[Miata] FM suspension questions

[Larry Alster]

True but I'm not quite understand how you can move an upper perch on a coil
over.  The upper perch on a Miata is a rigid mount to the body, how do you
move the top perch, keep the same spring rate, affect the ride height and
not affect the suspension geometry??  I understand this is not the case with
the GC units but I'm just curious how this would work.

I understand how the units that change the shock body itself work.



Larry
 
White Knight      1991 Crystal White   #99 CSP
Silver Bullet        1992 Silverstone     #17 SM2  FM I+ Turbo
Honey B             1992 Sunburst Yellow #99 SM2L  JR Supercharger
Whooosh           2004 Titanium Mazdaspeed MX-5
 
LowCountry Miata  http://www.lowcountrymiataclub.net
Masters Miata
RAGS 074


-----Original Message-----
From: miata-bounces at realbig.com [mailto:miata-bounces at realbig.com] On Behalf
Of glen mccready
Sent: Saturday, May 10, 2008 4:11 PM
To: glpp2
Cc: miata at realbig.com; Larry Alster; 'Gary Spray'; 'glen mccready'
Subject: Re: [Miata] FM suspension questions

glpp2 wrote:
> I think I'm missing something, also.  To change the load on the spring, 
> don't I have to compress the spring, or change the weight of the car?  If
I 
> move the bottom of the spring up or down and the top of the spring moves
up 
> or down the same amount, thus changing the ride height of the car, how
does 
> this change the load on the spring?

You're not missing anything. If you can move both the upper and
lower perch the same amount, the same direction, the load on the
spring remains constant, spring length remains constant, etc.

If you can move only one perch you're changing the pre-load on
the spring as you adjust ride height.

glen
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