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> Raised Trailing Arm Pickup Points, Pictures of my progress
ChrisFoley
post Jan 20 2004, 09:53 PM
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I finished welding the driver's side today.


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ChrisFoley
post Jan 20 2004, 09:54 PM
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View from the engine comp. side.


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ChrisFoley
post Jan 20 2004, 09:57 PM
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Yesterday I had the trailing arm attached to line everything up before welding.


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ChrisReale
post Jan 20 2004, 09:59 PM
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Nice work, Looks solid (IMG:style_emoticons/default/smilie_pokal.gif)
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ChrisFoley
post Jan 20 2004, 10:00 PM
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Pickup points are raised 3". Everything is based on the stock pivot shaft and stock system of alignment.
This pic shows the piece I fabricated to hold the trailing arm, after tack welding in place.


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Gint
post Jan 20 2004, 10:03 PM
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914 porn...

Nice work Chris. Thanks for posting the pics.
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ChrisFoley
post Jan 20 2004, 10:03 PM
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This pic shows the ride height of my car. The top of the I-beam is the theoretical ground level.


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ChrisFoley
post Jan 20 2004, 10:05 PM
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The front A-arms are nice and flat. Note the bolt head that just clears the 3" square tube.


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ChrisFoley
post Jan 20 2004, 10:09 PM
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I set up the car on my platform and aligned everything with the car suspended on the springs/torsion bars at my planned ride height.


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drew365
post Jan 20 2004, 10:22 PM
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Chris; your workmanship looks great. Please humor me, what are you trying to accomplish by raising the pivot point?
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Eric_Shea
post Jan 20 2004, 10:29 PM
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Awesome... so, what gauge metal is on a 914? (IMG:style_emoticons/default/smile.gif)
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ChrisFoley
post Jan 20 2004, 10:30 PM
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QUOTE(drew365 @ Jan 20 2004, 11:22 PM)
what are you trying to accomplish by raising the pivot point?

A National Championship!! (IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/beer.gif)

More to the point, better grip, through improved suspension geometry.
The car is drastically lowered for better CG.
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URY914
post Jan 21 2004, 06:37 AM
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Chris,

Will this mean your shock and spring will need to be shorter?

And will the halfshafts be horizonal between the gearbox and the trailing arms?

Paul
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URY914
post Jan 21 2004, 06:40 AM
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Is your wheel travel reduced or do you raise the top of the shock too?

Just wondering how everything will change from raising the pivot point.

Paul
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ChrisFoley
post Jan 21 2004, 07:31 AM
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Eric,
The long. frame in that area is a double layer of approx 18ga. The inner layer starts right there and extends forward just past the jack post.
I used both 16ga and 14 ga to box in the 1/8" square tube bracket I made, after welding the bracket fully to the existing metal.

Paul,
I plan to use stock length shocks for the time being. The springs are 10" x 2.5", 250#. The top mount is already raised, using the custom pieces I have shown on my website. I may modify this area again, as I think there is room to go up a little more. (IMG:style_emoticons/default/smile.gif) I haven't measured the remaining shock travel yet as it sits now. I think the angle of the halfshafts is higher at the wheel end. (IMG:style_emoticons/default/blink.gif) The front shocks have about 2"" of travel remaining.
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groot
post Jan 21 2004, 08:07 AM
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Chris,

Excellent fabrication.

We should compare notes. I'm working on a 914 SCCA production racer, too, for a while now. The big difference is you've been racing yours for a while I've been running an ITB car.... and I'm jealous. My 914 has only been to auto-x's.

Here are some of my notes:

I'm been redoing the front suspension on my 914 with the goal of improving geometry. I'm going to toss the control arms and use 2 tubes on either side with rod ends on both ends of each tube. I wrote a little spreadsheet program that calculates roll centers under different conditions and concluded that I need to extend these tubes to the center of the car and make them level at ride height.

The only thing I was doing to the rear was to fabricate some sperical bearing mounts on the chassis and plug the trailing arm with threaded plugs....... and make sure I've got enough travel to align toe and camber.

Now, to my point.... Given that in production we have to stay with the "same type" of suspension that came on the car. In the rear, we're stuck with a trailing arm setup. Everything I read says there's not much one can do to improve it, unless you lengthen it significantly to reduce the wheelbase change with travel. Is that what geometry you're trying to improve? or have I missed something?

Thanks,
Kevin
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John Kelly
post Jan 21 2004, 02:08 PM
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Hi Chris,

Nice work! Wish I was closer...I would rent your rack when you are done instead of having to make my own.

John www.ghiaspecialties.com
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ChrisFoley
post Jan 21 2004, 08:11 PM
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I welded up the passenger side today. It was a little tougher because I didn't remove the quarter panel.


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redshift
post Jan 21 2004, 08:19 PM
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oh my god dood that rocks!

(IMG:style_emoticons/default/pray.gif)


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TimT
post Jan 21 2004, 08:34 PM
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Chris, scribble me in your appointment book for next fall (IMG:style_emoticons/default/driving.gif)
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