924Board.org

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

These popped up the other day on Pelican. VERY interesting! Although, I would only be interested if they can be made to accommodate the sway bars. But nice looking alternative, and priced right too (when compared to the other aftermarket alternatives or new-from-Porsche).
http://forums.pelicanparts.com/showthread.php?t=498907

Scorpio · Posted: Thu Sep 17, 2009 10:43 pm Post subject:

They look very nice Dan, but what exactly makes them superior? im guessing some slight weight savings?..not sure if theyde be worthy of the $825 shipped tag, or did he miss a decimal there?
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

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

Scorpio · Posted: Thu Sep 17, 2009 11:04 pm Post subject:

well i cant really comment as i have next to no experience on the issue of a-arms...except for the fact that i drilled out rivets from my old ones and bolted in new ball joints, oh and welded some brackets for the bar thingy

Sounds like you know what youre talking about so make like Nike and..Just do it..

_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

i'd love a set...but 825...what the hell? for that money i can get a complete late 951 suspension..front and rear.
i'd be willing to pay a maximum of 300 euros for a set...shipped.
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Supercharger and EFI kits
https://www.the924.com

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

Comparing apples to oranges.
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erstwhile owner of just about every 924 variant ever made

Rocco R16V · Joined: 03 May 2009 Posts: 497 Location: PNW

Those are very cool!
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Min · Posted: Fri Sep 18, 2009 9:26 am Post subject:

My problem with these arms is there is no way to know what kind of actual engineering went into designing and producing them, they are highly modified rx7 a-arm's, but did the person making them do any sort of testing on them? load analysis? anything? or did he just slap a couple of cnc machined bits onto a rx7 a-arm and call it good?

Min
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Custom means it didn't come from a box.
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ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Some of those questions are answered in the cross-referenced thread. To avoid the appearance of defending this product, I won't repeat it all here. I just found this to be an interesting alternative and thought I'd pass it along.
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erstwhile owner of just about every 924 variant ever made

Min · Posted: Fri Sep 18, 2009 2:26 pm Post subject:

Well, I read the whole post in the link you posted, I saw nothing that answered any of my questions. As far as I'm concerned an a-arm is a critical load bearing piece of your suspension. Even the grain of the cnc machined pieces could have an effect on the capabilities of that material. If they are cut incorrectly they will have a far smaller yield strength. I'm not trying to nitpick his product, I'm just saying, buyer beware on this one, a rx7 has completely different requirements than a 924/944 does, and unless you've done the math, you can't be sure its a safe product. I'd like to see the sellers calculations if he has done the math.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

flosho · Posted: Fri Sep 18, 2009 4:50 pm Post subject:

What math is all involved. You have to look at the overall length the a-arm extends, which is adjustable for early offset and late offset. Then if the bushings are in the same spot, as long as the A-arm sits parallel or better (meaning the outer most part of the a-arm is lower to the ground then the chassis side) then the geometry should be the same.

It looks like a nice piece of work, but the profit margin on this must be HUUUUUUUUUUGE.. I bet it doesn't cost more than $100 per side...
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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

exactly...i dont know why he is askin that wopping 800+
if those are mazda arms then all he is asking 800+ for is that CNC part? c'mon !!
if the 800 price was to be sustained by something it would be by endless tests on this product that guarantee that it will not break and work the same or better than the stock arms...wich is not...or it appears not to be..

i've got one question...that CNC part that goes from the alu arm to the balljoing....uses two holes in the alu A arm...were the holes there in the first place or were they drilled by the guy? if they were drilled i'd be concerned about aluminium giving away there...cracking and ultimately dezastrous failure.
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Supercharger and EFI kits
https://www.the924.com

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

From a $20 ebay purchase:

And less than $50 worth of aluminium, ball joints and bolts.

To a $825 example of dubious back shed engineering:

Doesn`t look like rocket science.
Does appear to be an excellent profit margin.
Definitely do not want to be a crash test guinea pig for these. Not healthy at suburban speeds, likely fatal at highway speed and absolute suicide at Northern Territory (unlimited) speeds.

Perhaps after many years of track evaluation and road use by gamblers with a spare $800.

Only then maybe you could consider knocking some up one Sunday afternoon or getting a local machine shop to do it for a fraction of the OP`s price.

bass gt · Posted: Sat Sep 19, 2009 12:45 am Post subject:

Guy's,

sorry but I'm with min on this one. Forget the CNC bar, you are asking the front of the car to be supported on two bolts!!! If just one fails, the other will suffer catastrophic failure quickly followed by your car suffering the same!!
These belong firmly in the trash can!!

Steve
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Front Wheel Drive is the Devil's work.

flosho · Posted: Sat Sep 19, 2009 1:38 am Post subject:

What if the CNC part followed the curve of the A arm to the rear bushing part. Then you could have it bolted in 8 or 10 spots.
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