Noteworthy TL chassis enhancements include:
- Suspension tuning to enhance ride comfort while maintaining handling performance
- Front spring rates reduced by 7 percent from 2006 TL
- Shock absorbers and compliance bushing retuned for ride comfort
- Thicker hollow front anti-roll bar and new larger diameter hollow rear anti-roll bar
- New rear subframe bushings for reduced NVH
- Stiffer 17 x 8-inch aluminum-alloy wheels that result in less road noise
- Underbody brake strake to reduce brake fade


Features exclusive to the TL Type-S include:
- Increased damping rates for superior handling
- Rear spring rate increased
- A solid front anti-roll bar and thicker rear anti-roll bar
- Damper mount stiffness increased 400 percent for enhanced response and feel
- Exclusive master cylinder for enhanced brake feel
- Brembo 4-piston front brake calipers
....


FRONT SUSPENSION

The TL front suspension is a double-wishbone system with a rigid stamped steel upper arm and a steel lower arm. The system is functionally related to the systems used on Formula One and Indy Cars, and permits the best combination of road holding, ride quality and packaging for the TL. The system uses coil-over shock absorbers that, unlike strut suspensions, are not stressed suspension members. This reduces suspension friction and improves responsiveness to bumps. Suspension camber gain is maximized through the use of a short upper arm, while steering feel is enhanced through a high placement of the lower arm.

The upper suspension arm is extremely rigid, which makes it less likely to transmit vibrations from road surface irregularities into the cabin as road noise. A special compliance bushing on the lower arm better absorbs bumps and improves ride quality. A steel bar connects the shock towers. Hollow, high-strength and lightweight, it enhances chassis solidity, steering precision and feel.

While the major geometry is shared between the TL and TL Type-S, the tuning of these components results in cars with significantly different steering and ride feel.

The TL's suspension has been retuned with an emphasis on ride comfort while maintaining excellent handling. Thus, the hollow front anti-roll bar has increased in size from 25.4 mm to 27.2 mm. Also, the front spring rate has been reduced by 7 percent compared to the 2006 model. The front compliance bushing and dampers have been retuned for improved ride comfort, resulting in improved ride comfort without increased roll and only a slight decrease in instrumented handling tests.

The Type-S suspension has been retuned for significant performance gains. The hollow front anti-roll bar is replaced with a 27 mm solid bar. Although a smaller diameter than the previous TL, the bar is significantly stiffer than the hollow 27.2 mm bar it replaces. Additionally, the front damping rate has increased significantly. The dampers on the Type-S have been tuned specifically for this vehicle's goal of refined handling. The result is increased road holding and enhanced stability with a reduced roll angle, with a minimal loss in ride comfort. Also, the damper mounts are 400 percent stiffer, improving steering response and handling, but without compromising road noise isolation.


REAR SUSPENSION

The TL rear suspension is a 5-link independent system with struts and coil springs. It mounts to a steel subframe to improve road isolation and provide a quiet interior. The rear suspension geometry adds "toe-in" when the suspension is compressed, improving handling stability over bumps and during hard cornering and braking.

A stabilizer bar further improves handling precision by limiting body roll, while a special "pillow joint" for the lateral links improves camber rigidity. Rubber shims on the leading and trailing arm bushings improve ride comfort.
As on the front suspension, the rear suspension has been specially retuned on both the TL and TL Type-S. The TL has unique shock valving for improved ride comfort. The rear anti-roll bar has been changed from a solid 17 mm bar on the 2006 model to a hollow 18.3 mm bar. This reduces weight without sacrificing roll stiffness.

Type-S suspension settings are tuned for performance. Although the automatic and manual transmission Type-S models have the same suspension settings, the rear spring rate has been increased 33 percent on vehicles equipped with a manual transmission, 14 percent on vehicles mated with automatic transmissions. The solid rear anti-roll bar has increased in size from 17 mm on the 2006 model to 20 mm for 2007 on cars with an automatic transmission. This results in much greater roll stiffness in the rear, allowing for better balance and control.