Fox body road racer - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 18 Old 05-16-2018, 03:56 PM Thread Starter
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Fox body road racer

Has anyone every put a C4 corvette front suspension under a foxbody? It's 4 inches too wide but can be narrowed and a different rack used.

From what I read it's a good SLA set up.

Purists need not reply. I'm looking to go faster.

Thanks in advance.


Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily

Last edited by jmdoc66; 05-16-2018 at 03:58 PM. Reason: additional text
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post #2 of 18 Old 05-17-2018, 09:52 AM
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Never heard or seen this, due share tho, also vettes use that leaf spring setup, youd have to mod that as well.


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post #3 of 18 Old 05-17-2018, 10:09 AM
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You'd almost be better to utilize the UCA and LCA and spindle. Then modify your chassis to make it work.

Most SLA setups utilize the SPC upper control arm that A bodies use. They just create an upper mount off the nut plates for the K member bolts. The trick is locating it all in correct geometry.
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post #4 of 18 Old 05-21-2018, 12:01 PM
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I guess the question is how good are your fabrication skills? I also agree that making custom mounts for the UCA and LCA is probably the way to go, but will require some skill in locating it to maintain proper geometry.

There are bolt in solutions, but ouch on that price tag.
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post #5 of 18 Old 05-21-2018, 05:30 PM Thread Starter
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So can someone tell me why shortening the C4 corvette front crossmember 4 inches so it fits under the fox body is not a good idea.
I know the ackermann angles will be off, but what else?

I'm asking for input.

Everyone complains about how expensive SLA's are, I'm looking for an alternative.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #6 of 18 Old 05-22-2018, 05:54 PM
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Why not just buy a C5 and have a proper road racing car instead of trying to coble an economy car designed in 1977 into a competent racing car?

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post #7 of 18 Old 05-22-2018, 08:54 PM
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Quote:
Originally Posted by Stew_Magoo View Post
Why not just buy a C5 and have a proper road racing car instead of trying to coble an economy car designed in 1977 into a competent racing car?

Because anyone can do that......dare to be different. I would love to see and hear about the results if the OP goes the new front end route in the square, old, clunky, bad ass sounding, challenge of a race car, has fun with it and gains pavement on a few newer, more expensive rides.

Good luck and post up.

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post #8 of 18 Old 05-22-2018, 10:26 PM
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DIfferent is cool and all, but you get to a point of diminshing returns. I don't see some cockamammy DIY Corvette hybrid front susmension as being a viable option for cool points, or proper handling.

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post #9 of 18 Old 05-23-2018, 12:29 PM Thread Starter
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Hey Stew,

Thanks for giving your opinion even though no one asked for it. I think I can speak for at least a couple people on this thread, when I say I(we) really don't care if it's 'cool' or proper by your standards.

So, unless you have something positive to add to this thread, please keep your opinions to yourself.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #10 of 18 Old 05-23-2018, 01:17 PM
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post #11 of 18 Old 05-23-2018, 04:45 PM
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Quote:
Originally Posted by jmdoc66 View Post
So can someone tell me why shortening the C4 corvette front crossmember 4 inches so it fits under the fox body is not a good idea.
I know the ackermann angles will be off, but what else?

I'm asking for input.

Everyone complains about how expensive SLA's are, I'm looking for an alternative.
Quote:
Originally Posted by jmdoc66 View Post
Hey Stew,

Thanks for giving your opinion even though no one asked for it. I think I can speak for at least a couple people on this thread, when I say I(we) really don't care if it's 'cool' or proper by your standards.

So, unless you have something positive to add to this thread, please keep your opinions to yourself.

I'm sorry I offeneded you by offering my input after you asked for peoples input. My bad.
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post #12 of 18 Old 05-24-2018, 08:31 AM
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I think you'd be better off avoiding the cross member entirely and just use it as a jig rather than fabbing it to fit the chassis. It seems to me you'd be wiser to take the UCA and LCA mounting locations geometry and retrofit that to your chassis. The cross member would only be a reference guide to properly map the geometry.

