C4/Type 44 Suspensions-LONG

[Erik R Addy <erik@aero.und.edu>]

Well, I have been doing some research on springs for the type 44
chassis, and have come up with a little info, and a lot of questions!
I am posting this to the S-Car list as some of the spring info 
applies to them.

Background:
I am seeking info on springs I could use on my '89 200tq that are at
_least_ as stiff as the ones I currently run (H+R 29800-listed for
'91 200tq 20v), yet not lower the car as much (about 50mm front and
60mm rear- I would like to reduce that by 20-30mm).  I spoke to H+R
and Eibach, I have not gotten any info back from Apex or Intrax.

Info:
Eibach claims their springs are linear in the front, progressive in the
rear.

Model		Application	Front rate	Rear rate

1506.140	Type 44		128		128-286

1528.140	C4		"Not in my computer yet"
	
H+R says their springs are "mildly progressive", meaning that they are
progressively wound, but most of that is just to create the "dead
coils", and that once the springs are installed/loaded, they are almost
linear in their "working rate"

Model		Application	Front rate	Rear rate
29616		10v Type 44	180		230

29800		20v Type 44	180		270

29826.1/.2	A6 FWD		180		230

29828		S6		185		235

29921		V8		290		330

29771		S6+		345		330

>From the looks of it, the A6fwd and S6 spring might work pretty well in
my 200tq.  What is the difference between them?  The rates are nearly
the same, so my guess is the S6 springs are taller (i.e., set up for
higher vehicle weights).  How much higher would these springs make my
200tq than the 20v springs?  Would they preserve the tail-down rake?
How about the V8 springs?  For the S-car guys, it looks like the V8 or
S6+ springs might indeed be the way to go.  One thing I wonder about is
the front/rear stiffness ratio.  The V8 springs are 57% stiffer in the
front, and only %40 stiffer in the rear.  The S6+ springs are +%86/40.
Might either of these springs bias the car (either my 200 or the S-cars)
too much towards understeer?  Of course, with the recent anti-roll bar/
camber gain discussions, perhaps not?

Additional questions:
1)How much higher can I expect Bilseins to raise the car v Boge TG?

2)Do Bilsteins really increase the effective spring rate (I have heard
about 50lbs)?

3)What are the oem spring rates (200tq 10v, pre and post-92 S4)?

Thanks in advance,
Erik
erik@aero.und.edu