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Convert a 931 to 924S rear trailing arms
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Dutch924-racer  



Joined: 23 Jul 2007
Posts: 1060
Location: The Netherlands

PostPosted: Wed May 21, 2008 4:48 pm    Post subject: Convert a 931 to 924S rear trailing arms Reply with quote

I want to convert my 931 (1982) to 924S rear aloy trailing arms

What do I need besides the trailing arms. I saw in pet that the strut is also different (951 333 021 00).

And will my 931 calipers en discs fit without modification ?
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gegge  



Joined: 27 Jul 2007
Posts: 1077
Location: Sweden

PostPosted: Wed May 21, 2008 8:28 pm    Post subject: Reply with quote

You need the longer axles(bearings, CV joints?). Don┤t know it you use the handbrake, but that one is different as well.
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vexed73  



Joined: 05 Oct 2007
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PostPosted: Wed May 21, 2008 9:27 pm    Post subject: Reply with quote

Not trying to sound dumb but why switch?
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ideola  



Joined: 01 Oct 2004
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Location: Woodstock IL

PostPosted: Wed May 21, 2008 10:20 pm    Post subject: Reply with quote

The alloy suspension setup is MUCH lighter than the stock 5-bolt steel setup on the 931. Don't know the exact weight difference, but I know I can lift a complete alloy suspension assembly and move it around no problem, while the steel setup was barely doable with a piano dolly. Plus if you get the 87- 951 setup, you can get the late offset and the 951 4-pot calipers OR bolt-on any of the aftermarket 951 big brake upgrades.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11378
Location: PacNW

PostPosted: Thu May 22, 2008 1:28 am    Post subject: Reply with quote

951 Brembo calipers should bolt up to any rear disc setup.

I was just looking at this. Here is what I came up with:

Trailing arms
Spring plates
Axles
Stub axles
Handbrake cables
Brake hard lines

Trailing arm, torsion mount, and spring plate bushings should all be replaced while apart. T-bars too, if you want to stiffen the rear.
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Toofah King Bad

  • Red (1987 924S) - Pro44/Spec944
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Dutch924-racer  



Joined: 23 Jul 2007
Posts: 1060
Location: The Netherlands

PostPosted: Thu May 22, 2008 5:10 am    Post subject: Reply with quote

mm, thats a lot to change.

One of the reasons i want to change is for coilovers and get the torsion bars out.
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ideola  



Joined: 01 Oct 2004
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Location: Woodstock IL

PostPosted: Thu May 22, 2008 12:13 pm    Post subject: Reply with quote

If you're changing/removing the torsion bars anyway, it's not that big of a deal. Just get the entire rear suspension assembly and be done with it. I have two awaiting installation, one for the UWB project, and one for Sparky if he still wants it...
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11378
Location: PacNW

PostPosted: Thu May 22, 2008 6:13 pm    Post subject: Reply with quote

Coilovers require a cage. The body lacks necessary reinforcement to support the weight of the car at the upper shock mount.
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Toofah King Bad

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tuurbo  



Joined: 08 Aug 2007
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Location: East Windsor, New Jersey

PostPosted: Fri May 23, 2008 12:45 am    Post subject: Reply with quote

Why do you want to change it? Like why do you want the torsion bars out and so on? Is it failing to perform with your current driving?

I read Ideola's reasons and for a guy like him who's making a monster, ok, I can see why if you're investing thousands into a monster project you might as well go all the way for an UBER track car, but...for a normal car it seems like a lot of bs. Even for a track car I'm just kind of surprised that the Porsche setup is insufficient.
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Rasta Monsta  



Joined: 12 Jul 2006
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Location: PacNW

PostPosted: Fri May 23, 2008 1:39 am    Post subject: Reply with quote

tuurbo, the conversion is not that big a deal. I got t-bars used for $125, and am getting the aluminum arm setup for $100 from a friend's parts car.

As for the sufficiency of the factory setup, those rubber bushes aren't likely to be in the condition they were when they left Deutschland. . .
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Toofah King Bad

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tuurbo  



Joined: 08 Aug 2007
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Location: East Windsor, New Jersey

PostPosted: Fri May 23, 2008 1:44 am    Post subject: Reply with quote

Fair enough - I don't drive my car hard enough to really notice any problems I guess.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11378
Location: PacNW

PostPosted: Fri May 23, 2008 2:50 am    Post subject: Reply with quote

Well, and that is also fair enough. Your rear bushes are probably OK for light touring, but I take Shaggy on the track, and also on PCA "Arrive and Drive" tours, so I want his handling at its best. . .I have C4Ses to show up!


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Toofah King Bad

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ideola  



Joined: 01 Oct 2004
Posts: 15505
Location: Woodstock IL

PostPosted: Fri May 23, 2008 12:05 pm    Post subject: Reply with quote

Rasta Monsta wrote:
I have C4Ses to show up!

Hear hear!!!
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CÚdric  



Joined: 27 Aug 2004
Posts: 1985
Location: Sweden

PostPosted: Fri May 23, 2008 5:16 pm    Post subject: Reply with quote

No you dont need a cage for coil overs. There are a bunch of 944 and 924 owners over here that run coil overs on steel trailing arms. It do need some modification, at least with this bits.




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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Sat May 24, 2008 1:44 am    Post subject: Reply with quote

Good luck with that. I'd be checking for cracks after every track event.
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Toofah King Bad

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