Automotive Roll stiffness affecting Steering Effort .

AI Thread Summary
Increased roll stiffness can lead to higher steering effort due to reduced weight transfer to the front tires during cornering, resulting in less grip and increased tire deformation. The modifications to the front suspension geometry, including raising the roll center, have decreased the effective roll moment but may have inadvertently reduced the load on the front tires, making steering feel heavier. The driver’s feedback indicates that the car's handling characteristics have changed, particularly during trail braking and cornering. To alleviate steering effort, options include adjusting suspension geometry or exploring different tire compounds, rather than simply changing the scrub radius or steering wheel size. Ultimately, the balance between roll stiffness and steering response is crucial for optimal performance in touring car setups.
satya430
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I am currently working for a Touring Car Team . I have modified the front suspension geometry . Made the roll moment lesser and increased the Roll stiffness . Driver complained that the steering effort has increased considerably in the corners .

1.How does increased roll stiffness increase steering effort ? Does it have anything to do with the lateral load due to diff geometries pushing the tire down or giving it a more of a tire wall deformation effect ?

2.What are the methods to reduce steering effort other than
a.Reducing the scrub radius .
b.Increasing the knuckle moment (very difficult as it changes the steering geometry) .
c. Simply giving him a bigger steering wheel .
 
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what exactly did you do? what is the car doing at turn entry, middle and turn exit?
 
I am working to change the stock suspension of a touring car (Mc Pherson Strut)
The front suspension geometry is being changed (the question above is about the new front geometry) . I have brought the front roll center of the car closer to the front Center of Mass(or mass centroid as referred to as in many books) . This has decreased the effective roll moment and thus increased my roll stiffness of the front without having to stiffen my springs .
Now as I have kept the new control arm ball joint in the same position of the old one , the KPI and scrub radius shouldn't have changed . As the driver complains that steering needs more effort now , what could have caused it .
The car trail brakes at the entry (dive-wt transfer to the front and roll-wt transfer to the outer ) . It kisses the apex (ideal condition) and then accelerates out of the corner . Pl. tell me if I am wrong .
 
i sure dfo believe the driver now has a handful driving..when you rasie the roll center it shortens the lever arm and you have a lot less weight being planted on the front tire in a turn. Plus you increase camber build
i am not a big fan of high RC..the lower, the better
 

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