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Old 10-19-2011, 07:44 PM
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Tubular A ARMS

Quick question on tubular A Arms since I am not a suspension guy. Will 1inch diameter, 0.65 DOM be good enough for street driving as well. The manufacturer which is Lefthander Chassis said they are good for the street as well, just want to be sure as they are a racing arm. Saves alot of cash instead of going the name brand way. Car is a 1980 Camaro Z28. Thanks

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Old 10-20-2011, 08:13 AM
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will they work... probably... this is kind of a loaded question though because it depends on the geometry of the item as much as it does the material it is constructed with. Keep in mind that the heaviest load your lower control arms will see other than the obvious collision is the rotational force under heavy braking / turning. On the pavement with a car with sticky tires and good brakes... that is alot of load.
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Old 10-20-2011, 09:26 AM
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I personally wouldn't use any tubular A-arm with a wall thickness under 0.188" wall DOM on the street,
one good pot hole while braking will fold up the 0.065 wall...
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Old 10-20-2011, 09:34 AM
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Quote:
Originally Posted by bates_k
I personally wouldn't use any tubular A-arm with a wall thickness under 0.188" wall DOM on the street,
one good pot hole while braking will fold up the 0.065 wall...
That's what I am thinking, the forces on the lower control arm at the spring mount are pretty high.

Brian
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Old 10-20-2011, 10:15 AM
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I have to go with the heavier wall too.

My thoughts were that I could avoid potholes and such being from the pot hole state....Minn.

And I did quite well up untill this summer. While cruising along behind another hotrod, he dodged a pothole and I never had a chance....bam. the right front collected it head on. Nothing bad happened other than a couple deg of added negative camber. The car doesn't pull or handle any differently. I also hit a 4 x 4 on the road that a truck coming the other way kicked across the road right into me. again no damage.

I do use the strut style control arm rather than the one piece that most guys use. These are much stronger than the one piece one.
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Old 10-20-2011, 04:40 PM
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Thanks guys, now this is only for the upper control arm, I will be using the stock lower control arm. Would you still feel that way about only changing the upper.
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Old 10-20-2011, 08:24 PM
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I've used the lighter "circle track type" tubular uppers on the street without problems, a lot less load on those than there is on the lower
arms.
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Old 10-20-2011, 10:48 PM
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Thanks for the insight. How long did you run them for, any stress or fatigue on the metal.
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Old 10-20-2011, 11:58 PM
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They've been on one '74 Z28 for about 3 years now, 12.000 miles. Driven aggressively but we work to avoid big potholes anyway. If I remember correctly, they were about .110" wall tube, maybe .125". Bronze bushed, really tightened up the front response in conjunction with poly bushed stock lowers. Real direct input into corners, for a street driver. We like it. Came from either Speedway Motors or JR Motorsports catalog.
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