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Jack Olsen's Avatar
 
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Building a better Black Beauty #5: Rear Suspension Mounts

Sometimes it's the little things that make the biggest differences. Since 930 rear trailing arms would be too expensive (and then too expensive to replace), we decided to get some of the benefits of the 930 setup for my aluminum trailing arms. Hamlin Fabrication makes pieces that modify the mounting points for non-turbo 911 pivot boxes to allow easy at-track camber and roll center adjustment. They also (I'm told) dramatically improve rear suspension geometry to decrease squat tendencies, and easily accommodate very low ride heights and will not change toe settings.

I guess the rear seat is going to be less useful, now. On the bright side, it will be lighter once we put a (removeable) aluminum cover into the new space. Pelicanite Tyson Schmidt was responsible for putting it all together.

Can that kid weld, or what?











Old 12-17-2002, 11:34 AM
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Jack that is totaly cool, the first picture slide to help forward bite also? as in up is bit down is less and controls the roll center in the corner to tighten and loosen, thats some cool stuff, I use some simuloar stuff on my stock car, Kevin

Last edited by Kevin Stewart; 12-17-2002 at 12:28 PM..
Old 12-17-2002, 11:42 AM
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Yes. He can. And that's not all. His hands work very well, but not as well as his head.
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Old 12-17-2002, 11:51 AM
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Jack,

Impressive! Boy you are really going whole hog on this thing. Can't be cheap. How did they cut the rear seat area out so cleanly? Any rust in the rear seat area? Want to sell that section? Mine needs replacing.

Tinker
Old 12-17-2002, 12:19 PM
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Are you still sticking to your guns on the AC?

It looks more like a real track car with each step. Nice work Tyson.
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Old 12-17-2002, 12:23 PM
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SWEET GOD! all the goodies jack is getting placed on his car.... oh me oh my! how I want to do some of those tricks to mine..

Keep it up Jack My Boy your going to have a hell of a streeter/track monster..
Are ya slapping those Recaro seats andall back in there.. BTW how did those hold up in the impact did the shells show any cracks?

Eric mckenna
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Old 12-17-2002, 12:26 PM
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Jack I have no sound deadner in mine, and she is loud! but I'm ok with it love the sound to be honest! but your's is going to , well .. how are ya going to keep that thing at a level that you can hear the guy next to ya yell.. with tta back end all cut out or is going to be welded back in?
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Old 12-17-2002, 12:30 PM
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Beautiful! Perfect timing, just in time for x-mas! Can you use bushings in the trailing arm or do you have to convert to monoballs? Any pictures of the front mounts?

Thanks!
BK
Old 12-17-2002, 01:14 PM
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BTW - What have people found to be the cost of a couple of used Turbo "banana's"?

- John
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Old 12-17-2002, 01:15 PM
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Jeez Jack, as long as you've gone this far, a 6spd would slide right in there. Only half jesting here
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Old 12-17-2002, 03:32 PM
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This is going to be a pretty slow car. With all this perfection, Jack will be watching the walls instead of the track.
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Old 12-17-2002, 03:52 PM
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Question Jack

Quote:
Originally posted by JackOlsen
..........I guess the rear seat is going to be less useful.......
Just wondering about the order of the pics -
The first two pics show the seat in place with only the mount penetrations cut out?
The remaining show the entire seat base removed?
Are the first two pics with the seat base welded back into place?
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Last edited by Sean Hamilton; 12-17-2002 at 05:19 PM..
Old 12-17-2002, 04:54 PM
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Super, you've got to drive it like you want crash it.

And yes, Chuck, the AC is staying in. And no, Bill, I'm not springing for a six speed. I've already bought one set of custom gears. Five speeds is going to have to do it.

But part of what's being done here is to accomodate future improvements...

The seat piece came out in two stages. Nothing will be welded back in; it's too heavy. Instead, there will be an aluminum plate fitted in with quarter-turn fasteners. Carpet will be the only sound deadener, at least on the track. I'm thinking I could possibly put together a kind of custom-fitted blanket for the back for trips to the 7-11. We'll see how loud it is. The motor and the exhaust passed without any issues at Laguna, so we're not talking about an extremely loud car.

And yes, Wayns. i agree. I'm thinking these posts will provide a good review, if nothing else, to guide a complete tech article to accompany all the pictures.

Last edited by Jack Olsen; 12-17-2002 at 05:05 PM..
Old 12-17-2002, 05:00 PM
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Jack

Quote:
Originally posted by JackOlsen
..........The seat piece came out in two stages. Nothing will be welded back in; it's too heavy. Instead, there will be an aluminum plate fitted in with quarter-turn fasteners. .......
That's a big hole in a monocoque.
I would've reckoned that the seat area section would be providing a fair bit of lateral rigidity?
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Last edited by Sean Hamilton; 12-17-2002 at 06:39 PM..
Old 12-17-2002, 05:25 PM
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Sean, Jack didn't post all the pictures I took. I also added in some reinforcement to tie the center tunnel in to the torque tube. The rockers, center tunnel, torque tube, and shock tower cross-member are the main structural members in the rear.
The sheet metal for the seat buckets is flimsy and not a structural member, especially with it's shape. If it were a flat shear-panel, then it might add a little.

I started out cutting as small a hole as possible for the camber boxes. But then Jack showed up at the shop, and it was decided to cut it all out and cover it with a flat removable panel.
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Old 12-17-2002, 06:06 PM
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Quote:
Originally posted by Tyson Schmidt
I started out cutting as small a hole as possible for the camber boxes.
Yeah, I see that and it looked really neat.

Quote:
But then Jack showed up at the shop, and it was decided to cut it all out ..........
Oh, I see. I bet ya dread it when he does that!
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Old 12-17-2002, 06:47 PM
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Bump!

Everyone says that Turbo trailing arms are expensive. What sort of prices have people seen for used pieces? I'm just trying to consider the cost trade-off of going to turbo arms on my car versus using the regular aluminum pieces. Functionally the difference (compared to Jack's set-up) is that the shorter turbo arms increase the camber gain, but that may not be a big deal depending on how far the car leans.

Anyone?
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Old 12-20-2002, 06:33 AM
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I helped do the same work on a customer's car at the shop I used to work at. We cut the seats out as well and used "cam-locs" (I think they work better than any of the other fasteners out there) and be sure to bead-roll the replacement panel to help keep it from vibrating.

Looks great!
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Old 12-20-2002, 09:12 AM
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