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Really good stuff here. Copied from here:http://www.stangnet.com/mustang-foru...r-tech.841053/
Over the past week I've been compiling this information and I think it's of value to a lot of people so here it is. I've put the following information into PDF file in a much more organized manor, if you want a visually friendly version of this the PDF can be downloaded below, I tried to attach the file but it's too large so this site won't let me:
Those who are familiar with the 94-04 Mustang may already know that although we have several front and rear swaybar options, but the information that most retailers supply isn’t nearly good enough to make an informed decision when selecting a new swaybar for your vehicle. It is generally thought that a bigger swaybar is stiffer and although that thinking usually does hold true, when you are comparing swaybars with different wall thicknesses this isn’t always the case.
To compare swaybars of the same design you only need to know the relative stiffness which can be calculated using the following equation: R = relative stiffness, OD = outside diameter in inches, and ID = inside diameter in inches.
R = OD to the fourth power - ID to the fourth power
Below I have listed all of the aftermarket swaybars I could find that use the factory the mounting points and design. I have calculated the relative stiffness’s of all the following swaybars and listed them in order from stiffest to softest. You will notice that swaybars with the same relative stiffness have been grouped together to simplify things.
Using this listing you can compare your aftermarket swaybar to another one, so if you have the Eibach bar from group 2 and would like less understeer you can go down to a softer front swaybar from groups 4 or 5, and if you would like less oversteer you could go to a stiffer front swaybar from group 1. By comparing the relative stiffness’s you can see that a group 1 swaybar is 19.6% stiffer then a group 2 swaybar, (1- (3.5745 / 2.9883)) = 19.6%, and a group 3 swaybar is only 0.7% softer, ((1- (2.9675 / 2.9883)) = 0.7%.
Front Swaybar Group 1:
Suspension Techniques 50055
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: Solid
Relative Stiffness: 3.5745
Belltech 5472
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: Solid
Relative Stiffness: 3.5745
Front Swaybar Group 2:
Eibach 3518.310
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.25”, 6.35mm
Relative Stiffness: 2.9883
Hellwig 56704
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.25”, 6.35mm
Relative Stiffness: 2.9883
Front Swaybar Group 3:
Hellwig 6704
Bar Diameter: 1.3125”, 33.3375mm
Wall Thickness: Solid
Relative Stiffness: 2.9675
Summit Racing 720221
Bar Diameter: 1.3125”, 33.3375mm
Wall Thickness: Solid
Relative Stiffness: 2.9675
Front Swaybar Group 4:
Hotchkis Sport Suspension 2251F
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.218”, 5.5372
Relative Stiffness: 2.7970
Front Swaybar Group 5:
Edelbrock 52884
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.188”, 4.7752mm
Relative Stiffness: 2.5785
Steeda 555-1094
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.188” 4.7752mm
Relative Stiffness: 2.5785
Front Swaybar Group 6:
Addco 2110
Bar Diameter: 1.25”, 31.75mm
Wall Thickness: Solid
Relative Stiffness: 2.4414
Front Swaybar Group 7:
Ford Stock 27mm (Unconfirmed, wall thickness calculated based on marketing claims)
Bar Diameter: 1.063”, 27mm
Wall Thickness: 0.180”
Relative Stiffness: 1.0326
Rear Swaybar Group 1:
Hellwig 6801
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Edelbrock 52885
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Summit Racing 720222
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Rear Swaybar Group 2:
Suspension Techniques 51040
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Belltech Sport Trucks 5566
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Eibach 3510.312
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Rear Swaybar Group 3:
Ford Stock 24mm (Unconfirmed, wall thickness calculated based on marketing claims)
Bar Diameter: 0.9449”, 24mm
Wall Thickness: 0.1512”, 3.84mm
Relative Stiffness: 0.6267
Rear Swaybar Group 4:
Steeda 566-19711
Bar Diameter: 0.875”, 22.225mm
Wall Thickness: Solid
Relative Stiffness: 0.5862
Addco 677
Bar Diameter: 0.875”, 22.225mm
Wall Thickness: Solid
Relative Stiffness: 0.5862
Rear Swaybar Group 5:
Ford Stock 21mm
Bar Diameter: 0.8268”, 21mm
Wall Thickness: Solid
Relative Stiffness: 0.4673
Over the past week I've been compiling this information and I think it's of value to a lot of people so here it is. I've put the following information into PDF file in a much more organized manor, if you want a visually friendly version of this the PDF can be downloaded below, I tried to attach the file but it's too large so this site won't let me:
Those who are familiar with the 94-04 Mustang may already know that although we have several front and rear swaybar options, but the information that most retailers supply isn’t nearly good enough to make an informed decision when selecting a new swaybar for your vehicle. It is generally thought that a bigger swaybar is stiffer and although that thinking usually does hold true, when you are comparing swaybars with different wall thicknesses this isn’t always the case.
