Torsion Bar Recommendation Needed

[zen]

I would like to get some input on what size torsion bars I should go to. Currently my suspension is way too soft in the rear. The car is a bit too low currently and bottoms (and tops) out pretty easy. I would like to stiffen this up quite a bit without going radical.

Here is what I am currently running that impacts the decision to some extent:
'73 standard bug
Koni Reds
Late 944 ali arms
944 spring plates
17x8.5 Boxster rims
24 extra lbs. of a TIV
CSP Cup Brace

If I remember correctly, stock bars are 24mm. Do I go 26, 27, 28 or what? Any confirmation on length and splines is helpful too so I can order them before pulling mine apart. Anyone with the parts I need willing to give a GermanLook.com owner discount is always appreciated.

[Steve C]

Hi

Are you running stock bug or 944 bars? Bugs have 22mm and the basic 944s use 23.5, sames as a type 3. I found the 23.5 bars worked very nice in my old 1302 but I could have gone a little harder.

Steve

[wrenchnride247]

Zen, my bars came from '87 944 (got the whole housing, and parts attached to it) if my memory is right, my 944's are 25.5 mm, and the bug's were 22 mm. I set them next to my old type I bars, and the 944's are the "heavy duty booty " compared to the type I jobs they are the same spline and length. I can jump up and down on the back of my bug, and it's way stiffer than the old ones. It just so happens I know where some are sitting in a large metal basket(you know the place). I might be going there soon for another reason.

[Eliasson]

There is a lot of torosion bars that is avai 924, 944 och 968 från 76 till 95, dessutom finns ett antal varianter ytterligare från eftermarknads företag.
The lenght of torosion bar that can be used is 676 mm för 1302/3.


Bil modell Årsmodell Diameter (mm) Anmärkning Artnummer
924, Typ176-80 22 /L 311 511 115 D
924, Typ1 76-80 22 /R
924S2
944 86-88
82-92 23.5
23.5 /L 944 333 115 00
924S2
944 86-88
82-92 23.5
23.5 /R 944 333 116 00
944S2 89-91 24 /L 944 333 115 01
944S2 89-91 24 /R 944 333 116 01
944,M030 -86 24,5 /L 944 333 103 00
944,M030 -86 24,5 /R 944 333 104 00
944T
S2,M030/M031
758
968 -92
87-

92-95 25.5 /L 951 333 103 30
944T
S2,M030/M031
758
968 -92
87-

92-95 25.5 /L 951 333 104 30

[Eliasson]

Hi
I pushed some wrong buttons before I was ready to send the last message. But here I try again.
I put a list together, with what I found availably torsion bars....

Car model year Dia (mm) Note Art.number
924, Typ1 76-80 22 /L 311 511 115 D
924, Typ1 76-80 22 /R 311 511 115 D

924S2 86-88 23,5 /L 944 333 115 00
944 82-92 23,5

924S2 86-88 23,5 /R 944 333 116 00
944 82-92 23,5

944S2 89-91 24 /L 944 333 115 01
944S2 89-91 24 /R 944 333 116 01

944,M030 -86 24,5 /L 944 333 103 00
944,M030 -86 24,5 /R 944 333 104 00

944T -92 25.5 /L 951 333 103 30
S2,M030 87-
/M031
/758
968 92-95

944T -92 25.5 /L 951 333 104 30
S2,M030 87-
/M031
/758
968 92-95

I use 23,5 mm and lowering angle 12 degrees and that works ok.

[Eliasson]

Hi again
I found that the lenght should be 676mm.
Inner splines 40 and gives a change of 9 degrees
Outer splinses 44 and gives a change of 8º 10,5’.

[Humble]

Zen, I'm running the 944 25.5mm torsion bars which were a good mix of track and street. It's on the tight side for street use but if you autox, hit track days, or frequently drive winding roads the setup is perfect. It never had any problem with my type 4 hanging off the back.

My old track/street setup
72 super
2L type 4
1303 lower control arms
modified 944 struts with kyb gr-2 inserts and eibach 12" 80lb/in. springs
86 944 n/a alu arms
86 944 club sport 25.5mm torsion bars
kyb gas-a-just shocks
6x16 fuchs w/ 205/55R16 potenza s-03
7x16 fuchs w/ 225/50R16 BFG GeForce T/A KD

[OldeFahrt]

I had the same question so I made a shot in the dark. I just put Sway-A-Way 28mm's on thinking they would be super stiff. (aircooled.net) I autocross so I was willing to sacrifice some comfort. No comfort lost. The car now feels solid & firm, no harshness at all. Red Koni's too, on second setting. Magic Carpet. I'm kicking it at the autocross now too. Just what the doktor ordered.