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Thread: Tubular front control arms

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Posts: 181-190 of 363
2010-07-19 13:17:00
#181
Originally Posted by mevans
How about some more testing i.e. FMEA and fatigue before this product is available. I applaud your design efforts but these are critical suspension components we are talking about now.


You must work for an ISO company?? FMEA's used to be my life in my last job.

Here at OEM we do our own Failure Mode Effects Analysis. We analyze the product and all of its potential failures, then we take it to the next level and reinforce. We have taken many steps to increase performance (weight gains) and safety considerations.

Originally Posted by wnwright
Uhm No

Usually when the arm fails the force after failure on the other parts which are no longer supported also have a tendency to fail (especially tie rods and sway bar mounts (depending on where failure point is)... strut is stronger, but can rip out if upper hat isn't supported). I find it VERY hard to believe you would have a situation where it would just "cave in and wobble". Usually the failure will rip the wheel off or rip it sideways and throw the car out of control. Failure is a BIG deal.

Not saying your design will fail, but failure is a big deal if it does happen. I do question anything where you are able to take a structural member and reduce 10lbs out of it. Based on that I have to suspect the margin of safety has been reduced. Typically tubular arms are able to take a couple of pounds when compared to stamped arms with no reduction in margin.



To be honest things could happen ... just like a Prius, or BP you can design a product, test it and it could still have a problem that you could have never imagined.

We have been building quality, well built, strong products for a while now.

If you have questions about integrity please ask and we will do our best to explain the steps taken to reduce their effects to as close to zero as possible.

The arm uses superior materials, superior welds and superior additions such as the rod ends and the delrin bushings. The arm has been reinforces using .25" plate, plasma cut to conform to the arm dimensions thus leaving less of a gap and more contact for reinforcement and unlike conventional tubular arms we have taken into account failure points with reinforced "soild" construction.

- Brian - OEM
2010-07-19 14:13:15
#182
More pictures of the New arms installed. Here you can see the true advantage of our arm. Perfect 90 degree angle. Also notice that its adjustable too. So if you have coilovers you can adjusts accordingly.

Mark-OEM



2010-07-19 15:42:41
#183
I am still interested just let me get my ducks all in a row. I will pay for a set within 3-4 weeks.
2010-07-19 17:48:42
#184
Yep, I know what you mean. Sounds good just let us know.

Mark
2010-07-19 21:07:00
#185
Yes, if you are doing 100 or tracking the car I guess. And you are correct,the new arms are 1.8lbs lighter on each side. Please dont tell me we spent 3 months of design and 2 different arm styles for you guys to bash us without even seeing any results. We took on this project to better the outcome of the car and to fix a MAJOR problem.
Please tell me there is still interest in these.


I was just asking a a question. I am not bashing anyone. Like I said before I like the design. I was asking because (a) the weight reduction, which is not in itself a bad thing, and (b) the stiffness of the new assembly because of transfer forces that will be involved. What I am saying is just don't concentrate on the failure potential of the new part. Where are the transfer forces going, and will it fatigue a struture that attaches. Was there an amount of flex built into the orginal arm, is that part of the weighted design that is in it.
Not bashing, just asking.
2010-07-19 21:33:29
#186
I just drove on these and all I can say is WOW!!

Car is much more responsive and dare I say it "Crisp" on turn in. I actually scared Mark with my 90 degree turn ins at full throttle. It's on the lift now for inspection and all is well.

Get these now while you can!!
2010-07-19 22:38:56
#187
Originally Posted by Overkill
Yes, if you are doing 100 or tracking the car I guess. And you are correct,the new arms are 1.8lbs lighter on each side. Please dont tell me we spent 3 months of design and 2 different arm styles for you guys to bash us without even seeing any results. We took on this project to better the outcome of the car and to fix a MAJOR problem.

Please tell me there is still interest in these.


1.8lbs is a reasonable drop in weight. I saw previously in a post where it states an arm was "10 lbs" lighter. I assumed that was a typo and was 5lbs per an arm which still is alot of drop, which is why I questioned. 1.8lbs on the other hand is fairly normal weight drop.

It is very good to hear that there were months of design. I have just seen way too many times designers/engineers overlook important factors in a design. There are PLENTY of ways to f up a design especially a suspension component that could seriously hurt people. Hopefully you guys have proper insurance to cover you guys.

I can see somethings I would do different/improve, but I don't see anything that makes me think these would fail under normal life cycle.

Don't take my comments as attacks or anything... I just come throw things out as critical review like I do of all designs I work or look at. (it doesn't appear you are here, but just wanted to say it)
2010-07-19 23:06:10
#188
Looks like these are hard welded for certain sway bars (progress), will a ST or stock bar still work with these? Also, many of use have rear bushings for added caster, is there an option to get the arms without the rear bushings (as they would just get thrown in a box and forgot about)? Or do these arms only work with those bushings?
2010-07-19 23:07:07
#189
Originally Posted by wnwright
1.8lbs is a reasonable drop in weight. I saw previously in a post where it states an arm was "10 lbs" lighter. I assumed that was a typo and was 5lbs per an arm which still is alot of drop, which is why I questioned. 1.8lbs on the other hand is fairly normal weight drop.

It is very good to hear that there were months of design. I have just seen way too many times designers/engineers overlook important factors in a design. There are PLENTY of ways to f up a design especially a suspension component that could seriously hurt people. Hopefully you guys have proper insurance to cover you guys.

I can see somethings I would do different/improve, but I don't see anything that makes me think these would fail under normal life cycle.

Don't take my comments as attacks or anything... I just come throw things out as critical review like I do of all designs I work or look at. (it doesn't appear you are here, but just wanted to say it)


My point too.
2010-07-19 23:22:28
#190
Originally Posted by zer099
Looks like these are hard welded for certain sway bars (progress), will a ST or stock bar still work with these? Also, many of use have rear bushings for added caster, is there an option to get the arms without the rear bushings (as they would just get thrown in a box and forgot about)? Or do these arms only work with those bushings?


I would like to know about this too, especially the question about the sway bar will the factory one mount with out modifications?
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