[DeTomaso] Resetting Ride Height With Stiffer Coils

Pantdino pantdino at aol.com
Tue Aug 24 01:40:04 EDT 2010


It will be interesting to see if that is the case.
Goran sent me some information regarding suspension systems once that was over my head, but I do remember that the force felt by the spring is not the same as the weight on the wheel.  Therefore the change in spring compression may not be 0.4"


Jim


-----Original Message-----
From: David & Marilyn Bell <davidabell at worldnet.att.net>
To: Mike Thomas <mbefthomas at comcast.net>; 'Tony DiGiovanna' <tonydigi at optonline.net>; detomaso at realbig.com
Sent: Mon, Aug 23, 2010 10:23 pm
Subject: Re: [DeTomaso] Resetting Ride Height With Stiffer Coils


Mike,
If your car weighs roughly 3200 lb and the weight distribution is roughly
0/60 front to rear, then the weight on the front is 1280 lb so each front
pring must support 640 lb.  A 350 lb/inch spring will deflect 1.8" under
han load while a 450 lb/inch spring will deflect only 1.4".  So you need to
rop your front spring perches by approximately 0.4" to maintain the same
ide height.
Dave Bell

----Original Message-----
rom: detomaso-bounces at realbig.com
mailto:detomaso-bounces at realbig.com]On Behalf Of Mike Thomas
ent: Monday, August 23, 2010 7:44 PM
o: 'Tony DiGiovanna'; detomaso at realbig.com
ubject: Re: [DeTomaso] Resetting Ride Height With Stiffer Coils

hanks.  Should have added that both new and old springs are 10" Aldan
oils, so the free height is the same on both rates.
Mike
-----Original Message-----
rom: Tony DiGiovanna [mailto:tonydigi at optonline.net]
ent: Monday, August 23, 2010 5:23 PM
o: 'Mike Thomas'; detomaso at realbig.com
ubject: RE: [DeTomaso] Resetting Ride Height With Stiffer Coils
Don't assume the new springs will have the same free height.
hink you are best served to measure the ride height of the car relative to
he ground with the old springs, then change springs and adjust back to
hose settings.
-----Original Message-----
rom: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
ehalf Of Mike Thomas
ent: Monday, August 23, 2010 8:11 PM
o: detomaso at realbig.com
ubject: [DeTomaso] Resetting Ride Height With Stiffer Coils
OK, time for the math wizards to have a head shed . . .
I'm swapping out my front springs from 350 lbs to 450 lbs, and want to
chieve the same ride height.  Since I won't (I assume) get as much spring
ompression with the 450's, I'll need to revise the spring perches on my
ldan shocks.  I'm guessing I'll need to compress them slightly more on the
hock (the collar height up the shock body) since the springs won't drop as
uch when I let the car back down and the springs settle in.  My car is
tock up front with the addition of an aluminum radiator, so probably close
o stock weight on the front wheels.
Any thought on how much more to compress, or notes form someone whose been
here, would be helpful.  Pulling and readjusting or trying to adjust the
ront on the car are both a much bigger PITA than the rears.  I'd like to
ave to do it as few times as possible.
Thanks in advance for your sage advice.
Mike Thomas
ellow '74 L #6328
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