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> Glimpse of Things to Come?
Rusty
post Dec 8 2006, 02:24 PM
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Eric,

I like the welds... you've done good work.

Are you worried about stiffening up the arms too much? Personally, I'd rather have an arm fail than the suspension ear.
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Rand
post Dec 8 2006, 02:32 PM
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Joe's suggestion is good. Welding that plate all the way across to box it is going to make it a lot stronger.

My thought is, why not cut a piece of tubing to fit and just weld one piece rather than three. Plus the rounded shape would be even stronger.

(EDIT: OOps, I see Chris sorta beat me to it... One formed piece. Again though, I think a rounded shape is better than a flat cap.)


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736conver
post Dec 8 2006, 02:37 PM
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QUOTE(Lawrence @ Dec 8 2006, 02:24 PM) *

Eric,

I like the welds... you've done good work.

Are you worried about stiffening up the arms too much? Personally, I'd rather have an arm fail than the suspension ear.

Thats what I was thinking. Where is the stress going to goto now and what will it do.
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Aaron Cox
post Dec 8 2006, 02:43 PM
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maybe eric will sell suspension ear beef up kits too! (IMG:style_emoticons/default/chairfall.gif)
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Eric_Shea
post Dec 8 2006, 08:35 PM
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QUOTE
I agree with Joe that it should have cap. I also think it should be one formed piece to cut down the amount of welding (warpage) and should be 14-16 ga sheet metal, no more.


Thanks Chris. Actually... this looks like something you already did. I revisited the trailing arm thread today and saw a bunch of pictures in the middle of the thread that I missed... hmmmmmm. Not wanting to step on toes or reinvent the wheel.

I guess I'll just play with these for my car.

The idea was to have a fairly simple kit for the spirited driver/autocrosser. I'm also welding in two 1" tubes through the arm which I see now had been discussed in that thread as well. I know it's nothing new but, I was thinking of offering it as a service at around $395 a pair. (IMG:style_emoticons/default/confused24.gif)
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Eric_Shea
post Dec 8 2006, 08:38 PM
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Thats what I was thinking. Where is the stress going to goto now and what will it do.


I have the GT chassis to ear turnbuckles on my car. I didn't want to make these too beefy but solid enough were they wouldn't flex so much. Basically, I was shooting for a little more strength than the boxed arm kit without the weight.
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Eric_Shea
post Dec 8 2006, 08:39 PM
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What kind of welder did you buy?


Lincoln 135
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john rogers
post Dec 8 2006, 08:42 PM
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When I was spun into a curb in the race in Tijuana this summer at about 30 MPH or so, the are you are gusseting never was affected. The box section of the trailing arm collapsed giving the rear wheel about 45 degrees of toe in or until the tire hit the pivot area. When we pulled the bent arm off the bearing area was fine.
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Rusty
post Dec 8 2006, 08:51 PM
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John,

Are you the "John Rogers" that does the great repro windshield stickers?

If so, your input would be welcome in this thread:

http://www.914world.com/bbs2/index.php?showtopic=65245

If not... sorry to bother. (IMG:style_emoticons/default/smile.gif)

-Rusty (IMG:style_emoticons/default/smoke.gif)
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pete-stevers
post Dec 8 2006, 11:27 PM
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what Brad might say....."it will crack at those welds.....i've seen it before"
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PRS914-6
post Dec 9 2006, 12:23 AM
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Before and after shots. Clears 245/45/16's with ease

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Eric_Shea
post Dec 9 2006, 09:53 AM
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Excellent Paul,

I see you've been down this road. Any findings? Has the car hit the road since the mods?

Looks like this has been done (quite) a few times before then... I may proceed. (IMG:style_emoticons/default/idea.gif)

I'm still thinking of the two tubes vs. the boxing kit. I have the boxing kit on my arms now but it looks like the tube will do slightly more than the boxing kit for a few oz.'s vs. a few lbs.

From what I've read, the boxing kit weighs 3lbs. and will add nearly 40% in rigidity to the stock arm. Tubes would add over 50%.

Just trying to delve into a practical, real world application that won't cost an arm and a leg. (IMG:style_emoticons/default/confused24.gif)

Thanks for the pics Paul.
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PRS914-6
post Dec 9 2006, 11:22 AM
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If I recall, it was Rich Johnson who suggested cross tubing the arms. I thought it was an excellent idea to prevent twist. Unfortunately I had picked up a set of the std arm kits on eBay dirt cheap so I went that route instead.

I know a lot of people frown on the reinforce kits but with 300hp and sticky 245 tires, I felt something should be done so I did what seemed appropriate for my build......time will tell

As far as the driving goes.....I test drove the car before it went to paint (no doors, hoods, or windshield). I wanted to make sure there were no major mechanical problems to deal with after the exterior was painted and the engine needed to be trial run before warranty runs out.

Bottom line....couldn't check the arm stiffness but it did scare the shit out of me.... (IMG:style_emoticons/default/w00t.gif)
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Eric_Shea
post Dec 9 2006, 02:06 PM
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I know a lot of people frown on the reinforce kits


I think they're great. 3lbs. and a 40% stiffer arm. Unless you're on an all out diet that's a pretty easy way to stiffen up an arm
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Eric_Shea
post Dec 9 2006, 06:20 PM
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OK... had a little time for "me" this afternoon.

Got some holes drilled and some 1" tube welded in. (IMG:style_emoticons/default/welder.gif)

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Note to self... hire out the hole drilling. (IMG:style_emoticons/default/dry.gif)

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Now for a little powdercoating (IMG:style_emoticons/default/wink.gif)
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Eric_Shea
post Dec 9 2006, 06:33 PM
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Both a stock arm and this arm weigh in at 15.8 lbs. on a digital scale.
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SirAndy
post Dec 9 2006, 08:17 PM
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QUOTE(Eric_Shea @ Dec 9 2006, 04:20 PM) *

OK... had a little time for "me" this afternoon.


you're getting there ... all the ones i have seen done this way had at least one tube going top/bottom. seems like that way you would get even better results, working in both planes, not just one ...

(IMG:style_emoticons/default/bye1.gif) Andy
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LvSteveH
post Dec 10 2006, 11:29 AM
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QUOTE(Eric_Shea @ Dec 9 2006, 04:33 PM) *

Both a stock arm and this arm weigh in at 15.8 lbs. on a digital scale.


Note to self, don't trust Eric's scale (IMG:style_emoticons/default/chairfall.gif)
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Brett W
post Dec 10 2006, 12:48 PM
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hijacked:
Here is a good example, albeit extreme, of what happens to an swing arm when radically loaded through the tire contact patch.


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So.Cal.914
post Dec 10 2006, 01:02 PM
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A BFH and some bondo..... (IMG:style_emoticons/default/thumb3d.gif)
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