Suspension options breakdown

[radtexas]

The more I research the more I get confused and unsure of what I want to do. I do want to lower the car but not as much as the Eibach springs alone do. I want to increase handling and performance but this is not a track car (straight or twisty).

 

I am considering coil-overs because they will let me dial in any height I want. And can change heights at any time. However they do cost more than just springs & camber plates. I do like on some being able to adjust ride feel but not sure how important that may be compared to the matched up component packages.

 

I tried to compile a list of different brands and lowest found prices that meet the requirements I was wanting. Some have all the components which is nice while others will need items such as the camber plates.

 

Question on coil-overs; if you change the height would this require re-alignment? Of do you just get the alignment after install because you take apart ?

 

Springs I want to keep to about 1.25 max. drop in front.

Coil-overs I want keep to be able to at least adjust back to stock ht. to 1.0" drop minimum.

 

[dbackg]

A spring rate is how much force needs to be applied to compress the spring through a given distance. If you have a 134 lb per inch spring, then it will take 134 pounds to compress the spring 1 inch. It let's you know how firm or soft the ride will be.

2005-09 FORD RACING MUSTANG LOWERING SPRINGS

GT = FRPP PART # M-5300-K, lowers approx 1.5"

 

Spring Rate

Front 173-248lb/in (variable)

Rear 195-236lb/in (variable)

 

Ford factory spring rates are for the GT Mustang 2005-09: Hardtop - 165lb front / 142lb rear. Convertible - 144lb front / 122lb rear.

Good info from the another forum:

http://mustangforums...ng-allowed.html

 

S197 type springs

 

Apparently these were all tested using a very good digitalload cell based spring tester made in Germany for H&R springs.

 

Name- (part number)- lowering amount- spring rates

 

Stock/Factory GT springs (Tags= Yellow, Orange) - front: 136lb/in rear: 142lb/in

(Tags= Yellow, Orange) - front: 136lb/in / rear: 142lb/in, I have confirmed all of these rates

using a 0.000000Nm German spring tester, very soft with lots of roll and moderate understeer

 

Eibach Pro-kit (pn 35101.140) / Ford Racing (K-springs) (pn M-5300-K) 1.5/1.7 -

Front 173-248lb/in (variable) - Rear 195-236lb/in (variable)

Progressive rate front springs with a starting rate of 173lb/in a working rate of 239lb/in and max. rate 247.6lb/in at coil bind, good spring rates but ride height is a bit too low, will easily bottom out all the time with harsh ride due to the rear axle living on the bumpstops all the time due to excessive lowered ride heighting with potential to snap over steer on rough roads with suspension loaded up.

 

Eibach Sportline (pn 4.10135) 1.6/2.0 -

1.6/2.0 - tested, lost data but these spring rates are extremely high and are IMO unsafe due to almost zero rear travel before going solid and into snap oversteer, these are poser springs

 

Steeda Ultra-lite (pn 555-8206) 1.25/1.5 front: 195lb/in rear: 175lb/in

Steeda Ultra-lite (pn 555-8206) 1.25/1.5 front: 195lb/in / rear: 175lb/in,

Testing verified, front measure 198lb/in, rear measure 167lb/in and both are linear rate springs.

 

Steeda Sport (pn 555-8216) 1.0/1.25 - front: 200lb/in rear: 175lb/in

1.0/1.25 - front: 200lb/in / rear: 175lb/in, Testing verified,

front measure 205lb/in, rear measure 168lb/in and both are linear rate springs.

 

Steeda Competition (pn 555-8241) 1.0/1.25 - front: 225lb/in rear: 185lb/in

(pn 555-8241) 1.0/1.25 - front: 225lb/in / rear: 185lb/in, Testing verified

front measure 231lb/in, rear measure 172 and both are linear rate springs.

 

H&R Sport (pn 51655) 1.0/.75 -

 

H&R Super Sport (pn 51655-77) 1.7/1.9 -

 

H&R Race (pn 51655-88) 1.5/1.4 -

 

Roush Performance {sold in pairs} (pn 401294 and 401295) 1.0/1.0 -

 

Roush Extreme (pn 402331) 1.0/1.25 -

 

Tein H-tech (pn SKG12-BUB00) 0.94/1.65 - front: 163lb/in rear: 163lb/in

 

Tein S-tech (pn SKG12-AUB00) 1.5/2.24 - front: 174lb/in rear: 174lb/in

 

Vogtland (pn 950084) 1.3/1.3 - variable front: 160-240lb/in variable rear: 120-220lb/in

 

Saleen/Racecraft (pn 10-1302-B12999) 1.25/1.25 -

 

Sprint (pn 2115) 1.6/1.5 -

 

BMR Fabrication Inc. (pn SP009) 1.25/1.5 -

Front: 120-165lb Progressive

Rear: 130lb

 

Part of the M-2007-FR3SVT handling pack

 

GT500/SVT = FRPP PART # M-5300-L, lowers approx 1.25"

http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=9882

 

Does anybody know what the spring rates are?