To compare swaybars of the same design you only need to know the relative stiffness which can be calculated using the following equation: R = relative stiffness, OD = outside diameter in inches, and ID = inside diameter in inches.
R = OD to the fourth power - ID to the fourth power
Below I have listed all of the aftermarket swaybars I could find that use the factory the mounting points and design. I have calculated the relative stiffness’s of all the following swaybars and listed them in order from stiffest to softest. You will notice that swaybars with the same relative stiffness have been grouped together to simplify things.
Using this listing you can compare your aftermarket swaybar to another one, so if you have the Eibach bar from group 2 and would like less understeer you can go down to a softer front swaybar from groups 4 or 5, and if you would like less oversteer you could go to a stiffer front swaybar from group 1. By comparing the relative stiffness’s you can see that a group 1 swaybar is 19.6% stiffer then a group 2 swaybar, (1- (3.5745 / 2.9883)) = 19.6%, and a group 3 swaybar is only 0.7% softer, ((1- (2.9675 / 2.9883)) = 0.7%.
Front Swaybar Group 1:
Suspension Techniques 50055
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: Solid
Relative Stiffness: 3.5745
Belltech 5472
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: Solid
Relative Stiffness: 3.5745
Front Swaybar Group 2:
Eibach 3518.310
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.25”, 6.35mm
Relative Stiffness: 2.9883
Hellwig 56704
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.25”, 6.35mm
Relative Stiffness: 2.9883
Front Swaybar Group 3:
Hellwig 6704
Bar Diameter: 1.3125”, 33.3375mm
Wall Thickness: Solid
Relative Stiffness: 2.9675
Summit Racing 720221
Bar Diameter: 1.3125”, 33.3375mm
Wall Thickness: Solid
Relative Stiffness: 2.9675
Front Swaybar Group 4:
Hotchkis Sport Suspension 2251F
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.218”, 5.5372
Relative Stiffness: 2.7970
Front Swaybar Group 5:
Edelbrock 52884
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.188”, 4.7752mm
Relative Stiffness: 2.5785
Steeda 555-1094
Bar Diameter: 1.375”, 34.925mm
Wall Thickness: 0.188” 4.7752mm
Relative Stiffness: 2.5785
Front Swaybar Group 6:
Addco 2110
Bar Diameter: 1.25”, 31.75mm
Wall Thickness: Solid
Relative Stiffness: 2.4414
Front Swaybar Group 7:
Ford Stock 27mm (Unconfirmed, wall thickness calculated based on marketing claims)
Bar Diameter: 1.063”, 27mm
Wall Thickness: 0.180”
Relative Stiffness: 1.0326
Rear Swaybar Group 1:
Hellwig 6801
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Edelbrock 52885
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Summit Racing 720222
Bar Diameter: 1.00”, 25.4mm
Wall Thickness: Solid
Relative Stiffness: 1.0000
Rear Swaybar Group 2:
Suspension Techniques 51040
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Belltech Sport Trucks 5566
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Eibach 3510.312
Bar Diameter: 0.9375”, 23.8125mm
Wall Thickness: Solid
Relative Stiffness: 0.7725
Rear Swaybar Group 3:
Ford Stock 24mm (Unconfirmed, wall thickness calculated based on marketing claims)
Bar Diameter: 0.9449”, 24mm
Wall Thickness: 0.1512”, 3.84mm
Relative Stiffness: 0.6267
Rear Swaybar Group 4:
Steeda 566-19711
Bar Diameter: 0.875”, 22.225mm
Wall Thickness: Solid
Relative Stiffness: 0.5862
Addco 677
Bar Diameter: 0.875”, 22.225mm
Wall Thickness: Solid
Relative Stiffness: 0.5862
Rear Swaybar Group 5:
Ford Stock 21mm
Bar Diameter: 0.8268”, 21mm
Wall Thickness: Solid
Relative Stiffness: 0.4673