Joseph Mills

I'm all ready to order my 21/28mm torsion bars and Bilsteins to prepare for AX season and it appears that 28mm R bars for 87-89 Carreras are NLA!

I can't believe it!

Have I just not found the right supplier? Even looked for hollow bars to no avail. I did find some 22/30's, but I'm afraid those would be too stiff for my intended setup.

Anyone know of a good source I might check?

Or maybe better yet, anyone have some for sale from a later upgrade?

Joseph
88 Carrera
AXhound

69 911E -
75 914-4 -

JackOlsen

Have you tried Elephant Racing? They show them as available.

autobonrun

WM-930-R28 (hollow 29.4mm) have effective rate of 28mm for 1988 911.

http://www.pelicanparts.com/catalog/...SUSshk_pg4.htm

Joseph Mills

Thanks guys!

Autobonrun -
If you look to the right of that listing it reads: No Longer Available


Jack -
I'm going to call Elephant tomorrow and see what they actually have available. As I understand, these are Sanders bars that have been plated and plugged and since Sanders web site list only 29 & 31 for 87-89, I don't have my hopes up too high.

Still looking...

Joseph
88 Carrera
AXhound

69 911E -
75 914-4 -

autobonrun

My apology. I looked down the list but not to the right.

Is there a way to contact Sway-A-Way (weltmeister) directly? Maybe that's an option.

loosecannon

This article on Pelican parts http://www.pelicanparts.com/techarti...rsion_bars.htm
shows that going to 22/30 would make for an unbalanced car because the rear spring rate increase is far more than the front. I found out the hard way because I installed 22/30 bars on my 911SC(which I auto-x) and it made for a twitchy car on anything but perfectly smooth pavement. I also couldn't find 28mm rear bars but found some new 27mm bars on e-bay and now the car feels very nicely balanced over bumps, is almost comfortable on the street but understeers too much. I will be installing 22mm adjustable front and rear sway bars next week and I expect they will solve the understeering issue.

JackOlsen

I wouldn't worry too much about going too stiff with torsion bars. By contemporary standards, even the stiffest available torsions aren't all that crazy stiff. I'll list Wil Ferch's coil spring equivalent spring rate chart below so you can see what I'm talking about.

The 22/28 and 23/31 guidelines are just that. Bruce Anderson acknowledges in his book that a lot of track guys go with much stiffer springs in the rear, relative to the front. I used to run 21/30, per a couple of different suspension experts' recommendations, and the car was still pretty mild. Now I run 600# coil springs in the back of my 911 with 23mm torsion bars in the front, and I stiffen the front shocks as much as possible to make up for the difference, but it's still a flexible, street-driven car. It's not possible to make a torsion bar big enough to equal a 600# spring rate, but passengers are always surprised how compliant my car feels on public roads.

Thanks to Wil Ferch for this data on equivalent spring rates for torsions versus coil springs:

Front Torsion Bars

18.8 mm = 110 lb/in
21 = 173
22 = 210
23 = 250
24 = 296
25 = 350

Rear Torsion Bars

23 mm = 100 lb/in
24 = 120
25 = 140
26 = 165
27 = 191
28 = 221
29 = 254
30 = 294
31 = 332
32 = 377
33 = 427

More complete information is in this PDF file.