Why the A80 Supra Benefits from Chassis and Tire Upgrades

The Toyota Supra A80 is already an icon—its 2JZ engine and balanced chassis earned it legendary status. But even the best factory build leaves room for improvement, especially in cornering. The stock rubber bushings, mild sway bars, and touring-focused tires are fine for daily driving, but they limit the car’s true potential on twisty roads or track days. Upgrading bushings, sway bars, and tires transforms the Supra into a precise, confidence-inspiring machine. In this guide, we’ll examine each upgrade in depth, covering material choices, installation considerations, and performance outcomes. These changes work together to reduce body roll, sharpen response, and maximize grip—giving you a flat, planted cornering experience.

1. Upgrading Bushings: The Foundation of Suspension Precision

Factory rubber bushings are designed for comfort and noise isolation. Over time they degrade, introducing slop and unpredictable geometry shifts. Replacing them with performance bushings eliminates this play, translating steering inputs directly into suspension movement. The result is faster turn-in, more consistent alignment, and better feedback through the wheel.

Understanding Bushing Roles

Bushings are found in control arms, sway bar links, subframes, and differential mounts. Each location influences handling. For cornering, the front lower control arm (LCA) and rear toe link bushings are most critical. Stiffer bushings here reduce deflection under load, keeping the tires planted.

  • Front LCA bushings – Primary impact on steering feel and caster control.
  • Rear toe arms – Prevent unwanted toe changes during cornering.
  • Front and rear subframe bushings – Reduce chassis flex and alignment shift under heavy cornering.
  • Differential bushings – Minimize drivetrain lash and improve power delivery stability mid-corner.

Polyurethane vs. Delrin vs. Spherical Bearings

The most common upgrade material is polyurethane (PU). It offers a good balance of stiffness, noise reduction, and cost. Delrin and nylon bushings are harder and transfer more vibration, but they provide nearly zero compliance—ideal for track-only cars. Spherical bearings (heim joints) offer the ultimate precision but require regular maintenance and can be harsh on street cars. For a dual-purpose Supra, polyurethane bushings from brands like Suprastore or Driftworks are excellent choices.

Installation and Real-World Benefits

Bushing replacement requires pressing out old rubber and pressing in new inserts. It is labor-intensive but well worth the effort. After upgrading, you will notice sharper steering response, less body lean transition, and greater traction on exit. The car “reads” the road better because deflection is minimized. Many owners report that the car feels lighter on its feet, even though weight hasn’t changed. A proper alignment after bushing replacement is essential—settings that were once masked by bushing compliance will now be accurate.

2. Upgrading Sway Bars: Controlling Body Roll

An anti-roll bar (sway bar) connects left and right suspension, resisting body lean through turns. The A80 Supra’s OE sway bars are adequate for street driving, but they allow noticeable roll under hard cornering, delaying steering response and reducing tire contact patch consistency. A stiffer sway bar drastically flattens the car, keeping both tires working evenly and improving feel.

Thickness and Material

Aftermarket bars are typically 25–30% stiffer than stock, made from hollow or solid alloy steel. A common upgrade is 27 mm front and 22 mm rear bars on the A80. Some kits offer adjustable end-link holes, allowing you to fine-tune front/rear roll stiffness bias. This adjustability is valuable for balancing understeer and oversteer characteristics.

  • Solid bars – Direct stiffness increase; slightly heavier.
  • Hollow bars – Lighter but still significant rigidity; often preferred for weight savings.
  • Pendulum-style adjustable – Offer multiple end-link positions for tuning.

Adjustable sway bars allow you to stiffen or soften the bar by moving the end link attachment point. This is useful if you plan to change driving conditions between street and track. Non-adjustable bars are simpler and less expensive but lock you into one setting. For most enthusiasts, an adjustable rear bar (with two or three settings) provides the best versatility for corner exit traction.

Installation Tips and Alignment

Sway bar installation is straightforward: remove the old bar and end links, transfer or replace bushings, and bolt in the new bar. Use polyurethane sway bar bushings for consistent grip and longevity. After installation, re-check alignment because the stiffer roll couple can alter static suspension geometry. A slight increase in front negative camber (around -2.5 to -3.0 degrees) pairs well with upgraded bars to maximize grip in corners.

Professional installation is recommended if you lack a lift or torsion wrench. Brands like Whiteline and Hotchkis manufacture dedicated Supra sway bar kits.

