Cutting factory springs - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 17 Old 08-05-2017, 05:41 PM Thread Starter
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Cutting factory springs

I give my permission to flame! I want to know the good and bad about cutting coils for track use to get proper ride height. I know factory is a different spring style/rate than offered aftermarket. I am currently looking to drop an inch out of a 04 GT, and wouldn't ask about cutting if I didn't see it done more often than those buying an aftermarket spring. I like the 60's I'm getting with the factory springs, and don't want to go to a "lowering" spring, just want to lose some height. Thanks everyone!

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post #2 of 17 Old 08-05-2017, 08:18 PM
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You will lose height definitely. Along with ride quality, ground clearance, steering geometry.

Not worth the effort or work. Get a set of steeda sport springs, some camber bolts and call it a day. A set of koni orange struts shocks wouldn't hurt

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post #3 of 17 Old 08-05-2017, 08:43 PM Thread Starter
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These are rear springs, forgot to mention. Fronts are qa1 coilovers.
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post #4 of 17 Old 08-07-2017, 05:21 AM Thread Starter
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By shortening a factory spring, how would that change ride quality? Granted, I'm not putting the frame on the ground, just losing a coil. For the price of new springs, why not give it a shot?
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post #5 of 17 Old 08-07-2017, 08:33 AM
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I think the rear spring perches are smaller in diameter and if you cut the spring it would not sit in the perch correctly. I may be wrong. Either way, cutting the spring changes the spring rate. Makes it act like a stiffer spring. Do you need a stiffer rear spring? Most drag set-ups go with a softer spring in the rear and use an adjustable shock to control the rear on launch.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #6 of 17 Old 08-07-2017, 10:50 AM Thread Starter
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I won't swear to it, but I've read the factory springs are pretty soft, that's why many people seem to run them. I also don't believe they are a progressive rate spring which takes more force to compress the further it goes. Like I said, I'm open to suggestions, just wondering why there are so many that run them rather than a buy and install a set of dedicated springs.
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post #7 of 17 Old 08-07-2017, 04:06 PM
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The hot ticket is to put springs from a 4 cyl Fox Body car in the rear. And you cut any spring and the rate goes up. Cut just one coil off and then try to compress just the one coil and see what happens. As you lose coils, rate goes up, it does not matter if it is progressive rate or not. There is a reason a spring is rated at X lbs/in at 14" or 16" or whatever length.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #8 of 17 Old 08-07-2017, 06:04 PM Thread Starter
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Gotcha, thanks for clearing that up, I'm assuming the 4 banger fox being the lightest, would have the softest spring rate at full length?
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post #9 of 17 Old 08-08-2017, 09:19 AM
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Folks been running v8 rear springs with a coil cut off for decades. Just do it and post back. What does the car 60ft now?

80 coupe, N/A 347, tko500 1.34, 6.30 @ 109.01, 9.87 @ 137.06

16 GT, daily driver on pump 93, Procharger 1.42, 6.31 @ 109.59, 9.80 @ 141.57
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post #10 of 17 Old 08-08-2017, 10:39 AM Thread Starter
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Quote:
Originally Posted by 1995gtCPE View Post
Folks been running v8 rear springs with a coil cut off for decades. Just do it and post back. What does the car 60ft now?
1.380 is my best, that's why I'm concerned with cutting springs, I've got a real nice 60' but want to loose a little height.

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post #11 of 17 Old 08-08-2017, 08:29 PM
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Considering the cost is zero, and if you find you ruined the launch you can find another pair of V8 springs almost for zero, then I would try it. Basically nothing to lose monetarily & not even much labor.
FYI - You don’t “torch” springs as you will kill the temper and lose all of your spring rate. So unless your making a lowrider, you cut the springs using a chop saw and keeping the spring as cool as possible.

