924Board.org

peterld · Posted: Wed Mar 24, 2010 1:09 am Post subject:

Yeah, now what about the trailing arms?

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80/81 932/8 ROW

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

peter? I weighed the entire trailing arm assemblies with brake hardware included. So we have an aluminum arm with disc brakes and a steel arm with drum brakes, I found 4 lbs difference.

I just didn't have a steel trailing arm with disc brakes to weigh, or I'd have had a measurement for that as well. Maybe Rasta has one I can borrow for a quick scaling.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

Khal · Posted: Wed Mar 24, 2010 3:59 am Post subject:

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Well, I stepped on the scale about 2 months ago before I started on a health regimen and it said 215, now it says 200lbs and I've tightened my belt another notch.

I did actually test it and calibrate it some a while back with some dumbbell weights and it was fairly accurate to what the weights were rated at. I'd trust it to at least 1lb +/-
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

!tom · Posted: Thu Mar 25, 2010 1:33 am Post subject:

I've got the parts to do a 5-lug conversion, complete with some beat up steel arms that I'm not intending to use. I'm in no position to weigh the drums though, as they're still on the car.

If nobody does it sooner, I hope to embark on this project this summer and can try to remember to weigh things then.
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78 924 NA
5-lug

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

You forget about the fact the the disc brakes have an internal drum brake mechanism on top of the large chunk of rotating steel attached to said drum.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Having lifted and moved complete rear suspension assemblies of both configurations, it sure seemed to me that the steel based versions were heavier. But, perception is NOT reality, and it could have been psychological, so better to stick with empirical facts. Unfortunately, don't have one of either around intact and loose from a car at the moment to verify.

In any event, the guy over on Rennlist with that Sick-as-in-Schweet 944 project posted a verified weight loss document from his project in this thread. Since not everyone here has a Rennlist account, I downloaded the doc and uploaded it to my Google docs repository, which you should all be able to access. Something like this would make a great "collective" project if we could adapt it specifically to the 924. Something I may do when I get a spare moment, and make available for edits to any 924board member with a Google account.
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erstwhile owner of just about every 924 variant ever made

Mike9311 · Joined: 14 Dec 2004 Posts: 1798 Location: Chicago-ish

!tom · Posted: Sat Mar 27, 2010 6:59 am Post subject:

That would be helpful, but what people are more interested in is the entire brake assembly; shoes, drum, backing plate, wheel cylinder, etc. vs. disk, shoes, pads, caliper, caliper mount, shield, etc.

My drum brake assembly is still in daily use, and I have yet to dissassemble my disk brake assembly from some beat-up arms. I have everything needed to make this comparison myself except for the time (and shoes), and I plan on making time once I get the remainder of the kit (the shoes) from CBass.
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78 924 NA
5-lug

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Personally am keen to know the accurate TOTAL weight difference between a steel arm 5 lug and an ally arm 5 lug.

The more items and figures we get the more benefit for everyone.

Mike9311 · Joined: 14 Dec 2004 Posts: 1798 Location: Chicago-ish

I think we all should really start a collective weight thread. Each of us could be editing our own section as we add weighed items both as whole assemblies and as individual parts. I almost wish we could back out of this thread and start a sticky thread of the same title. I am looking at iron engine mount bracket right now in CAD and the properties function is kicking out over 2 kilos! I will actually weigh it of course when I get the chance. seems crazy

Sorry if I hijacked this thread but it is weight data for the collective

Edit adding link:

Performance from Weight Loss (Weight_Loss)
http://www.924board.org/viewtopic.php?t=3648&highlight=headers
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK