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SAS is 22mm, Abbott Racing is 18 or 20mm?.....
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Posted by REM in Seattle (more from REM in Seattle) on Tue, 30 Sep 2003 09:41:58 Share Post by Email
In Reply to: Thanks!, MisplacedYankee [Profile/Gallery] , Tue, 30 Sep 2003 08:25:53
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From Saab Press Release -

Twist-Beam Rear Axle

�The new Saab 900 rear axle is designed to provide dynamic roll oversteer, which Saab engineers believe gives better straight-line stability and more positive turn-in control than roll understeer. This makes the Saab 900 more responsive, and at the same time more damped in its directional movements--it's a characteristic that has been a fundamental part of the Saab handling philosophy for many years.�

�The H-shaped axle side arms are of a heavy gauge metal, and additional welds reinforce the assembly. This design is lighter than its predecessor and provides more longitudinal compliance, to further improve ride comfort. The front ends of the side arms are connected to the body through large-diameter, well-tuned rubber bushings, with direct-acting compact, taper-wound coil springs. Separate gas-pressurized telescopic shock absorbers are attached behind the wheel hubs, while maintenance-free wheel bearings are mounted inside welded hub carriers.�

�For fine-tuning the roll stiffness at the rear, a separate stabilizer bar is mounted inside the open-channel cross tube of the rear axle assembly, with a second stabilizer bar bolted externally behind. Extra plates are welded to the rear axle mounts to improve lateral stiffness.�


So the sway bar being replaced is only one of two sway bars that make up the Saab rear axle assembly. The stock rear sway bar on my 1998 900SET was 15mm in diameter. The formula for torsional stress says that, all other dimensions being equal, the force from the bar is proportional to the diameter of the bar raised to the 4th power (D2/D1)4. So if the stock 15mm diameter bar is set as the baseline, an 18mm diameter bar will be 107% stiffer, a 20mm diameter will be 216% stiffer, and the 22mm diameter bar is about 363% stiffer than the stock 15mm diameter bar.

Rob Mustard (aka REM in Seattle)
1998 Saab 900SE Turbo, Silver, 5-door, Automatic Transmission
UPGRADES -
ENGINE
·SpeedParts �Step 2� Engine Control Unit (ECU).
·Saab stainless steel sport exhaust with added center resonator.
·Forge piston type boost pressure by-pass/diverter valve.
·3� inlet tube to factory airbox with ITG performance foam air filter.
·Smoothed/ported throttle body transition casting and removed turbocharger outlet tube �silencer�.
·Thermo-Tec �Thermo Shield� insulated intercooler inlet and outlet tubes.
SUSPENSION
·205/55-WR16 Dunlop SP Sport 5000 tires.
·Swedish Auto Specialties 22mm (7/8�) rear anti-sway bar.
·Koni Sport adjustable front struts and rear shock absorbers.
·Abbot Racing polyurethane tracking control arm bushings.
·Abbott Racing steering rack brace.
LIGHTING
·European E-code headlights with Philips �VisionPlus� halogen 60/55 watt H4 bulbs.
AUDIO
·Infinity Kappa speakers � Model 32.1cf 3.5� 2-way speakers in the dash, Model 693.1i 6�x9� 3-way speakers in the rear parcel shelf, and Model 65.1mb 6.5� mid-bass speakers in the front doors.
·Dynamat �Super� & Dynamat �Premium� sound deadening material in doors and rear cargo area.





posted by 208.49.241...


->Posting last edited on Fri, 26 Apr 2013 14:16:14.
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