eibach springs

FiveOGirl · 10-11-2001, 10:51 AM

I have a 2001 Convertible mustang... Im not sure if i want the prokit springs or the sportline springs..... id like my car to have an aggressive stance.. i was told the pro kit will not lower a 2001 mustang all the much.. is that true? will the sportline springs make my car bouncy? and will i HAVE to have camber/caster plates with the sportline springs? can someone help me dicide.. the car is a daily driver and i wont be racing it but i do drive pretty aggressive around corners and such.

drudis · 10-11-2001, 02:50 PM

FYI, here is a list I have been compiling. You'll have to make the choice (find someone with the springs you want to get...)

I got this data:
SPRING..............FRONT.............REAR
Stock GT............400-500...........165-265
Stock Cobra.........400...............160
CCM Race............750-850...........200-300
CCM HD Race.........950-1050..........200-300
Eibach ProKit coupe.460-570...........200-250
Eibach ProKit vert..460-570 (1.5")....170-310
Eibach Sport (2")...660...............260
FMC "B".............425-530...........200-300
FMC "C".............650...............200-300
FRPP "R"............700-880...........200-260
Global West.........800...............160
Global West drag....680...............???
Global West comp....1000..............???
Griggs coil-overs.(recommend..........400#front)
Griggs NON-coilover rear..............350#
Griggs rear coil-overs................225 TA
H&R race............750...............265
H&R super race......1020..............300
Jamex (1.5")........450-550...........170-220
MAC....600,680,700,800,925....160,170,190,215
Susp Tech street....725...............230
Susp Tech comp......850...............280
Steeda sport(1")....650...............200-250
Steeda comp/street..700-850 (1.25")...250
Steeda full comp....850-1050 (1.35")..250
Susp Tech street....725...............230
Susp Tech comp......850...............280

Discalimer: Not exactly sure where I compiled it
from, nor its accuracy, but it appears to be ligit.

------------------
Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)

My Mustang Page

Skankin · 10-11-2001, 03:11 PM

It's the crappy stock struts & shocks that make things bouncy. The resistance in a cheap shock is greatly increased with piston speed, so you really feel the sharp bumps. Better shocks are digressive valved, so the sharp bumps aren't as bad.

Bilstein's provide a great ride & handle decent spring rates.

The pro-kit front springs are too light. I'd look for something around 600lbs or so.

The location of the spring on the control arm determines the wheel rate.

You wanna keep the front & rear weight per wheel rate about equal, or bumps will cause front/rear pitching, and you'll get sea sick (if the struts/shocks are under-damped).

Front wheel rate ~ spring_rate / 4
Rear wheel rate ~ spring_rate / 2

The stock springs are around 400# & 200#, corresponding to wheel rates around 100#. BUT, it's not a 50:50 weight distribution... closer to 60:40. So if you run a 100# rear wheel rate, you should go for a 150# front wheel rate... ie 600# & 200# springs. (You might want a little more rear rate with the verts heavy rear).

Also, as you lower the front, the control arms become more angled and the roll centre gets REALLY low (possibly below ground). This means you'll actually increase the front roll (if you don't use stiffer springs).

H&R makes great springs, and they have stuff specifically matched for your combo.

FiveOGirl · 10-14-2001, 12:40 PM

will i regret the eibach sportline springs if the car is a daily driver?

Skankin · 10-25-2001, 01:14 PM

Definitely not. I got the FMS B springs (similiar to the wimpy pro-kits), and I definitely want more rate.

Just make sure you do the shocks & struts at the same time.
www.oemfordparts.com and www.buyfordmotorsport had the 2000 cobra R bilstein struts for half the price of anyone else! $275 I think. They'll handle the heavy spring rate, and supposedly offer an excellent ride.
www.shox.com has the bilstein rear B46-2148 shocks for $70 each. SO that's $415 for awesome shocks & struts... then you just need some springs. You can get teh sportlines for 189, total = $604 + shipping.