3. Upgrading Tires: The Only Contact Patch

No matter how stiff your bushings and sway bars are, the tire is what interfaces with the asphalt. Factory A80 tires (235/45R17 front, 255/40R17 rear) are designed for balanced touring. Modern ultra-high-performance (UHP) summer tires like the Michelin Pilot Sport 4S, Bridgestone Potenza RE-71RS, or Toyo Proxes R1R provide drastically more lateral grip, faster warm-up, and consistent feel.

Selecting the Right Tire for Cornering

When upgrading for cornering, prioritize tires with high treadwear ratings (200–300) for street use or extreme performance summer tires (200-treadwear) for track days. Pay attention to sidewall stiffness; a stiffer sidewall reduces tread squirm and improves steering feedback. For staggered fitments, some owners go to square setups (255mm all around) to increase front grip and reduce understeer.

  • 225/45R17 or 235/45R17 front – Good for moderate power on street.
  • 255/40R17 or 275/40R17 rear – Matches stock width for optimal contact patch.
  • 275/35R18 / 315/30R18 – Common for wider track wheels; provides huge grip.
  • Tire temperature range – Summer tires need warm pavement; all-season tires sacrifice ultimate grip.
  • Wear characteristics – Softer compounds wear faster but offer maximum stickiness.

Matching Tires to Upgraded Suspension

With stiffer bushings and sway bars, the suspension geometry becomes more responsive. A tire that was adequate on a soft car may now feel vague because the chassis transmits more forces. Upgrading to a tire with a stiffer carcass and better shoulder support (e.g., Hankook Ventus R-S4 or Yokohama Advan A052) will synchronize the chassis improvements. Don’t neglect tire pressure: start at 32–34 psi cold for street use, and adjust based on contact patch wear after a session.

Wheel Size and Offset

Your tires must fit within the wheel wells and clear the brakes. Common aftermarket wheel sizes for the A80 are 17x9” front and 17x9.5” rear, or 18x9.5” front and 18x10.5” rear. Using an offset in the range of +20 to +30 mm will keep the tires centered in the fender. Too much offset can cause rubbing during cornering; too little may hit the strut. After mounting new tires, have the alignment set with a focus on camber (front: -2.5° to -3.0°, rear: -1.5° to -2.0°) and toe (slight toe-in at the rear for stability).

4. Synergizing Bushings, Sways, and Tires

These three upgrades amplify each other. Stiff bushings reduce deflection, allowing the sway bar to work more effectively. The flat cornering from the sway bars lets the tires operate at optimal slip angles. In turn, better tires give the driver confidence to exploit the tighter chassis. Without all three, you might find that one component overwhelms another—for example, very stiff sway bars on stock bushings can introduce unwanted flutter, or sticky tires on soft bushings can cause unpredictable camber changes mid-corner.

When planning your build, install bushings first, then sway bars, then tires. This sequence lets you evaluate handling changes at each step. After the full set is installed, fine-tune with alignment and possibly corner weighting to balance left/right and front/rear grip.

5. Additional Considerations for Ultimate Cornering

While bushings, sway bars, and tires are the foundation, you may also consider companion upgrades:

  • Adjustable coilovers (e.g., KW V3, Ohlins DFV) – Allow fine-tuning of damping and ride height to complement the stiffer chassis.
  • Reinforced differential mount – Reduces wheel hop on corner exit.
  • Aftermarket tie rods and steering rack – Eliminate play in the steering system.
  • Corner balancing – Equalizes weight across all four corners, crucial for consistent turn-in.
  • Brake upgrade – With sharper cornering you may need more fade resistance; consider ducting or higher-performance pads (e.g., Ferodo Racing).

Remember that handling modifications should be driven by your usage. A street-focused car requires different compromises than a dedicated track car. The beauty of the A80 Supra is its ability to adapt – with the right selection of bushings, sway bars, and tires, you can tailor it to your driving style without losing daily civility.

Final Thoughts: Building a Cornering Machine

The A80 Supra has earned its reputation not only for straight-line speed but also for balanced chassis dynamics. By upgrading bushings to increase precision, sway bars to control roll, and tires to maximize grip, you unlock its cornering potential. The result is a car that responds predictably and eagerly to steering inputs, whether you are attacking a back road or lapping a circuit. Each of these components is a proven, bolt-on improvement that requires no major fabrication yet delivers a dramatic transformation. Start with the bushings, add sway bars, and finish with high-performance tires—then enjoy a Supra that handles as well as it looks.

For further reading, check detailed installation guides at SupraForums or product reviews at ToyotaNation. The aftermarket for the A80 is deep and supportive, so you are never far from the exact part you need. Invest in your chassis, and your Supra will reward you mile after mile.