Stock XR4Ti spring lengths?

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whitelx
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Stock XR4Ti spring lengths?

Post by whitelx » Thu Dec 06, 2007 5:30 am

Does anyone know the free length of the stock front and rear springs on the XR4Ti? That's the once piece of information I need and unfortunately everything is assembled right now so I can't get a measurement.
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
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John Brennan
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Post by John Brennan » Thu Dec 06, 2007 12:16 pm

By "free length," do you mean out of the car? You'd want to be sure they were "unsagged."
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Post by whitelx » Thu Dec 06, 2007 12:27 pm

John Brennan wrote:By "free length," do you mean out of the car? You'd want to be sure they were "unsagged."
yes, out of the car.
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
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Post by Grayson » Thu Dec 06, 2007 3:48 pm

Keep in mind the rear springs are not linear (nor are they progressive). They're dual rate. That may matter to you depending on what you're planning on doing with the spring length information.

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Post by Cpt_Danified » Thu Dec 06, 2007 4:54 pm

I should be getting some tomorrow. I can measure them for you. Do you need just the back or the fronts too?

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Post by whitelx » Thu Dec 06, 2007 5:39 pm

Cpt_Danified wrote:I should be getting some tomorrow. I can measure them for you. Do you need just the back or the fronts too?
I need the fronts, but the rear would be nice as well for reference.
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
http://www.youtube.com/user/whitelx

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Post by Stealth_xr » Thu Dec 06, 2007 7:41 pm

I got a set i was planning on cutting. I can measure them this weekend for you seeing as i have not cut them yet. Pm me i can be forgetful.
AS far as that dual rate for the rears i notice one side was thinner should i cut there or the thicker? My initial thought is the the thinner end.

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Post by DSPXR4ti » Thu Dec 06, 2007 11:10 pm

Hey, what are you planning on doing?

You should cut the thinner ones and I would cut by 360 deg. the first time reinstalling them and go from there you know how that go's you cut to much you are done.

Ben
85 DSP XR4ti, 2009 Solo 2 National Champion, burns muffler, 3in exhaust, Mc2 Full suspension, 325 hps & 328tqr, GMR Intake, Wilwood brakes, Eaton LSD, stand alone ECU. Working on being SM National Champion.

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Post by milehighXR » Thu Dec 06, 2007 11:30 pm

Grayson wrote:Keep in mind the rear springs are not linear (nor are they progressive). They're dual rate.
Huh? I have an MVMA report that says otherwise. It claims they're in fact progressive. Granted the report may not be totally accurate, as it was probably published with specs of what Ford "intended" to build. I 've been meaning to scan it for posterity, I suppose now's the time... Explain the dif bewtween dual rate and progressive for the boobs like me please.
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Post by janvanv » Fri Dec 07, 2007 2:11 pm

milehighXR wrote:
Grayson wrote:Keep in mind the rear springs are not linear (nor are they progressive). They're dual rate.
Huh? I have an MVMA report that says otherwise. It claims they're in fact progressive. Granted the report may not be totally accurate, as it was probably published with specs of what Ford "intended" to build. I 've been meaning to scan it for posterity, I suppose now's the time... Explain the dif bewtween dual rate and progressive for the boobs like me please.
A taper ground wire, like the Xrratty and XR4i uses alone of all Sierra models
will indeed be a variable rate as it compresses, how could it be otherwise?
And that rate from the skinny portion to the fatter does indeed climb or "progress" upwards as the spring is compressed.

And that variability, which makes choosing appropriate damping values difficult, is why they are so seldom seen as car or for that matter motorcycle suspension springs.
The usual dual rate on stuff I've used is: two separate springs of two different rates.
John Vanlandingham
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Post by whitelx » Sat Dec 08, 2007 1:59 am

My rough calculations put the front spring length around 16.5"

Can anyone verify the length for me?
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
http://www.youtube.com/user/whitelx

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Post by DPDISXR4Ti » Sat Dec 08, 2007 10:48 am

Ya know, we might be more eager to help if we knew what you were up to. :dunno
Brad

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Post by Ray » Sat Dec 08, 2007 4:04 pm

my oem front springs are 15" (just went outside to the storage shed and checked).

Granted, they're original.
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Post by DSPXR4ti » Sat Dec 08, 2007 7:30 pm

demonfire wrote:my oem front springs are 15" (just went outside to the storage shed and checked).

Granted, they're original.
You see now you have two different measurements, I think I know what your try to do and the best thing to do is cut your springs your trying to cut very little at a time, put the springs back in your car cut a little more and so on & so on, just take your time, you will be a lot happier for it.

Ben
85 DSP XR4ti, 2009 Solo 2 National Champion, burns muffler, 3in exhaust, Mc2 Full suspension, 325 hps & 328tqr, GMR Intake, Wilwood brakes, Eaton LSD, stand alone ECU. Working on being SM National Champion.

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Post by whitelx » Sat Dec 08, 2007 7:58 pm

brncapri wrote:
demonfire wrote:my oem front springs are 15" (just went outside to the storage shed and checked).

Granted, they're original.
You see now you have two different measurements, I think I know what your try to do and the best thing to do is cut your springs your trying to cut very little at a time, put the springs back in your car cut a little more and so on & so on, just take your time, you will be a lot happier for it.

Ben
I'm not trying to cut the stock springs. Although I will be cutting a set of springs eventually. I ordered a set of 5"x11" 325 lb springs. They were $10 each so I don't feel too bad if I end up not being able to use them.
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
http://www.youtube.com/user/whitelx

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