical uniballs, but is that considered plenty or just sufficient?

Lastly, does anyone know the ratio on a steering box from a 89-95 4X4 toyota pickup?

Thanks - David

 

[SpeedBump]

Is 12:1 the accepted steering ratio in a desert race car, or does it vary? What are the slowest and quickest ratios people are using. I have a Saginaw 12.5:1 in my truck right now and happy with the response but haven't driven much else in the dirt to compare it.

Also what steering angle is accepted as the norm? I understand ackerman will change the angle between the two sides, so lets measure the inside angle since it will be slightly larger. I know a 1" uniball has 30-32 degrees misalighnment which is the limiting factor on a upright with vertical uniballs, but is that considered plenty or just sufficient?

Lastly, does anyone know the ratio on a steering box from a 89-95 4X4 toyota pickup?

Thanks - David

The Saginaw steering box we use has a variable ratio – 13:1 at center increasing to 16:1 at max angle.

Wheels turn approx +/- 24 degrees.

 

[motorhead]

The Saginaw steering box we use has a variable ratio – 13:1 at center increasing to 16:1 at max angle.

Wheels turn approx +/- 24 degrees.

Thanks for the response SpeedBump. Variable ratio is not built into every steering box, correct? I would think a progressively quicker ratio would be advantageous throughout the pitman arm's travel to make the linear movement consistent throughout lock to lock? I hope that made sense.

Anyone else know their steering angle or ratio?

 

[D.Mavis]

I'd like to resurect this thread.

I'm designing a truck style long travel a-arm prerunner. what are peoples opinions on how many degrees of steering at the hub per turn of the wheel (steering ratio). how about the max steering at the hub?

I have it designed now for 28 degrees of steer angle per 1 turn of the steering wheel and I have the steering stop at 35 degrees either way for a total of 70 degrees total from lock to lock at the hub, this is a total of 2.5 turns of the steering wheel (this is the average of both tires as they steer different because of some ackerman)

 

[FABRICATOR]

2.5 turns and 70 degrees rotation is not bad for a prerunner.