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Re: Chassis stiffening for street car

Posted: Sat Jun 03, 2017 3:27 pm
by John Wallace
There is also a reason the Vettes change to a solid axle when drag racing?

I figured the Mustang change was for street use or road racing type use, for turns?
(for the factory reason)


Re: Chassis stiffening for street car

Posted: Sun Jun 04, 2017 7:02 pm
by Brian P
One would expect a solid rear axle to be better for drag racing for two reasons (1) less stuff to break (no CV joints), and (2) it is possible to have a decent amount of anti-squat in the geometry while still allowing suspension compliance (IRS causes the torque reactions at the diff to go straight into the chassis and these reaction forces therefore cannot be used to influence the suspension). I'm not a drag racer but I've still heard plenty of complaints about wheel hop from those who do, on various IRS-equipped rear drive cars.

If the intent is to go around corners then the balance tips to IRS. But it isn't an absolute necessity. The S197 Mustang handles very well. The 3-link-plus-panhard arrangement allows good toe control, has minimal binding, and avoids having the roll center too high, and it can be set up with anti-squat if you wish. The merits of this suspension design have been discussed before.

The limitation is still what happens on choppy surfaces. A live rear axle is a whole bunch of unsprung weight no matter how you slice it.

Still, on this car, I would consider a live axle to be "period correct", if you wish, and certainly easier to integrate into the design and probably easier to make it work properly.

Re: Chassis stiffening for street car

Posted: Mon Jun 19, 2017 11:27 am
by pdq67
How's this thread coming along?


Re: Chassis stiffening for street car

Posted: Tue Jun 20, 2017 7:51 am
by BobbyB
I am enjoying my my comet more than ever. I had weldcraft widen a couple of wheels to fit 235-50-15 r888 tires to the rear and put 205-60-15 advan ao48 in the front. I have put 500 miles on them in about a month never getting more than 20 miles from home. These tires cost a lot and won't last long but i am having a blast with them.

Tomhorn, any falcon leads?

Re: Chassis stiffening for street car

Posted: Tue Jun 20, 2017 8:16 am
by n2xlr8n
BobbyB wrote: Tomhorn, any falcon leads?
I hope he read what I suggested, anyway.

Re: Chassis stiffening for street car

Posted: Sun Jul 02, 2017 2:38 pm
by tomhorn1913
Still here,

Still reading, thanks. Got side-lined on planning a new house for the missus, so the Falcon project got moved to the back burner. As a result, I've shown up a day late on a couple of promising prospects. I continue to process the thought-provoking input.

Thanks guys!

Re: Chassis stiffening for street car

Posted: Mon Jul 03, 2017 4:29 pm
by BobbyB
The wife & I took the Comet to the Blue Ridge Parkway yesterday evening. It is about 60 miles from our house, the "Feels Like" temp went from about 90+ degrees to about 75 degrees in about an hour and 2500 feet of elevation. The car did great on the curvy roads. I really enjoy the 3 link. Tom, why the "tomhorn1913" handle? Are you a long range shooter? I hope you find your falcon soon.

Re: Chassis stiffening for street car

Posted: Thu Jul 27, 2017 10:47 pm
by tomhorn1913

I'll "shoot" you a PM...


Re: Chassis stiffening for street car

Posted: Sun Aug 20, 2017 12:06 pm
by peejay
PackardV8 wrote:Seeing a '63-65 Falcon or '65-68 Mustang stripped to the tub is scary. There's nothing there but bent tin and not much of that. ... shell.html

Rather similar to the Falcon/Mustang but with strut suspension instead of control arms for even more weight savings.

Firmly remember a long time ago someone posting that Ford engineers have made a science out of using not enough sheetmetal, but putting a fold here and a crease there makes it sturdy enough to work in the real world.