Or

Use the wealth of information available on DIY SLA setups, and develop your own bracket using the SPC upper control arms. There's some serious software available to aid you in dialing in where and what to build for the UCA mounting location. You'd only need to find the Strut brackets to provide an UCA ball joint locations. This way you wouldn't have to fool with a different rack or GM parts on a Ford.
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post #13 of 18 Old 05-24-2018, 05:11 PM Thread Starter
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Your Right Stew, your comments added value to the conversation of how I'm going to fit a SLA to my track car. Troll.

Quote:
Originally Posted by Stew_Magoo View Post
DIfferent is cool and all, but you get to a point of diminshing returns. I don't see some cockamammy DIY Corvette hybrid front susmension as being a viable option for cool points, or proper handling.
I know its hard for you to understand, but I'm looking for someone with a little bit of engineering background to comment on the disadvantages of fitting a cockamammy Corvette SLA to my track car.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #14 of 18 Old 05-24-2018, 05:50 PM Thread Starter
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Mr. Thenemesis,

I haven't been able to find much more than pictures of DIY SLAs. Have any good links? I would greatly appreciate it.

As far as the SPC upper arms, I see they are pretty popular, but once again I was unable to find any good builds for mustangs.

Thanks in advance.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #15 of 18 Old 05-24-2018, 08:16 PM
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Originally Posted by jmdoc66 View Post
Mr. Thenemesis,

I haven't been able to find much more than pictures of DIY SLAs. Have any good links? I would greatly appreciate it.
https://m.imgur.com/a/MJEkU

Unfortunately it's just another link to pics without more info, but this gentlemans build is a bit unique and incorporates an explorer Front suspension and cantilever suspension.

I know not the road racer you are looking for, but more information to give you ideas

Mike
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post #16 of 18 Old 05-25-2018, 09:59 AM Thread Starter
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Thank you sir.

I did see this guys post and I also couldn't find anything else other than pictures.

I did see he used the explorer spindles. It gives me an idea to maybe use a different spindle such as a crown vic and to take a closer look at the Lincoln LS front SLA.

One limiting factor with the C4 vette front end is the length of the control arms. They're 16 inches, or that's the figure I come up with when I take the track width (60") minus the cross member mount points(28"). With the smaller track width of the mustang, (56"), that means the cross member mounting points will have to be 2 inches inboard each side or 24 inches. The stock frame width of the fox body is 32".

Narrowing the frame a total of 8 inches will cause the engine to be raised. That is one thing I do not want to do.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #17 of 18 Old 05-25-2018, 10:14 AM Thread Starter
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I looked again and the inside of the frame has to be 28 inches, not the outside. So that means I only have to pull the frame in 2 inches per side.
I have a fox body firewall forward frame section, so I'll take pictures later.

One thing about an SLA, the shock towers will be removed. This may give a couple inches of more room for the headers.

Also, the inside of the frame needs to be 28 inches, and with the length of the a-arms, the turning radius may not be affected much by 'stepping' the frame in to mount the upper control arm and the cross member.

I do realize fitting the C4 suspension inside the fenderwells is only the very top of the box of worms, but one step at a time. There is a good chance none of the factory parts from C4 will be left by the time I get done.

The messurements I've found leaves the question, would the stock C4 front suspension be good for a new edge or S197 mustang SLA. Both of which are very close to the track width of a C4 vette. All you need to do is get a Coil Over set up and figure out the rack and pinion.

Doesn't matter who makes it, as long as it's fast!
'99 Saleen S/C 281, 2007 Shelby Gt (track whore), 2010 427R daily
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post #18 of 18 Old 05-29-2018, 11:22 AM
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jmdoc66,

You really need to post your question over at GRM. You will fit in just fine if you are not already a member, they are even in Florida.
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