The FMS____R58 springs were used on the 95 cobra R, and they're actually the Eibach R springs (700-850# fronts, 200-260# rears?). They're a pretty good price too.

If you went a little lighter (FMS-C, Eibach sportline, H&R supersport), you could use the tokico illumina's, which are a little cheaper (they won't hold up the same though).
www.shox.com also had a Tokico Illumina Suspension Kit $579.00. The sportline 660/260 should work alright with the vert. I'd pay a little more for the bil's though.

Koni makes a great shock, but they'll be a little rougher on the road (unless you pay for the DA's).

11-02-2001, 02:54 PM

Not having had much experience with the newer fox4 Mustangs, I cannot answer with any degree of accuracy, but I can tell you what worked on my '91 GT.

High rate springs up front can tend to make the fron jittery which will kill your high speed corner exit. The mustang is prone to understeer under power anyway, so if anything, you need help planting the front outside tire. Bigger front sway bars might help, but they tend to introduce their own set of problems, plus they don't help much with the rough road surfaces and they add weight in front of the front tires. Definately a bad thing in the already front heavy Mustang. Camber plates will definately help. They allow you to maximize Camber/Caster which is one thing the Mustang definately needs. With the present stock Mustang setup, there is no camber gain during compression which hurts the general cornering capabilities of the Mustang. What I finally came up with was Maximum MotorSports Camber Caster Plates, Koni coilover conversion (Front and Rear) and polyurathane suspension bits (front, rear and tranny). I found that the lowering springs really screwed up the front geometry and greatly increased the bumpsteer. Even with offset rack bushings, bumpstear was noticable. Switching to '95 or up spindles will help, so this may not be a problem for you. When I finally sorted out the rear suspension problems, then I was able to drastically increase my spring rates without creating that "lumber wagon" effect.

10-11-2001, 10:51 AM	#1
FiveOGirl Registered Member Join Date: Aug 2001 Location: san francisco, Ca USA Posts: 52	eibach springs I have a 2001 Convertible mustang... Im not sure if i want the prokit springs or the sportline springs..... id like my car to have an aggressive stance.. i was told the pro kit will not lower a 2001 mustang all the much.. is that true? will the sportline springs make my car bouncy? and will i HAVE to have camber/caster plates with the sportline springs? can someone help me dicide.. the car is a daily driver and i wont be racing it but i do drive pretty aggressive around corners and such.

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10-11-2001, 02:50 PM	#2
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	FYI, here is a list I have been compiling. You'll have to make the choice (find someone with the springs you want to get...) I got this data: SPRING..............FRONT.............REAR Stock GT............400-500...........165-265 Stock Cobra.........400...............160 CCM Race............750-850...........200-300 CCM HD Race.........950-1050..........200-300 Eibach ProKit coupe.460-570...........200-250 Eibach ProKit vert..460-570 (1.5")....170-310 Eibach Sport (2")...660...............260 FMC "B".............425-530...........200-300 FMC "C".............650...............200-300 FRPP "R"............700-880...........200-260 Global West.........800...............160 Global West drag....680...............??? Global West comp....1000..............??? Griggs coil-overs.(recommend..........400#front) Griggs NON-coilover rear..............350# Griggs rear coil-overs................225 TA H&R race............750...............265 H&R super race......1020..............300 Jamex (1.5")........450-550...........170-220 MAC....600,680,700,800,925....160,170,190,215 Susp Tech street....725...............230 Susp Tech comp......850...............280 Steeda sport(1")....650...............200-250 Steeda comp/street..700-850 (1.25")...250 Steeda full comp....850-1050 (1.35")..250 Susp Tech street....725...............230 Susp Tech comp......850...............280 Discalimer: Not exactly sure where I compiled it from, nor its accuracy, but it appears to be ligit. ------------------ Darius Rudis Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-) My Mustang Page

