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tubular subframe and control arms
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90droptoproc
Member


Joined: 25 Jan 2005
Posts: 490


1989 Chevrolet Camaro RS

PostPosted: Wed Oct 11, 2006 12:20 am    Post subject: tubular subframe and control arms Reply with quote

hey guys, I am in the middle of working with a fabricator over here on some tubular parts for my car, it looks like he will be very affordable, and he builds roadrace cars at his shop so I trust his craftmanship.

he will be working with me to build jigs so this is a repeatable item, is anyone else interested at all, I may be able to work out a nice price for us

so far we will be making:

tubular front cross member
lower control arms (made to work with stock spring setup, not coilovers)

it will all be much lighter then stock, stronger, and give you lots more room in the engine bay

the crossmember will work with stock A-arms and vice-versa

anyone interested in this stuff? let me know thru PM's and I will see if we can get a price from him

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QwkTrip
11sec Club


Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Wed Oct 11, 2006 1:11 pm    Post subject: Reply with quote

How much is he charging. Not sure if you've shopped around yet or not, but tubular K-members cost a little over $300.
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izcain
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Joined: 09 Sep 2006
Posts: 1306
Location: Port Angeles WA

1983 Chevrolet Camaro Z/28

PostPosted: Wed Oct 11, 2006 4:41 pm    Post subject: Reply with quote

Where are you finding tubular K-members for 300? I see spohn's is about 500.....
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Wed Oct 11, 2006 4:43 pm    Post subject: Reply with quote

Its all about the design. IF you can design it with enough lateral support, there could be a market. I won't put any of the current ones, on my car. heck I wouldn't even put them on Mikes car. Wink.

EDIT...izcain, I think he is talking about PA racings, or AJE's. They are probably cheaper tha Spohns.
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izcain
9sec Club


Joined: 09 Sep 2006
Posts: 1306
Location: Port Angeles WA

1983 Chevrolet Camaro Z/28

PostPosted: Wed Oct 11, 2006 5:12 pm    Post subject: Reply with quote

So you wouldn't even recommend spohn's then dewey?
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RSFreak
The other "John"


Joined: 23 Jan 2004
Posts: 2946
Location: Renton

1989 Chevrolet Camaro RS

PostPosted: Wed Oct 11, 2006 5:35 pm    Post subject: Reply with quote

Art Morrison has tubular control arms, A-arms, cross members etc... for thirdgens and they are right down the road in beautiful Fife, WA! I haven't checked pricing lately, but as I recall they were comparable to Spohn.
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QwkTrip
11sec Club


Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Wed Oct 11, 2006 7:57 pm    Post subject: Reply with quote

I would consider a tubular K-member for weight reduction only. If you want to corner then keep the factory piece.

PA Racing has a mild steel K-member starting at $289. Adding SB Chevy motor mounts and spring perches bumps it up to $389. Or you can forget the spring perches and use the adjustable coil over kit. They also have a "road race" option for another $150. Not sure what that means. You might give them a call and find out.

www.paracing.com

I have a PA Racing chromoly K-member with spring perches and a 2-inch drop cross support to protect large sump oil pans. Brand new and never used. I would sell it for $400 plus shipping. It's one of the few parts that I am willing to part out from the car.
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Wed Oct 11, 2006 9:22 pm    Post subject: Reply with quote

izcain wrote:
So you wouldn't even recommend spohn's then dewey?


Not for the way I use my car. If I was building a drag race only car, that would see very limited street time, I would do it for the weight savings, or if I needed extra room for some reason. But I don't know that you save that much, the factory peice does not weight all that much.
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izcain
9sec Club


Joined: 09 Sep 2006
Posts: 1306
Location: Port Angeles WA

1983 Chevrolet Camaro Z/28

PostPosted: Wed Oct 11, 2006 9:44 pm    Post subject: Reply with quote

After looking @ it, it would seem that the engine mounts are not going to be as strong as a stock k-member they look like they are just plates welded to the member wheras the stock k has them mount right to it. I think Tubular A-Arms is where Im headed next.
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Twilightoptics
Hardcore (12sec Club)


Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Wed Oct 11, 2006 10:24 pm    Post subject: Reply with quote