Never mind...I saw “flame” in your post. As in “flame on” !
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post #12 of 17 Old 08-30-2017, 09:28 AM
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I cut a set of 99 V6 springs exactly one coil. They worked well, lowered the rear about 1", helped my 60' perhaps half a hun, so 1.51's vs 1.56's. That was the good news. The bad news...........I hated them. Always thought they were about ready to pop out. When you cut one full coil, you cut off the flat on the top of the spring. So when you put the spring in with the proper pigtail position on the bottom perch, the top which is no longer flat does NOT want to sit well around the top perch, which is very minimal to begin with.

My solution was to do a lot of research of spring manufacturers. One of the largest, with an amazing website was Moog. There is a section on their website where you can search by spec, and I mean every spec there can be for a spring. Pigtail size, top size, flat top, non flat top, spring rate progressive or linear, total height etc. so after much research and wanting a flat top, pigtail bottom, with a constant rate of a 4 cyl fox spring but 1.5" shorter, I came up with Moog # 7329. It's a OEM spring from like a 83/84 Dodge/Chrysler 4 cyl Eclass pos. Took the part # went to Summit........wham. $64.97 for a pair. Shipped from Moog directly. Filled in the order to get to $100 for free shipping. I absolutely love them. 60' didn't get any better than the cut coil, but they fit perfectly like a stock spring should with the flat top, and I don't have to keep crawling under the car at the track to see if they're sitting OK. Perfect. I'll try and add a link from Summit, but not real good at that. So if you just go to Summit and search the Moog # 7329 it will pop right up.

https://www.summitracing.com/parts/mog-7329

99 coupe. C4/8” 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.
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post #13 of 17 Old 08-30-2017, 10:38 AM Thread Starter
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Originally Posted by bamabox View Post
I cut a set of 99 V6 springs exactly one coil. They worked well, lowered the rear about 1", helped my 60' perhaps half a hun, so 1.51's vs 1.56's. That was the good news. The bad news...........I hated them. Always thought they were about ready to pop out. When you cut one full coil, you cut off the flat on the top of the spring. So when you put the spring in with the proper pigtail position on the bottom perch, the top which is no longer flat does NOT want to sit well around the top perch, which is very minimal to begin with.

My solution was to do a lot of research of spring manufacturers. One of the largest, with an amazing website was Moog. There is a section on their website where you can search by spec, and I mean every spec there can be for a spring. Pigtail size, top size, flat top, non flat top, spring rate progressive or linear, total height etc. so after much research and wanting a flat top, pigtail bottom, with a constant rate of a 4 cyl fox spring but 1.5" shorter, I came up with Moog # 7329. It's a OEM spring from like a 83/84 Dodge/Chrysler 4 cyl Eclass pos. Took the part # went to Summit........wham. $64.97 for a pair. Shipped from Moog directly. Filled in the order to get to $100 for free shipping. I absolutely love them. 60' didn't get any better than the cut coil, but they fit perfectly like a stock spring should with the flat top, and I don't have to keep crawling under the car at the track to see if they're sitting OK. Perfect. I'll try and add a link from Summit, but not real good at that. So if you just go to Summit and search the Moog # 7329 it will pop right up.

https://www.summitracing.com/parts/mog-7329
Thanks man! I'll check them out!
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post #14 of 17 Old 09-01-2017, 11:28 AM
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As a follow up for anybody who wants to search for springs like I did, here's the link to Moog universal spring specifications. Very comprehensive. I chose the #7329 and love them.

Universal Coil Spring Specifications | Moog Suspension Parts

99 coupe. C4/8” 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.
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post #15 of 17 Old 09-01-2017, 01:28 PM
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I ended up with an adjustable upper spring perch and a 10" 300lb spring. Works for me.
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post #16 of 17 Old 09-01-2017, 04:53 PM Thread Starter
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Originally Posted by bender4601 View Post
I ended up with an adjustable upper spring perch and a 10" 300lb spring. Works for me.
Sounds interesting. Didn't know it could be adjustable, and is that a generic spring as well?
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post #17 of 17 Old 09-01-2017, 07:07 PM
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yes.. Generic spring. Same diameter as standard front coil overs.

Wolfe Race Craft - Detail
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