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Rear sway bar suggestion
#1
I'm looking to upgrade my front and rear sway bar. The front suspension will have stock style control arms with 1" lowering springs. The car is a 73 mach Q so what sway bar do I need for the rear? I was looking at the addco 3/4 but it says it's not a factory replacement bar. Suggestions on a sway bar kit that comes with everything I need that will work with 295's tires. Thanks
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#2
73' mach 1;287720 Wrote:I'm looking to upgrade my front and rear sway bar. The front suspension will have stock style control arms with 1" lowering springs. The car is a 73 mach Q so what sway bar do I need for the rear? I was looking at the addco 3/4 but it says it's not a factory replacement bar. Suggestions on a sway bar kit that comes with everything I need that will work with 295's tires. Thanks

What spring rate and shocks are you running?
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#3
Bentworker;287723 Wrote:
73' mach 1;287720 Wrote:I'm looking to upgrade my front and rear sway bar. The front suspension will have stock style control arms with 1" lowering springs. The car is a 73 mach Q so what sway bar do I need for the rear? I was looking at the addco 3/4 but it says it's not a factory replacement bar. Suggestions on a sway bar kit that comes with everything I need that will work with 295's tires. Thanks

What spring rate and shocks are you running?

I'm using factory spring rate from Eaton, Bilstein sport shocks and TPC 4.5 mid eye 1" lowering.
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#4
From "How to make your car handle"

The quoted section of the book was actually in caps...

"Here is the secret of chassis tuning: THE SUSPENSION WITH THE HIGHEST ROLL STIFFNESS WILL RECEIVE THE LARGEST PORTION OF WEIGHT TRANSFER CAUSED BY BODY ROLL."

Your front springs are most likely a little soft since they are stock spring rate in comparison to your rear leafs. My wild guess would be to run a large front bar and a small rear one. Maybe an 1 1/8" front and as small as you can find on the rear. This is just a guess...

Sway bars are inexpensive, it may be worth buying a few and swapping them out to see how it handles. If you go too big in the rear you will lift your inner rear tire during hard cornering in extreme cases, or at least loose enough grip that you will have tire spin.
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#5
Bentworker;287756 Wrote:From "How to make your car handle"

The quoted section of the book was actually in caps...

"Here is the secret of chassis tuning: THE SUSPENSION WITH THE HIGHEST ROLL STIFFNESS WILL RECEIVE THE LARGEST PORTION OF WEIGHT TRANSFER CAUSED BY BODY ROLL."

Your front springs are most likely a little soft since they are stock spring rate in comparison to your rear leafs. My wild guess would be to run a large front bar and a small rear one. Maybe an 1 1/8" front and as small as you can find on the rear. This is just a guess...

Sway bars are inexpensive, it may be worth buying a few and swapping them out to see how it handles. If you go too big in the rear you will lift your inner rear tire during hard cornering in extreme cases, or at least loose enough grip that you will have tire spin.

How much difference would there be between Eatons factory spring rate vs their competition rate? With my sport shocks do I have to go with the stiffer spring or is it more of a suggestion? I think my factory spring rate with AC is 138ish.
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#6
Addco 550 front and 990 rear. 990 is a factory style bar but, you will need to source the rear bar frame mounts, bushings, and fasteners.

Chuck
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#7
c9zx;287838 Wrote:Addco 550 front and 990 rear. 990 is a factory style bar but, you will need to source the rear bar frame mounts, bushings, and fasteners.

Chuck

Exactly what I was looking for! Thanks
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#8
IMHO the 990 is a 7/8" bar and is too large for the rear if you have stock rate front springs. If you try it and find yourself not getting traction with your inside rear tire during auto cross events you might want to go down to the 3/4" 996... or smaller.

The 550 front is an 1 1/8" bar.

As for front spring rate, you would have to get ahold of Eaton to see exactly what your springs are. Since you allready have Bilstein sport shocks you probably don't use your ride to transport wedding cakes. You could try the 7/8" rear bar, take it to an auto cross and try it out. If you find yourself wanting more traction on your inside rear tire you could reduce the size of the rear swaybar, increase the size of the front or put higher spring rate springs in the front.
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#9
Bentworker;287849 Wrote:IMHO the 990 is a 7/8" bar and is too large for the rear if you have stock rate front springs. If you try it and find yourself not getting traction with your inside rear tire during auto cross events you might want to go down to the 3/4" 996... or smaller.

The 550 front is an 1 1/8" bar.

As for front spring rate, you would have to get ahold of Eaton to see exactly what your springs are. Since you allready have Bilstein sport shocks you probably don't use your ride to transport wedding cakes. You could try the 7/8" rear bar, take it to an auto cross and try it out. If you find yourself wanting more traction on your inside rear tire you could reduce the size of the rear swaybar, increase the size of the front or put higher spring rate springs in the front.

I'm interested in a more firm ride but it won't be used for autocross. I'll give eaton a call. I fear that I'll need to sell the ones eaton made for me before even installing them....They are 1" lowering with the factor spring rate.
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#10
There are few choices for an OEM style/shaped/placed rear anti-roll bars. The ones I'm aware of are the factory .5 and .625 inch bars and the Addco bar. The are many more choices for non-OEM style bars that would likely work with the 295 rear tires but, may not accommodate tail pipes. If the intended use is auto cross or open track, then I would suggest adjustable bars both front and rear. This would permit tuning with changes in tires, springs, shocks, and other suspension components and geometry. Chuck
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