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Discussion Starter #1
Are there any fiberglass leaf springs available for mustangs? i know that they are available for camaros. I hear that are better because both springs are up to 75% lighter than one regular spring, they never warp, never rust, and there usually no wheel hop. any one else have any info.
kenny
 

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My personal opinion is YUK. They don't
work for my application but if you're
mostly drag-oriented, they're ok for that.
You'll find what you're looking for at-
http://flex-a-form.com/web/products.asp
They do make stuff specifically for the
Mustang market as well and have been
making that product available since the
early 90's.
 

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Why wouldn't fiberglass springs work for road racing? Seems like they would be more responsive than a steel spring. I heard that the corvette Z06 uses a glass transverse mounted spring.

<font size=-1>[ This Message was edited by: Jimbo on 4/10/02 9:16am ]</font>
 

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Don't get me started about Vettes....
The problem with glass leaf springs is
directly related to side forces. They
don't handle them well in the traditional
Mustang example. To handle that problem,
you then have to resort to axle control
stuff like panhard rods or watts linkages.
The panhard solution usually imposes
geometry on the rear suspension that is
not desired. The watts link, if properly
executed is a much better deal, but now
you're adding weight back into the car.
Tried the fiberglass leaf setup in the
Mustang as a design excercise while I was
at Global West Suspension. It wasn't the
"solution" that we had hoped it would be.
 

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Discussion Starter #5
Ive heard that the Z06 corvett handles veerrry well and it has composite leaf springs on the front and rear suspension.
the skid pad test was somthin like 0.98 g's. Doesnt the skid pad test the side forces???
Kenny
 

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Discussion Starter #6
Wont a rear sway bar help with that as well?
Kenny
 

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Discussion Starter #8
I dont quite understand what <U>transversely mounted</U> leaf springs mean/does?
Kenny
 

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The vette has one leaf spring that runs
in the same direction as the rear axle. The
Vette also has multi-link type control arms to control anything but proper suspension
movement. The leaf does no locating of the
rear at all. Here's a couple pics
http://www.noid.org/~muttvette/pcframe.html

Regards,
BillGear
www.289mustang.com
 

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Thanks for the informative answer 66GT289. Since it sounds like you have done quite a bit of work in the early mustang suspension field, what is your favorite setup for an early Mustang suspension(i.e. springs, shocks, control arms,etc)?
 

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Discussion Starter #11
So a rear sway bar wont help with the side load issues a fiberglass leaf spring brings up? How should the springs fell (meaning negitive effects) in turns?
Kenny
 

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I'm partial to most of the Global West
stuff. They have a new tubular lower arm
out now that did not exist when I was
there. I like the Koni double adjustable
front shocks- have no idea if you can still
get them though. I like the softer spring
choices, usually under 600's in front and
around 150's in back. Most rear shocks are
too stiff, there's only a couple that work
well for handling. The ones from Competition
Engineering are ok and the CureRide units
work well. The DB Performance rack & pinion
steering setup is probably the best of the
rack conversions.
Seems to me the numbers quoted in one of
the earlier post is off a little with
respect to the Z06 Vette. That platform
is considerably better than .98g- the
older ZR-1 vette was about .98 or so.
Maybe that's all the magazine guys could
do with the Z06, but that seems low.
I remember changing some control arm
pick-up points on the ZR-1 and putting
that thing slightly over 1g, way back
in the early 90's.
 

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Rear sway bar is not a locating device for
the rear end, so it won't help in that respect. Think of it as a "selective" spring. The resistance increase is directly proportional to the amount the body "sways"
or leans.
 

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Discussion Starter #14
So how would the car feel with the fiber glass springs and no locating device, meaning would it slide or break?
Kenny
 

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From the engineer's (& driver's) standpoint,
the fear would be de-lamination. That's
usually not a good thing. Once again, from
the driver's standpoint- you're on the edge/
barely in control and suddenly the spring
starts to rip or self destruct. Now you're
oversteering (Nascar "loose&quot
, maybe you
can't correct and now you're stuck in the
car just going along for the ride. Not a
very fun situation- unless you're psychotic.
 

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66GT289, do you have a web address or phone number for DB Performance?

Thanks
Jim
 

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Discussion Starter #17
Flex-a-form says "Fiberglass leaf springs have a number of advantages over steel. They don't rust...they weigh a lot less than old fashioned steel (60% less!) They are stronger than steel with an infinite 'memory' (they won't go FLAT) and return to their original shape quicker than any old steel spring."

Why would they say "They are stronger than steel" if they are not. Bad Business i guess. Seems Fishy huh!
Kenny
 

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Kenny, you'd be surprised the claims some
companies make. Just saw the latest Car
Craft magazine today- the subject of glass
springs comes up in the Marvin Davis tech
section in the back of the magazine. Check
it out.
 

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Why would they say "They are stronger than steel" if they are not. Bad Business i guess. Seems Fishy huh!
Kenny
Well it just may be that per square inch, fiberglass is stronger. I mean the hood companies claim the same thing..that a glass hood is stronger than a steel hood.

Have you ever heard that a strand of spider web is stronger than a strand of steel of the same size? It is possible....
 
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