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10/08/2016 2:23 PM  #1


Too much body roll

On my '65 GT fastback, I have the following:
Suspension
7/8" sway bar original
Rubber sway bushing
Arning Drop
Daze Alignment
620 front springs
Roller spring perches
End links with polyurethane bushing
Rear shock bilstein 55-R056
Front shock 55-R054 street
Four leaf stock springs rear
Traction Master traction bars
Pirelli four seasons 215/60R15 to 32lbs cold on steel style wheels


I have too much body roll in the corners and am looking to correct this issue. Car is spiritedly driven i.e. Hard.
I think first step is new bushings in sway bar and end links. Then stiffer bilsteins? Suggestions please? Not trying to reinvent the car just fix the body roll. Steering is tight and box close ratio andrebuilt by Mustang Barn.
Thanks

 

10/08/2016 2:31 PM  #2


Re: Too much body roll

I put a 1" front sway bar on my 66 and it made a huge improvement.

DC


www.quadmat.com  Butyl Sound Deadener & Insulation
 

10/08/2016 3:42 PM  #3


Re: Too much body roll

After 1" sway bar do Monte Carlo bar and export brace.  Do both at the same time as they both go under the hood.  The export brace is not as important as the main stiffening comes from the Monte Carlo Bar.  Then sub frame connectors.  Get the weld in kind. 

A rear sway bar (1/2"-3/4") is not absolutely necessary, but I really like the way mine works. It really flattens the curves.  Again, weld in mounts.

For spirited driving you must have disk brakes.  With 15" wheels you can only have disk of 11.5" max.  You need 16" wheels to go to 12" disks.  Any of the ones on the market will do the job.  MS and most of the rest would make them power assisted.  Look at the FAQ page for ways to do it.  Do rears only if that spirited driving you talk about involves jamming on the brakes often to get around corners as with a race car.

IMHO that is all you need for anything short of racing.

Last edited by lowercasesteve (10/08/2016 3:52 PM)


Original owner - 351w,T-5, 4whl disks, power R&P
 

10/08/2016 4:22 PM  #4


Re: Too much body roll

x 2 on the 1" sway bar. That mod made the most difference on my 66. Night and day on the body roll. 


Good, fast or cheap. Pick any two...
 

10/08/2016 4:37 PM  #5


Re: Too much body roll

William, do you still have that 1-3/8" front sway bar you got from me?  While that is a bit larger than really needed, if you already own it...


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

10/08/2016 4:47 PM  #6


Re: Too much body roll

All,
Thanks for the suggestions. I forgot to mention the car has a straight Monte Carlo bar, factory export brace and factory manual disc brakes. Two questions, since Ithe car has a factory 7/8" sway bar, will a 1" sway bar really help? I would understand going from the wimpy non-GT 1/2" one to a greater size. Also, since there are traction masters in the back does that negate the need for a sway bar?

     Thread Starter
 

10/08/2016 7:06 PM  #7


Re: Too much body roll

Does it already have subframe connectors?

Otherwise you're really fighting chassis twist, not body roll.  You can spring, shock, and swaybar the thing to death trying to twist it into the pavement, but its a losing battle and will never be predictable. 

 

10/08/2016 8:38 PM  #8


Re: Too much body roll

MWM wrote:

All,
Thanks for the suggestions. I forgot to mention the car has a straight Monte Carlo bar, factory export brace and factory manual disc brakes. Two questions, since Ithe car has a factory 7/8" sway bar, will a 1" sway bar really help? I would understand going from the wimpy non-GT 1/2" one to a greater size. Also, since there are traction masters in the back does that negate the need for a sway bar?

 
The Traction Masters are to combat spring wrap and wheel hop, not for flatter cornering.  Sway bars are transverse springs, the inside wheel tries to push down the outside wheel that the force of cornering is trying to force up. A 7/8" bar is 0.601sq. In. A 1" bar is 0.785 sq.in., an increase of 30%, so yes a 1" bar will have a noticable effect. On a rear wheel drive car Increasing the size of the front swaybar will increase understeer. A rear swaybar increases oversteer, so if understeer becomes objectionable, install a rear swaybar, start at 5/8".

 

10/09/2016 10:17 AM  #9


Re: Too much body roll

Remember, springs and swaybars control your roll stiffness and shocks control the unsprung weight and transitions. I started with a 1 3/8 swaybar on the front and ended up going up to a competition one with splined ends and custom arms to fit my 65 FB. When I had the Shelby drop with stock suspension I set it up to have a little roll so I could take advantage of the good camber curve with the Shelby drop. I now have a MII style front only to get rid of the shock towers to make room for a real set of headers. It is not how flat you go around a corner is is how FAST you go around the track. Most modern tires need an increase in camber with an increase in side load to work well. On a car that you street drive, that Shelby drop camber curve is great so you can still get some tread life in normal driving.

 

10/09/2016 6:40 PM  #10


Re: Too much body roll

Tires might be a big factor.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

10/11/2016 11:48 AM  #11


Re: Too much body roll

Thanks All!
I will install the larger MS sway bar. Later I will ask santa for a larger set of wheels to cut down potential sway. Hard to find quality stuff in a 15".

     Thread Starter
 

Board footera


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