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Old 12-12-2012, 10:38 AM   #1
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Full tubular suspension?

I am interested in doing a full-on tubular suspension. I can get front and rear control arms, sway bar end links, toe arms, and camber arms. What I can't find (and don't know if it exists) are things such as tubular knuckles, trailing arms, center links, K-members, etc. Does anybody make these things for the Focus or am I SOL?


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Old 12-12-2012, 12:10 PM   #2
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No one makes all of these parts, most of them don't offer any kind of performance advantage.

FYI, the rear suspension is overconstrained by design. Its refered to as a "control blade" system, with the trailing arms being the blades. In order for the suspension to move, the trailing arm has to flex as it goes through its motion. Attempting to replace this with a tubular piece would likely end in failure.
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Old 12-12-2012, 12:11 PM   #3
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Trailing arms would be cool, but no I haven't seen any of those before.
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Old 12-12-2012, 02:15 PM   #4
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Quote:
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No one makes all of these parts, most of them don't offer any kind of performance advantage.

FYI, the rear suspension is overconstrained by design. Its refered to as a "control blade" system, with the trailing arms being the blades. In order for the suspension to move, the trailing arm has to flex as it goes through its motion. Attempting to replace this with a tubular piece would likely end in failure.
I'm primarily looking for the weight reduction rather than any real performance gain. As far as the blade, I thought it flexed at the bushing. At least that's what it looks like from underneith. But since this is the case what would happen if I got them powdercoated? They have to bake it. Would the temp change make the material act differently?
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Old 12-12-2012, 02:33 PM   #5
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I'm primarily looking for the weight reduction rather than any real performance gain. As far as the blade, I thought it flexed at the bushing. At least that's what it looks like from underneith. But since this is the case what would happen if I got them powdercoated? They have to bake it. Would the temp change make the material act differently?
powder coating shouldnt be a problem. It usually with high performance aluminum alloys (say a 7075 T6), where the heat from powdercoating can change the metallurgy (ie. precipitation hardening)
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Old 12-12-2012, 02:40 PM   #6
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powder coating shouldnt be a problem. It usually with high performance aluminum alloys (say a 7075 T6), where the heat from powdercoating can change the metallurgy (ie. precipitation hardening)
Thanks. Good to know. When the focus gets garaged here in about 6 months its going to have a beautiful suspension with matching powdercoat.
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Old 12-12-2012, 02:41 PM   #7
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Quote:
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powder coating shouldnt be a problem. It usually with high performance aluminum alloys (say a 7075 T6), where the heat from powdercoating can change the metallurgy (ie. precipitation hardening)
^^This, the powder coating temperature can approach the aging temperature of some aluminum alloys. It won't be hot enough to impact the steel.

Both the bushing and the arm flex. The flexing is of a side to side, you can see it occur if you take of the wheel and move the suspension though its motion. It's also apparent if you have to reinstall the camber arms, and you notice its a lot easier to put them in if the suspension is at ride height.

Overall, I would think that the weight reduction you could manage from tubular links would be pretty minimal. Not sure what you have on the car now, but there is a lot of other low hanging fruit on the car.
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Old 12-12-2012, 04:21 PM   #8
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Quote:
Originally Posted by wrc_fan View Post

Both the bushing and the arm flex. The flexing is of a side to side, you can see it occur if you take of the wheel and move the suspension though its motion. It's also apparent if you have to reinstall the camber arms, and you notice its a lot easier to put them in if the suspension is at ride height.=

Overall, I would think that the weight reduction you could manage from tubular links would be pretty minimal. Not sure what you have on the car now, but there is a lot of other low hanging fruit on the car.
Totaley agree ^^^^^^^^^^^^^^^^
The control blade trailing arms is what give the Foci the handling prowess. You have a '08+ car hence alot of safety debris= curtain air bags+. I'd start w/ a earlier car. I always used the '80-'82 Mustang's forstance vs the '87+ cars.
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Old 12-15-2012, 01:48 PM   #9
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Totaley agree ^^^^^^^^^^^^^^^^
The control blade trailing arms is what give the Foci the handling prowess. You have a '08+ car hence alot of safety debris= curtain air bags+. I'd start w/ a earlier car. I always used the '80-'82 Mustang's forstance vs the '87+ cars.
This car may look like a boat, but with what I have into it already I was running as fast or faster than modded out miatas at the last autox. My goal is to have it as a track ready cruiser I can go on road trips with (such as to FocusFest).
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Old 12-15-2012, 08:32 PM   #10
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Yes the parts you're asking about exist, or did. But the cost of them far outweighs the benefits, in any situation. For full 'tubular' suspension you're looking at spending over $2,000+. IMO, for that kind of money you can overcome the weight loss with much more power.

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