10-11-2001, 03:11 PM	#3
Skankin Registered Member Join Date: Dec 1998 Location: London, Ontario, Canada Posts: 1,349	It's the crappy stock struts & shocks that make things bouncy. The resistance in a cheap shock is greatly increased with piston speed, so you really feel the sharp bumps. Better shocks are digressive valved, so the sharp bumps aren't as bad. Bilstein's provide a great ride & handle decent spring rates. The pro-kit front springs are too light. I'd look for something around 600lbs or so. The location of the spring on the control arm determines the wheel rate. You wanna keep the front & rear weight per wheel rate about equal, or bumps will cause front/rear pitching, and you'll get sea sick (if the struts/shocks are under-damped). Front wheel rate ~ spring_rate / 4 Rear wheel rate ~ spring_rate / 2 The stock springs are around 400# & 200#, corresponding to wheel rates around 100#. BUT, it's not a 50:50 weight distribution... closer to 60:40. So if you run a 100# rear wheel rate, you should go for a 150# front wheel rate... ie 600# & 200# springs. (You might want a little more rear rate with the verts heavy rear). Also, as you lower the front, the control arms become more angled and the roll centre gets REALLY low (possibly below ground). This means you'll actually increase the front roll (if you don't use stiffer springs). H&R makes great springs, and they have stuff specifically matched for your combo.

10-14-2001, 12:40 PM	#4
FiveOGirl Registered Member Join Date: Aug 2001 Location: san francisco, Ca USA Posts: 52	will i regret the eibach sportline springs if the car is a daily driver?

10-25-2001, 01:14 PM	#5
Skankin Registered Member Join Date: Dec 1998 Location: London, Ontario, Canada Posts: 1,349	Definitely not. I got the FMS B springs (similiar to the wimpy pro-kits), and I definitely want more rate. Just make sure you do the shocks & struts at the same time. www.oemfordparts.com and www.buyfordmotorsport had the 2000 cobra R bilstein struts for half the price of anyone else! $275 I think. They'll handle the heavy spring rate, and supposedly offer an excellent ride. www.shox.com has the bilstein rear B46-2148 shocks for $70 each. SO that's $415 for awesome shocks & struts... then you just need some springs. You can get teh sportlines for 189, total = $604 + shipping. The FMS____R58 springs were used on the 95 cobra R, and they're actually the Eibach R springs (700-850# fronts, 200-260# rears?). They're a pretty good price too. If you went a little lighter (FMS-C, Eibach sportline, H&R supersport), you could use the tokico illumina's, which are a little cheaper (they won't hold up the same though). www.shox.com also had a Tokico Illumina Suspension Kit $579.00. The sportline 660/260 should work alright with the vert. I'd pay a little more for the bil's though. Koni makes a great shock, but they'll be a little rougher on the road (unless you pay for the DA's).

11-02-2001, 02:54 PM	#6
mleboeuf Guest Posts: n/a	Not having had much experience with the newer fox4 Mustangs, I cannot answer with any degree of accuracy, but I can tell you what worked on my '91 GT. High rate springs up front can tend to make the fron jittery which will kill your high speed corner exit. The mustang is prone to understeer under power anyway, so if anything, you need help planting the front outside tire. Bigger front sway bars might help, but they tend to introduce their own set of problems, plus they don't help much with the rough road surfaces and they add weight in front of the front tires. Definately a bad thing in the already front heavy Mustang. Camber plates will definately help. They allow you to maximize Camber/Caster which is one thing the Mustang definately needs. With the present stock Mustang setup, there is no camber gain during compression which hurts the general cornering capabilities of the Mustang. What I finally came up with was Maximum MotorSports Camber Caster Plates, Koni coilover conversion (Front and Rear) and polyurathane suspension bits (front, rear and tranny). I found that the lowering springs really screwed up the front geometry and greatly increased the bumpsteer. Even with offset rack bushings, bumpstear was noticable. Switching to '95 or up spindles will help, so this may not be a problem for you. When I finally sorted out the rear suspension problems, then I was able to drastically increase my spring rates without creating that "lumber wagon" effect.