Focus Fanatics - View Single Post - Revo Knuckle suspension on the ST?
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Old 02-26-2013, 08:44 PM   #7
jsr72
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Join Date: Apr 2012
Fan#: 97393
Location: n/a, United States
What I Drive: 2012 Focus SE

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Quote:
Originally Posted by apagios View Post
I would suspect to even try putting a RevoKnuckle on an ST you would have to order spare parts from Europe. Assuming you could get the Revoknuckles ordered, here's a first blush guess at what you'd have to confirm before trying it.

Compare everything that attaches to the wheel knuckle:
- Axle length
- wheel bearings
- Tie rods & ends, length fittings
- Brake caliper mounting points
- Macpherson strut mount point
- Ball joint mount
Flared fenders for the wider track, different swaybar, bigger rotors...

Quote:
Originally Posted by apagios View Post
Assuming all that, the Revoknuckle would now compensate for torque steer. But the Focus ESC automatically uses small brake applications to counter the "feel" of torque steer. So now this system would be over compensating for the forces involved in torque steer.
ESC uses braking for yaw stability. The ST uses the electric steering system to provide additional steering assist to help compensate for the steering torque felt by the driver.

Revo knuckles do not eliminate torque steer - they help reduce it in the same way a double wishbone does. Left-right asymmetries will always be present in the chassis.
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