RESTO on some trailing arms and brakes....Anyone in CO interested?, Have two sets, do just one? |
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RESTO on some trailing arms and brakes....Anyone in CO interested?, Have two sets, do just one? |
stugray |
Jan 25 2011, 11:28 PM
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#1
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I took the trailing arms out of my current car for repairs to the suspension ears.
While they are out, I figure I should: Clean boxes, Reinforce with weld plates, powder coat ( or Plate? ;-), Replace rear bearings, Replace rear bushings, While I am at it, I should do the axles: strip & paint axles, replace CVs, replace boots, Get new bolts. Then the rear calipers.... Clean, rebuild kit, send to PMB performance...? Here's the rub..... I have multiple complete sets of everything mentioned above for one car. Four rear trailing arms Four rear axles SIX rear calipers.... For efficiency's sake it seems I should do all of them sets whiles I's at it. Should I do them all and keep for myself, or..... assume that I can recoup some of my costs by selling/trading the extra sets here after they are rebuilt? Group buy in NOCO area on some cleaning, & powder coating? I think I would need to buy 4 new bearings for the arms and 4 CVs to make four good axles... Stu |
McMark |
Jan 26 2011, 12:08 AM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Do them all if you have the means.
Skip welding on the reinforcement plates. They're more dead weight than anything else and there's a lots more effective places to put that weight than on the trailing arm. |
avidfanjpl |
Jan 26 2011, 12:13 AM
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#3
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914 Hemophiliac Group: Members Posts: 720 Joined: 6-April 10 From: Bear, Delaware Member No.: 11,566 Region Association: MidAtlantic Region |
On that subject of reinforcing stock 914 trailing arms, Mark, what is the risk if you run a 914-6 without reinforcing?
I never heard any story of stock ones in good shape ever failing. I am not talking about rusty or bent ones, just totally stock ones in good shape. I hear all sorts of stories. What have you heard? Just that it is dead weight? I am really interested in what you say. Thanks! John avidfanjpl Do them all if you have the means. Skip welding on the reinforcement plates. They're more dead weight than anything else and there's a lots more effective places to put that weight than on the trailing arm. |
stugray |
Jan 26 2011, 01:17 PM
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#4
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Mark,
"They're more dead weight than anything else" So the boxes sold by AA are useless? They dont look very heavy. How about what Tangerine racing does to their "upgraded trailing arms": 'Welded Internal and External Reinforcements to eliminate flex and twist'? Is that different from just welding the box on the outside? I saw on another thread around here recently, that you can reinforce these by welding addition tubes in just like the one that is already in there? ( I think for brake adjustment? ). John avidfanjpl Do you work at JPL? |
Eric_Shea |
Jan 26 2011, 01:25 PM
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#5
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PMB Performance Group: Admin Posts: 19,278 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Do this... it's easier, lighter and stronger:
(IMG:http://www.914world.com/bbs2/uploads_offsite/sphotos.ak.fbcdn.net-1110-1296069933.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/sphotos.ak.fbcdn.net-1110-1296069935.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/sphotos.ak.fbcdn.net-1110-1296069936.3.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/sphotos.ak.fbcdn.net-1110-1296069936.4.jpg) Boxed arms only add about 4-6lbs each if I recall and they stiffen by around 40%. Not a bad tradeoff but these will be stronger and weigh nothing. I heard about an old racer that was doing this. We offer it as a service now but feel free to plagerize it... I didn't invent it. (IMG:style_emoticons/default/wink.gif) |
SirAndy |
Jan 26 2011, 02:05 PM
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#6
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Resident German Group: Admin Posts: 41,679 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
How about what Tangerine racing does to their "upgraded trailing arms": 'Welded Internal and External Reinforcements to eliminate flex and twist'? Are you running sticky race rubber slicks? If the answer is no, i don't see any need for any trailing arm reinforcement. If the answer is yes, the additional tubing is the better choice over the clam shells. (IMG:style_emoticons/default/bye1.gif) |
stugray |
Jan 26 2011, 03:25 PM
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#7
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I will eventually have new Hoosiers, but the first year will probably be used racing tires.
So I'll do the tube method. Thanks Eric! Does anyone have a picture of one that has failed? I would be interested in seeing that. |
Loser_Cruiser |
Jan 26 2011, 03:32 PM
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#8
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Member Group: Members Posts: 407 Joined: 4-April 05 From: Bellingham, WA Member No.: 3,873 Region Association: Pacific Northwest |
Eric- So are you still doing trailing arm services? I thought I read awhile back that you stopped.
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Eric_Shea |
Jan 26 2011, 04:07 PM
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#9
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PMB Performance Group: Admin Posts: 19,278 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
I stopped doing 5-lug but I can still do the control arm mods. I seemed to find a reliable machinist as well so... some 5-lugs may trickle out. We'll see. (IMG:style_emoticons/default/wink.gif)
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McMark |
Jan 26 2011, 10:06 PM
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#10
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
There is a VERY long thread on here somewhere which includes FEA for stock and modified trailing arms.
Most people don't need any stiffening on their trailing arms. Stiffen your chassis first, second, third and fourth. |
strawman |
Jan 26 2011, 11:46 PM
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#11
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Senior Member Group: Members Posts: 881 Joined: 25-January 08 From: Los Osos, CA Member No.: 8,624 Region Association: Central California |
Gotta agree that the trailing arm clamshells add a lot of weight. I welded on a set, compared them to a spare set stock ones and was amazed at how much heavier the reinforced ones are. Pretty porky, and unsprung weight at that. I ended up plagiarizing Eric's suggested tube reinforcements (thanks!) on my spare set...
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