[Shotimes] Eibach springs with stock struts?

[Dave Garber]

But wouldn't the rears be proportionately the same? In other words, if
the front springs are rated higher due to the increased weight of the
engine, shouldn't the struts dampening also be rated 'higher'? I mean, I
would think that along this line of logic that the rears may indeed be a
'lighter' spring, but the strut should also be equally 'lighter' in it's
dampening. Conversely, the front springs are rated higher, so the struts
would be too.

Are the stock front springs rated higher than the stock rear springs? If
so, I guarantee you that the struts are rated to match their respective
springs. Further, the KYB's, as a stock replacement, should be the same
way. And the Eibach's should also be the same, with the fronts stiffer
than the rears. So, since the rear rides perfectly fine, why doesn't the
front? Bad struts? Defective from the factory? Different rating due to
being built in a different country (the fronts are China, the rears
Italy)?


Dave Garber




-----Original Message-----
From: Ian Fisher [mailto:dataflash@yahoo.com] 
Sent: Friday, February 25, 2005 1:39 PM
To: Dave Garber; leahyz@gmail.com; shotimes@autox.team.net
Subject: RE: [Shotimes] Eibach springs with stock struts?

I don't have the coil ratings in front of me but I would imagine that
the front springs are rated much higher to accomodate all of the weight
up front as opposed to the rears. ie, the rear springs are naturally
softer because most of the weight in the Taurus is up front.

I've seen this happen before on other cars, Hondas, SHO's, etc. People
install higher rate springs but the OE or OE style strut isn't valved to
handle the spring.  As a result, the car bounces over everything.

Ian


--- Dave Garber <dgarber@servicelinklp.com> wrote:

> Then why doesn't the rear act the same way? The rear of the car rides 
> great - whether I have two 230lbs+ adults back there, or whether I 
> have no one back there. It's just the front.
> 
> I've replaced springs in other cars I've owned without changing 
> shocks/struts and never experienced this school bus bouncy ride 
> before.
> Sure, the ride gets stiffer, but never bouncy like this thing.
> 
> 
> Dave Garber
> 
> 
> 
> 
> 
> 
> 
> > Ah, spring-mass-damper systems...  
> > 
> > ya'll take differential equation in college?
> > 
> > it's a second order (ax'+bx+c=0) system and you
> are changing some of
> > the terms by changing the springs.  Particularly
> you have affected the
> 
> > 'b' term in the equation.  Now, without having
> real numbers to work
> > with, I would say that you probablt don't want to
> make b larger
> > without making a larger as well.
> > 
> > In real world terms, the spring creates more force
> now, and the
> > dampener (if as stiff, or potentially less) cannot
> counter the higher
> > foces (bx) that the spring generated.  the end
> result is an
> > ocillation, and a quesy feeling, and jokes about
> hydraulics.  I would
> > say that you need to increase the dampener effect
> in front.  I think a
> 
> > good approach would be to look at how stiff these
> are compared to what
> 
> > came out, and what possiblilites you have, and
> then select something
> > with better damping force.
> > 
> > Z
> > 
> > PS, i use an eibach/tokico setup on all 4 corners
> and find it quite
> good.
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