Steering geometry and l/r EPA difference
12-04-2015 | 08:25 AM
#1
Steering geometry and l/r EPA difference
I often find to get even throw left and right, the EPAs for left and right are never equal. Sometimes as different as 100% to 140%, depending on the car.
I assume this is because of how the steering geometry and servo placement is unique per car. And that the servo rotates.
With EPAs for left and right being so different, this should not effect the rate of steering (in relation to radio's steering wheel movement) left to right, correct? The radio should keep the same relative steering rate and curves for left and right regardless of their differing end points?
I assume this is because of how the steering geometry and servo placement is unique per car. And that the servo rotates.
With EPAs for left and right being so different, this should not effect the rate of steering (in relation to radio's steering wheel movement) left to right, correct? The radio should keep the same relative steering rate and curves for left and right regardless of their differing end points?
12-04-2015 | 08:41 AM
#2
If you consider ackerman it can give you different turning bias I suppose.
I always wondered if the radios can incorporate static and dynamic EPA because as you stated, my cars turn different radius due to corner weight, motor torque steer, etc. My EPA's are almost always different too (but not 40 increments though!).
I always wondered if the radios can incorporate static and dynamic EPA because as you stated, my cars turn different radius due to corner weight, motor torque steer, etc. My EPA's are almost always different too (but not 40 increments though!).
12-04-2015 | 01:42 PM
#3
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If you consider ackerman it can give you different turning bias I suppose.
I always wondered if the radios can incorporate static and dynamic EPA because as you stated, my cars turn different radius due to corner weight, motor torque steer, etc. My EPA's are almost always different too (but not 40 increments though!).
I always wondered if the radios can incorporate static and dynamic EPA because as you stated, my cars turn different radius due to corner weight, motor torque steer, etc. My EPA's are almost always different too (but not 40 increments though!).
But I feel in this situation you have to base it on feel. When you come to a turn based on your speed and braking. That will make you feel how much you need to steer. Irregardless of how much lock to lock steering you have.
So if a manufacturer designs a car where both sides of the car are mirror images of each other. There shouldn't be any bias. I know you mentioned corner weight and motor torque steer. But that still shouldn't matter because your going feel how much to turn. you always setup a for how much maximum steering you need and steer accordingly for each turn. IE tires shocks etc.
Lastly imagine a rod connected to both right and left steering knuckles all the way across. And you connected the servo to that rod to steer the car. No matter where you connected it on the rod the left to right throw would still be the same. Of course give a little for play in the system.
Now for it being off by 40 increments there is something wrong there.
Ok ready for you to shred my theory to pieces
12-04-2015 | 02:34 PM
#5
That's why I think some things in racing are subjective. Almost all driving dynamics are based on math.
But I feel in this situation you have to base it on feel. When you come to a turn based on your speed and braking. That will make you feel how much you need to steer. Irregardless of how much lock to lock steering you have.
So if a manufacturer designs a car where both sides of the car are mirror images of each other. There shouldn't be any bias. I know you mentioned corner weight and motor torque steer. But that still shouldn't matter because your going feel how much to turn. you always setup a for how much maximum steering you need and steer accordingly for each turn. IE tires shocks etc.
Lastly imagine a rod connected to both right and left steering knuckles all the way across. And you connected the servo to that rod to steer the car. No matter where you connected it on the rod the left to right throw would still be the same. Of course give a little for play in the system.
Now for it being off by 40 increments there is something wrong there.
Ok ready for you to shred my theory to pieces
But I feel in this situation you have to base it on feel. When you come to a turn based on your speed and braking. That will make you feel how much you need to steer. Irregardless of how much lock to lock steering you have.
So if a manufacturer designs a car where both sides of the car are mirror images of each other. There shouldn't be any bias. I know you mentioned corner weight and motor torque steer. But that still shouldn't matter because your going feel how much to turn. you always setup a for how much maximum steering you need and steer accordingly for each turn. IE tires shocks etc.
Lastly imagine a rod connected to both right and left steering knuckles all the way across. And you connected the servo to that rod to steer the car. No matter where you connected it on the rod the left to right throw would still be the same. Of course give a little for play in the system.
Now for it being off by 40 increments there is something wrong there.
Ok ready for you to shred my theory to pieces
Well I already posted my thoughts so I welcome other inputs.
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