I can vouch for the stocker K member being pretty light based on metal size and how easily it dents Rolling Eyes
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90droptoproc
Member


Joined: 25 Jan 2005
Posts: 490


1989 Chevrolet Camaro RS

PostPosted: Thu Oct 12, 2006 12:15 am    Post subject: Reply with quote

the idea with this is to have one that can withstand street use, and hard driving, so far spohn's may be the only one that might be comparable, if it is up to the challenge
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Schultzy89GTA
M.R.A. (11sec Club)


Joined: 08 Jan 2004
Posts: 4417
Location: Gresham, OR

1989 Pontiac GTA

PostPosted: Thu Oct 12, 2006 8:56 am    Post subject: Reply with quote

I think that this is on topic... I would like to understand why these K member would not be good for anything other than straight line. I am in no hurry to get one several of you are aware of the clearance (or lack thereof) between my K member and the larger Moroso oil pan. I was wondering if the smaller cross section of these aftermarket K members would open up more area for the exhaust to cross over from the driver side.

Thanks,

-Schultzy
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izcain
9sec Club


Joined: 09 Sep 2006
Posts: 1306
Location: Port Angeles WA

1983 Chevrolet Camaro Z/28

PostPosted: Thu Oct 12, 2006 9:01 am    Post subject: Reply with quote

From what i have seen and heard it will open up all sorts of clearance for exaust and oil pans. I have yet to try one though to see for myself..... I too have the moroso deep sump with trap door. It is close but I still have a pretty decent amount of clearance.
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Thu Oct 12, 2006 9:02 am    Post subject: Reply with quote

the problem is, they way they are built they are not very strong an multiple directions, they all have a single tube that ties things together, they need a better designe, with some triangulation and more then 1 cross tube, to make it stronger with twisting, and bending foces, that the K-member will see when you are doing lots of cornering. I also question their strength on a car that takes lots of impacts, such as a daily driven car, that has to deal with pot holes and such.
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Schultzy89GTA
M.R.A. (11sec Club)


Joined: 08 Jan 2004
Posts: 4417
Location: Gresham, OR

1989 Pontiac GTA

PostPosted: Thu Oct 12, 2006 9:08 am    Post subject: Reply with quote

Thanks John. The sled will definitely be thrown into the twisties. Not interested in anything that will weaken that capability.

-Schultzy
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izcain
9sec Club


Joined: 09 Sep 2006
Posts: 1306
Location: Port Angeles WA

1983 Chevrolet Camaro Z/28

PostPosted: Thu Oct 12, 2006 9:09 am    Post subject: Reply with quote

After looking @ the motor plates I dont think I would want to strap my stroker motor to that and launch @ 4k off the transbrake with the gas flowing.... Something tells me it just wouldn't hold but im sure it has held for plenty of others.
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Xophertony
Rodeo Queen


Joined: 13 Oct 2005
Posts: 5306
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Thu Oct 12, 2006 9:13 am    Post subject: Reply with quote

it's the control arms that scare me. on TGO i have seen a few posts where they just break. redraif (the chick with the v6 firebird that looks like it went on a JCwhitney shoping spree) broke one just daily driving. the spring perch just brke out of it at 45 MPH Shocked
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Schultzy89GTA
M.R.A. (11sec Club)


Joined: 08 Jan 2004
Posts: 4417
Location: Gresham, OR

1989 Pontiac GTA

PostPosted: Thu Oct 12, 2006 9:27 am    Post subject: Reply with quote

Rich,
To get back to your original question, I would be interested but it would have to be a proven product before I would be willing to participate. Let me know how things progress.

-Schultzy
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Twilightoptics
Hardcore (12sec Club)


Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Thu Oct 12, 2006 9:47 am    Post subject: Reply with quote

More cross tubes? What about metal and a welder Cool

I'm 3/4 of the way done with my tig class, and we haven't even reached the halfway point. Wink
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Thu Oct 12, 2006 9:55 am    Post subject: Reply with quote

haha, I have a copy of SolidWorks on my computer at home. We could design in, and some testing on, get a good FOS on it, and go to town.

I bet, we find out, that for the strenght, the GM design is going to be the lightest design we can find.
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