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Old 02-02-2013, 01:45 PM   #1
bigdesignmachine
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Revo Knuckle suspension on the ST?

The RS500 has this. I watched a video on Youtube last night talking about the Revo Knuckle suspension that the RS500 features and how it works to compensate for certain things during driving.

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


The question is, is Revo Knuckle suspension possible on the ST ? I know instead of Revo Knuckle, Ford went with having the ESC help with torque steer but even with that being available on the ST, could Revo Knuckle be added ?


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Old 02-02-2013, 02:27 PM   #2
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Waste of time if anything just get a LSD, it would cost alotttttttttttt less
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Old 02-02-2013, 07:43 PM   #3
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Well until someone produces an LSD for the ST we can only dream up ideas.

And the question was more geared towards is it possible.


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Old 02-05-2013, 10:43 PM   #4
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Quote:
Originally Posted by bigdesignmachine View Post
The question is, is Revo Knuckle suspension possible on the ST ? I know instead of Revo Knuckle, Ford went with having the ESC help with torque steer but even with that being available on the ST, could Revo Knuckle be added ?
Not easily. Lots of stuff got changed on the RS.
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Old 02-08-2013, 12:01 PM   #5
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Well until someone produces an LSD for the ST we can only dream up ideas.

And the question was more geared towards is it possible.


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Old 02-26-2013, 11:05 AM   #6
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The RevoKnuckle will likely be on the upcoming Focus RS, if they decide to produce it and if it comes to the US. It's one of the ways to help set the RS off above the ST aside form simply more power.

The Revoknuckle really doesn't function the same as an LSD. It's made to address a different issue.
- A LSD will help you put power down coming out of a turn. Getting power to the correct wheel.
- Revoknuckle changes the geometry of the front suspension as it attaches to the wheel knuckle to counteract torque steer.

Both would work together beautifully, but they are completely independent of one another. So yes you could put revoknuckles in a car without an LSD. Obviously having both would compliment each other better.

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

Most of that should be similar of compatible. For instance I can't imagine they moved the steering rack between the RS and the ST, so presuming tie rods would be fine, would obviously need to be adjusted. I doubt they changed the geometry of the brake caliper mounting points.

But the whole point of the Revoknucle is to change the geometry of the front suspension and where the steer points attach in relation to the axles. So you'd need to confirm that this change in geometry would be compatible with the Focus ST suspension, steering, and axles.

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.

So without retuning that, you'd still be using up brake pads, and not really fully taking advantage of having the Revoknuckles.

Cool idea, I'd love to see it done. Best of luck if you get serious about investigating the feasibility!
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Old 02-26-2013, 08:44 PM   #7
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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
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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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Old 03-28-2013, 09:59 PM   #8
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Quote:
Originally Posted by jsr72 View Post
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.
When it comes down to it, the RevoKnuckle is a mini double wishbone suspension. It nullifies camber.

Now if they had an electric clutch driven mechanical LSD, they could use that for torque steer compensation by directing torque to the wheel on the outside of the curve caused by the torque steer.

They're going to have to throw every trick they have in the book to deal with an FWD car that delivers 325+ hp, which will want to rip your tendons apart with epic torque steer.
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Old 03-28-2013, 10:24 PM   #9
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It would have been cool for ford to put the revo knuckle on the st, but the bean counters put the ckubosh on that. The less parts difference between the regular & st foci's the better. I like mechincal grip over electronics, myself. I like more edge to it. It is a performance car & should have more edge to it & less electronics.
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