[DeTomaso] Spring rates
cengles at cox.net
cengles at cox.net
Thu Jan 24 10:41:55 EST 2013
Dear Dick,
Well, I can start that discussion with the anecdotal case
report.
Pantera 1 has the beefier steel "spreader" bar and an
auxiliary smaller brace below and behind it over the ZF. It also has
the "lesser" springs + Konis. The springs are, IIRC, about 375/ 500
(I think).
Pantera 2 has the stock "spreader" bar and no auxiliary
bracing. It has the "heavier" springs + Konis. Springs are, IIRC,
425/ 600.
Please note that both Panteras are late '74s. VINs are
very close: 7171 and 7191. In my opinion neither have any rust issues
nor evidence of previous collisions. Pantera 1 was repainted once about
10 years ago. Pantera 2 was originally orange, then silver and in 1988,
finally, yellow. Both Panteras are shod with the same size 17 inch
wheels and tires.
Oh, and Pantera 1 has the 485 hp engine, while Pantera 2 has the 385 HP
engine.
Guess which car has more paint cracking? Pantera 2 with
less bracing and more spring rate and less torque---and more repaints.
I am suspicious that the difference is the bracing. Finally, I can't
tell any difference in their ride and handling, both are perfectly fine
by my seat-of-the-pants-o-meter.
Warmest regards, Chuck Engles
On Thu, Jan 24, 2013 at 8:51 AM, Dick Koch wrote:
Charles and others, it would be interesting to find out from
folks that went to higher spring rates and the effect that had, if
any, on the body shell, i. e. cracking at the known weak points of
the body shell.
When I ever get around to it, I plan to install new "heavier"
springs that I bought a while back. I would like to get input
from anyone that has gone to stiffer springs, and has not
installed additional chassis stiffeners.
Dick Koch - Atlanta
On 1/23/2013 8:31 PM, Charles Engles wrote:
Dear Bill,
You wrote:
"I am quite amazed at the spring rates being used on cars which are
reported to be very nice riding on the street.
BTW, my car, with 200/350 springs rides like a heavy duty truck."
You've hit upon a Pantera phenomenon, I think. When I changed
my
first Pantera from stock to heavier springs, I thought I would be
cautious
and scale it back a bit from the recommendations of PPC. After the
Konis
and springs, it felt like a new car. The ride was fine, but pleasantly
firmer than stock.
Then several years later, I changed the suspension on my second
Pantera. I was confident enough to go a bit higher than the
recommendations
of PPC. After the new Konis and springs, the second Pantera rode and
handled as well as the first one. I much prefer the suspension upgrade
to
the stock suspension.
It is interesting that a large number of Pantera owners find no
detriment to the ride comfort with multiples of stock spring rates. I
don't
think that we're all deluding ourselves. I would say the phenomenon is
there. I *think* that it is there due some excellent design
characteristics
of the suspension which obviously tolerates a wide range of higher
spring
rates without a wide range of unhappy owners and drivers. FWIW.
Warmest regards, Chuck Engles
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