[DeTomaso] Resetting Ride Height With Stiffer Coils

David & Marilyn Bell davidabell at worldnet.att.net
Wed Aug 25 00:25:06 EDT 2010


I guess I either write or think (or both) upside down.  The new springs
should put the tire 1/2 inch further away from the fender, not closer.

Dave Bell

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of David & Marilyn Bell
Sent: Tuesday, August 24, 2010 6:11 PM
To: detomaso at realbig.com
Subject: Re: [DeTomaso] Resetting Ride Height With Stiffer Coils


OK - I purposely mentioned 'roughly' and 'approximately' to indicate this
was a purely bubba type estimate, though probably I shouldn't have used any
decimal places that may have added some artificial precision.

So, I've got 20 bucks that says the top of the front tire will be about 1/2
inch (plus or minus 1/4 inch) closer to the fender lip with the new 450#
springs than with the previous 350# springs (obviously before moving the
spring perches up or down).

Who's in?

Also be sure to drive the car around to settle the suspension before
measuring the fender to tire gap.


Dave Bell (don't need no stinkin corner weights to go around corners fast)


-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Paul - Home
Sent: Tuesday, August 24, 2010 9:47 AM
To: unlisted-recipients:; no To-header on input
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] Resetting Ride Height With Stiffer Coils


Goran is of course correct and the reason is that springs are not
installed vertically, they are at an angle.

Paul
#9270

Pantdino wrote:
> 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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