under the skin of the Focus RS
video description
Best analogy: The Standard set up represents a long spanner, the RevoKnuck represents a small spanner. It's easier to turn a longer spanner and this is what you don't want.
Date: 2022-04-17
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Comments and reviews: 9
EdgyNumber1
-kevrs2 Theoretically it's possible but the problem here is one of cost. It's not like shortening springs, shocks to lower the height of the vehicle. You have to fundamentally change the geometry of the front suspension and that takes a lot of R&D to get it right, so it'd be unlikely they'd come up with a kit for that specific car. It's not impossible. The struts would need to put in a fixed position, a new type of hub would need to be engineered and produced, and that's after thousands of miles
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-kevrs2 Theoretically it's possible but the problem here is one of cost. It's not like shortening springs, shocks to lower the height of the vehicle. You have to fundamentally change the geometry of the front suspension and that takes a lot of R&D to get it right, so it'd be unlikely they'd come up with a kit for that specific car. It's not impossible. The struts would need to put in a fixed position, a new type of hub would need to be engineered and produced, and that's after thousands of miles
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EdgyNumber1
-kevrs2 Renault use something similar in their current high power Megane. I'm not sure whether they use the same type of diff though. Ford uses an advanced ATB diff, and Quaife Engineering can supply these to almost ANY standard road car as a direct replacement to the old diff that's in there. Unlike LSD's, ATB type diffs need no maintenance, and because they use gearing instead of pre-load clutches, they are 'fit-and-forget'. Maintenance free, with a life time warranty. :)
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-kevrs2 Renault use something similar in their current high power Megane. I'm not sure whether they use the same type of diff though. Ford uses an advanced ATB diff, and Quaife Engineering can supply these to almost ANY standard road car as a direct replacement to the old diff that's in there. Unlike LSD's, ATB type diffs need no maintenance, and because they use gearing instead of pre-load clutches, they are 'fit-and-forget'. Maintenance free, with a life time warranty. :)
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EdgyNumber1
Hmm. The problem is that you cannot get over the physics of FWD cars in general, in that the wheels up front -still- have to do all the work. However RevoKnuckle is very effective though in reducing the scrub radius which in turn reduces the leverage forces which result in torque steer(look at the diagram at wheel offset and kingpin geometry), making, at least straight line acceleration more comfortable. the semi active diff and the electronic trickery controls the rest.
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Hmm. The problem is that you cannot get over the physics of FWD cars in general, in that the wheels up front -still- have to do all the work. However RevoKnuckle is very effective though in reducing the scrub radius which in turn reduces the leverage forces which result in torque steer(look at the diagram at wheel offset and kingpin geometry), making, at least straight line acceleration more comfortable. the semi active diff and the electronic trickery controls the rest.
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EdgyNumber1
-Deango2 The diff is an ATB type and not a clutch based LSD type diff. It features gearing rather than the usual clutch plate system used LSD's, therefore the torque biasing to the wheel with the most grip is far more progressive and doesn't snatch (reducing torque steer further) Quaife do aftermarket options for many, many cars, world wide and can even build them to order. They are direct replacement, 'fit-and-forget' (and as a result, come with a lifetime warranty.
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-Deango2 The diff is an ATB type and not a clutch based LSD type diff. It features gearing rather than the usual clutch plate system used LSD's, therefore the torque biasing to the wheel with the most grip is far more progressive and doesn't snatch (reducing torque steer further) Quaife do aftermarket options for many, many cars, world wide and can even build them to order. They are direct replacement, 'fit-and-forget' (and as a result, come with a lifetime warranty.
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EdgyNumber1
-TheSaintST1 of testing and different set-ups. In all honesty, the best thing you can do to minimise the torque steer is the use of an ATB diff (which you say you have, use poly-bushes on ALL mounting points, especially the Track Control Arms to reduce longitudinal movements against the road. Ensure the car is balanced laterally (no weight bias on either side, ensure all wheels are balanced. The key here is to make sure that everything is in balance and not loose.
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-TheSaintST1 of testing and different set-ups. In all honesty, the best thing you can do to minimise the torque steer is the use of an ATB diff (which you say you have, use poly-bushes on ALL mounting points, especially the Track Control Arms to reduce longitudinal movements against the road. Ensure the car is balanced laterally (no weight bias on either side, ensure all wheels are balanced. The key here is to make sure that everything is in balance and not loose.
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EdgyNumber1
-TheSaintST1 Double wishbone is still more effective, especially if optimised for weight and is more flexible to tune -but- it costs far too much to implement- a problem that Rover/Honda found with 400/Civic - interestingly it handles very well, especially in MG ZS form. RevoKnuckle is a high cost effective way of getting close to the benefit of having double wishbone for much less money.
Personally I think it's a brilliant piece of engioneering!
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-TheSaintST1 Double wishbone is still more effective, especially if optimised for weight and is more flexible to tune -but- it costs far too much to implement- a problem that Rover/Honda found with 400/Civic - interestingly it handles very well, especially in MG ZS form. RevoKnuckle is a high cost effective way of getting close to the benefit of having double wishbone for much less money.
Personally I think it's a brilliant piece of engioneering!
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EdgyNumber1
-syxxsyxxsyxx It does under very hard acceleration in a straight line. That's the physics of transaxle FWD i'm afraid, no matter what gizmos and gubbins you throw at it. Where this sytem really comes into it's own is cornering stability - it just grips, and grips - torque steer is seriously reduced when accelerating from the apex of a bend - this means more stability thus more speed.
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-syxxsyxxsyxx It does under very hard acceleration in a straight line. That's the physics of transaxle FWD i'm afraid, no matter what gizmos and gubbins you throw at it. Where this sytem really comes into it's own is cornering stability - it just grips, and grips - torque steer is seriously reduced when accelerating from the apex of a bend - this means more stability thus more speed.
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JaySee5
What he says doesn't make sense. Honda used to make double wishbone FWD cars, but they still had torque steer. It can't be just the suspension, there's something in the LSD.
Why's this a big deal? Didn't Honda already solve FWD torque steer years ago with the Prelude SH? Double Wishbone + Fancy LSD.
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What he says doesn't make sense. Honda used to make double wishbone FWD cars, but they still had torque steer. It can't be just the suspension, there's something in the LSD.
Why's this a big deal? Didn't Honda already solve FWD torque steer years ago with the Prelude SH? Double Wishbone + Fancy LSD.
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EdgyNumber1
-Rawr454 I have to partly agree with him on this, you cannot totally eliminate torque steer on an FWD car simply because of all the jobs the transaxle has to do. You can take certain counter measures, both passive and active in order to control it but you can never totally eliminate it.
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-Rawr454 I have to partly agree with him on this, you cannot totally eliminate torque steer on an FWD car simply because of all the jobs the transaxle has to do. You can take certain counter measures, both passive and active in order to control it but you can never totally eliminate it.
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