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> Custom Suspensions, Need info on Dual A-Arms or 5Link setups?
914_1.8t
post May 6 2011, 06:07 PM
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So, I'm in the process of aquiring a 914 project and am trying to plan as far forward as possible, In particular the suspension.

Plan is to modify the trailing arms and turn them into either a 5-Link suspension or uneven length A-Arms. I'm looking for any pics or details on those who have gone this route.

In particular, with an dual A-Arm setup in the rear, what lengths/angles should I use for the A-Arms? What about 5-link? I know the question is a bit vague and I don't have many details at the moment but I'll be working towards finalizing something soon. Appreciate any feedback and PICS.
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VaccaRabite
post May 6 2011, 06:12 PM
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Are you going tube frame or something?

What you are describing is... not easy.

Zach
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914_1.8t
post May 6 2011, 06:18 PM
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QUOTE(Vacca Rabite @ May 6 2011, 05:12 PM) *

Are you going tube frame or something?

What you are describing is... not easy.

Zach

Yes, tube frame and not expecting easy (IMG:style_emoticons/default/smile.gif)
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bondo
post May 6 2011, 06:35 PM
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I wouldn't do the rear... unless you plan to put the transmission someplace else. (IMG:style_emoticons/default/smile.gif)
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914_1.8t
post May 6 2011, 06:51 PM
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QUOTE(bondo @ May 6 2011, 05:35 PM) *

I wouldn't do the rear... unless you plan to put the transmission someplace else. (IMG:style_emoticons/default/smile.gif)

I'm thinking something along these lines:


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Chris Hamilton
post May 6 2011, 07:00 PM
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Where are those photos from?
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bondo
post May 6 2011, 07:41 PM
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Wow, somebody did it! (or at least started doing it)

I'm skeptical that by the time you make the compromises necessary to get it into the available space you would have any measurable performance benefit. Of course if you go mega-widebody anything is possible (IMG:style_emoticons/default/smile.gif)
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rohar
post May 6 2011, 08:45 PM
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I've thought of just grabbing one of these, some 1" 16 gauge and a welder. Move everything that's in the way and stick it in:

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.supermotors.net-9685-1304736318.1.jpg)

It's a touch wider than stock track but should fit nicely under flares. $300 at the local pick and pull. Maybe after the engine conversion is done.
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quadracerx
post May 6 2011, 09:03 PM
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So what is that suspension from? I cant really tell if it has provisions for the CV Shafts or what? But Im old and blind too....

Looks like fun though....

Steve
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bam914
post May 6 2011, 09:15 PM
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Looks like a Miata rear suspension
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rohar
post May 6 2011, 09:34 PM
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Yup, Miata. It's been a while since I worked on 'em, but from memory they should come pretty close to fitting around the 901 tranny. The locost guys have been working with miata rear suspension and worked up their own rear framing diagrams. I'll see if I can't find them.

Hubs might get a bit sketchy...
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andys
post May 6 2011, 09:44 PM
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If you graft in a Boxster suspension and 5 speed trans, it will bolt up to that 1.8T....if that's indeed the power plant you're looking to do. I seem to recall someone doing one, but was pretty secretive about it.

byndbad914 has a tube framed A arm suspended racer (with SBC). Though he recently re-configured the suspension, it originally had a 5 link rear.

Andys
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enderw88
post May 6 2011, 10:32 PM
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QUOTE(rohar @ May 6 2011, 08:34 PM) *

Yup, Miata. It's been a while since I worked on 'em, but from memory they should come pretty close to fitting around the 901 tranny. The locost guys have been working with miata rear suspension and worked up their own rear framing diagrams. I'll see if I can't find them.

Hubs might get a bit sketchy...



I have accurate drawings of the Miata front and rear suspensions in the drawings section of my website.
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rohar
post May 6 2011, 10:33 PM
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If I had unlimited funds, I'd go the boxster route. Use the boxster cross brace as a jig for a custom fit brace with the same suspension points contoured to the 914 chassis.

I'm already converting to an audi box so this seems the obvious next step.
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914_1.8t
post May 6 2011, 11:23 PM
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QUOTE(Chris Hamilton @ May 6 2011, 06:00 PM) *

Where are those photos from?

Think I got them from this site some time ago?

I'm trying to look at other cars to figure out how to design it...trying to find software online that is cheap and free with no/minimal luck. Theres Wingeo3 but susprog3 but they are not free/cheap.

Basically plan so far is to modify the trailing arm as in the pics and figure out suspension geometry from there...legth/angle of upper and lower control arms in order to get good handling. Was hoping someone may have gone this route and have some data.
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Jeff Hail
post May 7 2011, 12:21 AM
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Go for it!!

Boxster rear suspension with the crossmember can be adapted to fit a 914 with substancial modifications. All considering it is an extremely light weight add on and the geometry is within par for the 914. These can be obtained fairly cheap from P-Car dismantlers.

The front end is a different animal. Best investment is going with coil over shocks and ERP 935 setup. Not cheap but the best bang for the buck.
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914_1.8t
post May 7 2011, 11:36 AM
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QUOTE(andys @ May 6 2011, 08:44 PM) *

If you graft in a Boxster suspension and 5 speed trans, it will bolt up to that 1.8T....if that's indeed the power plant you're looking to do. I seem to recall someone doing one, but was pretty secretive about it.

byndbad914 has a tube framed A arm suspended racer (with SBC). Though he recently re-configured the suspension, it originally had a 5 link rear.

Andys

I had done the 1.8t swap about 5 years ago in my old...audi/vw long motors/trans can be mounted to boxster engine/trans. I actually used a pasat/a4 fwd teams last time with boxter cable shifter and early 911 axles & hubs (with spacer at trans). New setup will be 2.7t with single turbo/o1e 6spd.

Ideally, if like to able to find a spindle (dual a-arm type) to use (and find some oem axles) and possiblyuse stock a-arms , figure out the geometry and design the frame of the car around that.

Boxster may be best way to go?
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andys
post May 7 2011, 12:24 PM
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Doing a double A arm front suspension takes quite a bit work to get everything to work in concert. If you retrofit an existing stock suspension from car X, you may be limited with making adjustments which might evolve into significant mod's later on. An adjustable suspension would be far more forgiving and lend itself to moving things around to get the right geometry. You might look at the A arm offerings from UBC Machine (stock car stuff, and it's cheap.). That said however, I might be inclined to stay with the stock Porsche front strut to keep things simple. A lot delends on your goals, IMO.

Andys
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roadster fan
post May 7 2011, 02:16 PM
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QUOTE(Chris Hamilton @ May 6 2011, 06:00 PM) *

Where are those photos from?


Those pics are from member Slugmika's build of his 914 race car. The thread is here: slugmika build

Has some interesting fabrication and suspension stuff on that car.

Jim
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Dave_Darling
post May 7 2011, 04:49 PM
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Someone has put a 993 rear suspension, complete with subrame, into a 914 before. I think it may have been Ron Mistak in his 911GT-1 clone 914-6 racer. It was pretty darned cool, and the cast aluminum subframe is unmistakeable.

--DD
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